Обзор

3WL5 air circuit breakers/non-automatic air circuit breakers acc. to UL 489/IEC 60947-2 up to 5000 A (AC)

Область применения

• As incoming-feeder, distribution, tie, and outgoing-feeder circuit breakers in electrical installations
• For switching and protecting motors, capacitors, generators, transformers, busbars and cables.

Due to the reinforced use of electronic control systems, the demands made on air circuit breakers in terms of operator control and monitoring of network processes have increased.

The extensive, coordinated SENTRON range of devices covers all applications between 16 A and 5000 A with compact and open circuit breakers.

Standards

SENTRON 3WL5 circuit breakers comply with:

• UL 489
• IEC 60947-2
• DIN VDE 0660 Part 101
• Climate-proof according to IEC 60068-2-30.

Особенности

Low space requirements

The SENTRON 3WL5 devices require very little space. Size I devices (up to 1600 A) fit into a 400 mm wide switchgear panel. Size III devices (up to 5000 A) are the smallest of their kind and with their construction width of 704 mm fit into a 800 mm wide switchgear panel.

Modular design

Components like auxiliary trip units, motorized operating mechanisms, electronic trip units, current sensors, auxiliary circuit signaling switches, automatic reset devices and interlocks can all be exchanged or retrofitted at a later stage, thus allowing the circuit breaker to be adapted to new, changing requirements.

Retrofittable modules for electronic trip units

Modularity is one of the main features of the new SENTRON 3WL circuit breakers. Special LCDs, ground-fault modules, rated current modules and communications modules for the electronic trip units are available for fast and easy retrofitting and adaptation to changing requirements.

Communication

The use of modern communication-capable circuit breakers opens up completely new possibilities in terms of start-up, parameterization, diagnostics, maintenance and operation. This allows many different ways of reducing costs and improving productivity in industrial plants, buildings and infrastructure projects to be achieved.

• Timely information and response can prevent plant stoppages
• Effective diagnostics management
• Measured values are the basis for efficient load management, for drawing up power demand profiles and for assigning energy to cost centers
• Preventive maintenance reduces the risk of expansive plant down-times

Дизайн

Versions

• Rated currents: 630 A to 5000 A
• 3 sizes for different rated current ranges
• 3-pole version,
  4-pole version on request
• Rated operational voltage up to 600 V AC
• 2 different switching capacity classes in the range from 65 kA to 100 kA at 480 V AC.

The SENTRON 3WL5 circuit breakers are supplied complete with operating mechanism (manual operating mechanism with mechanical closing), electronic trip unit and auxiliary switches (2 NO contacts + 2 NC contacts in the standard version), and can be equipped with auxiliary trip units.

Installation types

Fixed-mounted or withdrawable version

Ambient temperatures

The SENTRON 3WL5 circuit breakers are climate-proof according to IEC 60068-2-30. They are intended for use in enclosed areas where no severe operating conditions (e.g. dust, corrosive vapors, damaging gases) are present.

When installed in dusty and damp areas, suitable enclosures must be provided.

Coordinated dimensions

The dimensions of SENTRON 3WL5 circuit breakers only differ in terms of the width of the device which depends on the number of poles and the size.

Due to the nature of the design, the dimensions of devices with a withdrawable version are determined by the dimensions of the guide frames, which are slightly larger.

Non-automatic air circuit breakers

One special version of circuit breaker is utilized as a non-automatic air circuit breaker. The non-automatic air circuit breakers are designed without an electronic trip unit system and do not perform any protection duties for the system.

One potential application is the use as a bus coupler in systems with parallel feed-ins.

The versions and features can be selected according to those of the circuit breakers.

Operating mechanisms

The circuit breakers are available with various optional operating mechanisms:

• Manual operating mechanism with mechanical closing (standard design)
• Manual operating mechanism with mechanical and electrical closing
• Motorized operating mechanism with mechanical and electrical closing.

The operating mechanisms with electrical closing can be used for synchronization tasks.

Main circuit connections

Main circuit connections – connection types
Fixed-mounted circuit breaker
Horizontal connection	Front connection with single hole or double hole		Vertical connection
Withdrawable circuit breaker, withdrawable guide frame
Horizontal connection	Vertical connection	Flange connection

All circuit breakers are equipped with horizontal main circuit connections on the rear for up to 5000 A as standard (horizontal connection to busbars).

The following options are available, with all combinations of top and bottom connections possible:

• Accessible from the front, single hole (for vertically installed busbars, only for fixed mounting)
• Accessible from the front, double hole (holes according to DIN 43673) (for vertically installed busbars, only for fixed mounting)
• At the rear, vertical (for vertically installed busbars)
• Connecting flange (for direct connection to guide frame up to 4000 A).

Auxiliary circuit connections

Connection options for auxiliary circuit connections
Connection using screw connection system (SIGUT) (standard)	Screwless connection method (tension springs) (optional)

The type of connection for the auxiliary switches depends on the type of installation:

• Withdrawable version
  The internal auxiliary switches are connected to the male connector on the switch side. When fully inserted, the connector makes a connection with the sliding contact module in the guide frame. Various adapters can then be used to complete the wiring.
• Fixed mounting
  In this case the auxiliary supply connectors are engaged directly onto the circuit breaker. The connectors are equipped with coding pins that prevent them being mistakenly interchanged.

Operator panel

The operator panel is designed to protrude from a cut-out in the door providing access to all control elements and displays with the control cabinet door closed. The operator panels for all circuit breakers (fixed-mounted/withdrawable versions, 3-/4-pole) are identical. The operator panel ensures degree of protection IP41.

Safety and reliability

To protect the circuit breakers and plant against unauthorized switching as well as the maintenance and operator personnel, the system contains many blocking devices. Others can be retrofitted.

Other safety features include:

• Infeed from above or below, as required
• Locking of the guide frame with the circuit breaker removed, as standard
• Locking of the withdrawable circuit breaker against movement, as standard
• High degree of protection with cover (enclosure rating)
• Mechanical closing lockout after overload or short-circuit tripping as standard
• The circuit breaker is always equipped with the required number of auxiliary supply connectors.

Standard versions

SENTRON 3WL5 circuit breakers are equipped with the following features as standard:

• Mechanical ON and OFF pushbutton
• Manual operating mechanism with mechanical closing
• Switch position indicator
• Ready-to-close indicator
• Memory status indicator
• Auxiliary switch 2 NO + 2 NC
• Rear horizontal main circuit connections for fixed-mounted and withdrawable versions up to 5000 A
• For 4-pole circuit breakers, the fourth pole (N) is installed on the left and is 100 % loadable with the rated current
• Contact erosion indicator for the main contacts
• Auxiliary circuit plug-in system with SIGUT screw terminals
  Delivery inclusive of all auxiliary circuit connectors to internal features including coding device for the prevention of incorrect installation of auxiliary supply connectors for fixed-mounted circuit breakers
• Mechanical "tripped" indicator for electronic trip unit system
• Mechanical closing lockout after tripping operation
• Operator panel cannot be taken off with the circuit breaker in the ON position

Additional features of the withdrawable version:

• Main contacts:
  Laminated receptacles in the guide frame, penetration blades on the withdrawable circuit breaker
• Position indicator in the operator panel of the withdrawable circuit breaker
• Captive manual crank handle for moving the withdrawable circuit breaker
• Guide frame with guide rails for easy moving of the withdrawable circuit breaker
• The withdrawable circuit breaker can be locked to prevent it being pushed out of position
• The withdrawable circuit breaker cannot be moved when it is in the ON position
• Coding of the rated current between the guide frame and the withdrawable circuit breaker.

Standards

SENTRON 3WL5 circuit breakers comply with:

• UL 489
• IEC 60947-2
• DIN VDE 0660 Part 101
• Climate-proof according to IEC 60068-2-30.

Auxiliary trip units

Up to two auxiliary trip units can be installed at the same time. The following are available:

1 shunt trip unit
or 1 undervoltage trip unit
or 2 shunt trip units
or 1 shunt trip unit
+ 1 undervoltage trip unit.

Signal switch for auxiliary trip units

One signaling contact is used for each auxiliary trip unit to determine the positions of the auxiliary trip units.

Shunt trip units

When the operational voltage is connected to the shunt trip unit, the circuit breaker is opened immediately. The shunt trip unit is available in the versions 5 % OP for overexcitation and 100 % OP for permanent excitation. This means that it is also possible to block the circuit breaker against being jogged into closing.

An energy storage device for shunt trip units allows the circuit breaker to be opened even if the control voltage is no longer available.

Undervoltage trip units

The undervoltage trip unit causes the circuit breaker to be opened if the operational voltage falls below a certain value or is not applied. The circuit breaker cannot be closed manually or by means of an electrical ON command if the undervoltage trip unit is not connected to the operational voltage. The undervoltage trip unit has no delay as standard. A delay can be set by the customer in the range between t_d < 80 ms and t_d < 200 ms.

In addition, an undervoltage trip unit with a delay in the range from 0.2 to 3.2 s is available.

Closing solenoid

The closing solenoid is used to close the circuit breaker electrically by means of a local electrical ON command or by a remote unit.

Motorized operating mechanisms

The operating mechanism is used to load the storage spring automatically.

The operating mechanism is activated if the storage spring has been unloaded and the control voltage is available.

It is switched off automatically after loading. This does not affect manual operation of the storage spring.

Indicators, signals, and control elements

Motor shutdown switch

Control switch for switching off the motorized operating mechanism (automatic loading).

Operating cycles counter

The motorized operating mechanism can be supplied with a 5-digit operating cycles counter. The display is incremented by "1" as soon as the storage spring is fully loaded.

Resetting the manual tripped signal

When the circuit breaker has tripped, this is indicated by the protruding mechanical tripped indicator on the ETU. When the mechanical tripped indicator is activated, the tripping solenoid and tripped signal are reset. If this display is to be reset remotely, the reset button can be equipped with a reset solenoid.

This option allows the circuit breaker to be reset both manually and electrically.

Automatic resetting of closing lockout

When the ETU is activated, reclosing of the circuit breaker is prevented until the trip unit is either electrically or manually reset. If the "Automatic resetting of closing lockout" option is used, the pre-tensioned circuit breaker is ready to close immediately after tripping. Resetting the manual "tripped" indicator is not included in this option.

Tripped signal switch

If the circuit breaker has tripped due to an overload, short-circuit, ground fault or extended protection function, the tripped signal switch can indicate this. This signal switch is available as an option. If the circuit breaker is used for communication, this option is supplied as standard.

Ready-to-close indicator switches

The SENTRON 3WL5 circuit breakers are equipped with an optical ready-to-close indicator as standard. In addition, the ready-to-close status can be transmitted by means of a signal switch as an option. If the switch is used for communication, the signal switch is supplied as standard.

Circuit breakers

Guide frames

Locking devices

Locking device in OFF position

This function prevents closing of the circuit breaker and complies to the specifications for main switches according to EN 60204 (VDE 0113) and UL489 - disconnector unit. This lockout only affects this circuit breaker.

If the circuit breaker is replaced, closing is no longer prevented unless the new circuit breaker is also protected against unauthorized closing.

To activate the locking device, the circuit breaker must be opened. The locking device is disabled when the circuit breaker is closed. The lock is only activated when the key is removed. The safety key can be removed only in the "OFF" position.

Locking device for "Electrical ON"

This prevents unauthorized electrical closing from the operator panel. Mechanical closing and remote closing remain possible. The lock is only activated when the key is removed.

Locking device for "Mechanical ON"

This prevents unauthorized mechanical closing. The mechanical ON button can only be activated if the key is inserted (key operation). Closing with the "Electrical ON" button and remote closing remain possible. The lock is only activated when the key is removed.

"Secure OFF" circuit breaker-independent locking device against unauthorized closing

This special switch-independent function for withdrawable circuit breakers prevents closing and fulfills the specifications for main switches to EN 60204 (VDE 0113) and UL 489 – disconnector unit. Unauthorized closing remains impossible even after the circuit breaker has been exchanged.

To activate the lock, the circuit breaker must be opened. The locking device is disabled when the circuit breaker is closed. The lock is only activated when the key is removed. The safety key can be removed only in the "OFF" position.

Locking device for crank handle

Prevents removal of the crank. The circuit breaker is protected against movement. The lock is only activated when the key is removed.

Locking device for "Mechanical OFF"

Prevents unauthorized mechanical opening from the operator panel. The "Mechanical OFF button" can only be activated if the key is inserted (key operation). Remote opening remains possible. The lock is only activated when the key is removed.

Locking device for hand-operated lever

The hand-operated lever can be locked with a padlock. The storage spring cannot be loaded manually.

Locking device against resetting the "tripped" indicator

A lockable cover prevents manual resetting of the "tripped" indicator after overcurrent tripping. This locking device is supplied together with the transparent cover for electronic trip units.

Sealing devices

Sealing cap for "Electrical ON" button

The "Electrical ON button" is equipped with a sealing cap as standard.

Sealing cap for "Mechanical ON" and "OFF" button

The locking set contains covering caps which can be sealed.

Sealing device for electronic trip units

The transparent cover can be sealed. The parameter setting sections are covered to prevent unauthorized access. Openings allow access to the query and test button.

Locking devices

Locking device against movement of withdrawable circuit breakers when the control cabinet door is open

The crank handle is blocked when the control cabinet door is open and cannot be removed. The withdrawable circuit breaker cannot be moved. The lock only affects the inserted crank handle.

Locking of the control cabinet door

The control cabinet door cannot be opened if

• the fixed-mounted circuit breaker is closed (the blocking signal is transmitted via the Bowden wire) or
• the withdrawable circuit breaker is in the connected position.

Blocking mechanism using "Mechanical ON" and "OFF" buttons

The "Mechanical ON" and "OFF" buttons are covered with a cap which only allows actuation with a tool. These covering caps are part of the locking set.

Optional equipment for guide frames

Shutters

The sealing strips of the shutter seal the laminated contacts of the guide frame when the withdrawable circuit breaker is removed and therefore implement touch protection.

The sealing strips can be manually opened using the strip levers.

The position of the sealing strips can be locked in various positions using padlocks for securing against tampering.

Rated current coding unit between circuit breaker and guide frame

Withdrawable circuit breakers and guide frames are equipped with a rated current coding unit as standard.

This ensures that only circuit breakers whose penetration blades are suited to the laminated contacts of the guide frame can be inserted into a guide frame.

Equipment-dependent coding

Withdrawable circuit breakers and guide frames can be retrofitted with an equipment-dependent coding unit.

This allows different designs of circuit breakers and guide frames to be uniquely assigned. If the circuit breaker and guide frame have been assigned different codes, the circuit breaker cannot be moved in.

36 different coding options can be selected.

Position indicator switches for guide frames

The guide frame can be equipped with position indicator switches. These can be used to determine the position of the circuit breaker in the guide frame.

Two versions are available:

Option 1
Connected position 1 CO contact,
test position 1 CO contact,
disconnected position 1 CO contact

Option 2
Connected position 3 CO contacts,
test position 2 CO contacts,
disconnected position 1 CO contact

Positions of the withdrawable circuit breaker in the guide frame

	Display	Position indicator	Main circuit	Auxiliary circuit	Control cabinet door	Shutters
Maintenance position			Disconnected	Disconnected	Open	Closed
Disconnected position			Disconnected	Disconnected	Closed	Closed
Test position			Disconnected	Connected	Closed	Closed
Connected position			Connected	Connected	Closed	Open

Phase barriers

The plant engineering company can manufacture phase barriers made of insulating material for the arcing fault barriers. The rear panel of the fixed-mounted circuit breakers or guide frames are equipped with guide grooves.

Arc chute covers

The arc chute cover is included as standard in orders with guide frame. It protects switchgear components which are located directly above the circuit breaker.

Door sealing frame and cover

SENTRON 3WL5 circuit breakers have degree of protection IP20 as standard. However, if the switchgear is to be equipped with a higher degree of protection, a door sealing frame with IP41 and a cover with IP55 are available.

Функции

Functions of the electronic trip units

		ETU25B	ETU45B
Basic protection functions
Overload protection	L	✓	✓
Short-time delayed short-circuit protection	NO	✓	✓
Instantaneous short-circuit protection	I	✓	✓
Neutral conductor protection	N	--	✓
Ground-fault protection	G	--	❑
Additional functions
N-conductor protection can be switched on/off		--	✓
N-conductor protection adjustable		--	✓
Instantaneous short-circuit protection can be switched on/off		--	✓
Instantaneous short-circuit protection can be switched on/off		--	✓
Thermal image can be switched on/off		--	✓
Load monitoring		--	✓
Short-time delayed short-circuit protection switchable to I2t		--	✓
Instantaneous short-circuit protection adjustable		--	✓
Overload protection switchable to I4t		--	✓
Overload protection can be switched on/off		--	--
Selectable parameter sets		--	--
Parameterization and display
Parameterization through rotary coding switches (10 steps)		✓	✓
Parameterization through communication (absolute values)		--	--
Parameterization through user interface of ETU (absolute values)		--	--
Parameterization of the extended protection functions		--	❑
LCD alphanumerical		--	❑
Graphic LCD		--	--
Measurement function
Measurement function Plus		--	❑
Communication
CubicleBUS		--	✓
Communication through PROFIBUS DP		--	❑
Communication through MODBUS		--	❑
Communication through Ethernet		--	❑

✓ Standard

-- Not available

❑Optional

Electronic trip units (ETU)

The electronic trip unit is controlled by a microprocessor and operates independently of an auxiliary voltage. It enables systems to be adapted to the different protection requirements of distribution systems, motors, transformers and generators.

Communication capability

The international standard PROFIBUS DP or MODBUS can be used to transmit data such as current values, switching states, reasons for tripping etc. to central computers.

Data acquisition and energy management are possible in conjunction with the Plus measurement function.

A new internal circuit breaker data bus allows switchboard panel communication between the circuit breaker and secondary devices in the circuit breaker panel:

• Actuation of analog displays
• Facility to test the communication build-up with circuit breakers
• Display of tripping status and tripping reasons
• Input module for reading in further switchgear panel signals and for transmission of these signals to the PROFIBUS DP or MODBUS
• Various output modules for displaying measured values.

This means that it is not only possible to monitor the device remotely, but also to transmit current values from the entire system and perform switching operations remotely.

I ² t and I⁴t characteristic curve for overload protection

The best protection for the whole switchgear is achieved by setting the tripping characteristic curve to an optimum value. In order to achieve optimal discrimination for upstream fuses or medium voltage protection systems, the inclination of the characteristic curve can be selected for the overload range.

The overload protection L (long time protection) for the electronic trip units ETU45B allows the characteristic curve to be switched between I²t- and I⁴t.

The I⁴t characteristic improves discrimination for downstream circuit breakers and fuses.

Electronic trip units ETU

Modularity has also been strictly emphasized during the development of the electronic trip units. These are some of the modules which can be easily retrofitted at any time:

• Ground-fault protection module
• Communication
• Measurement function
• Displays
• Rated current module (Rating Plug)

This allows quick adaptation to new local mains specifications. In addition, innovative functions have been included in the ETUs.

Rated current module/Rating Plug

The rated current module is an exchangeable module which allows the user to reduce the rated device current so as to adapt it optimally to the plant; e.g. if a new plant section is taken into operation. The rated current module must be selected to fit the rated current of the plant.

ETU25B electronic trip unit

Application:

Classical building, motor and system protection with time-selective coordination for up to 5000 A

Features:

• Adjustable overload protection with I²t characteristic curve with delay time t_R = 10 seconds at 6 × I_R
• Short-time delayable short-circuit protection adjustable in the range 1.25 ... 12 × I_n and
• Instantaneous short-circuit protection preset to 20 × I_n/max. 50 kA
• Can be adapted at any time to the required plant currents through retrofittable rated current module for ensuring overload protection in the range from 100 A to 5000 A.
• Overload display
• Indicates the reason for tripping by means of an LED
• Test facility for the trip unit
• Protection function is set by means of the rotary coding switch

ETU45B electronic trip unit

Application:

Low-cost all-round system for intelligent buildings and all types of industrial applications – "CubicleBUS integrated"

Features:

The same as ETU25B but also

• Adjustable time-lag class for overload protection
• Selectable characteristic for overload and short-delayed short-circuit range (current discrimination) for more accurate discrimination adaptation to upstream fuses and protective devices
• Thermal image as restart protection for tripped motor outgoing feeders
• Reversible and adjustable neutral conductor protection
• Modular ground-fault protection module with alarm and tripping functions which can be adjusted separately
• Communication interface, measurement function Plus, optional connection of external modules or for retrofitting
• Storage of events and causes for tripping for detailed fault analysis
• Extended protection function possible with measurement function
• Optional high-contrast display with viewing angle adjustment option
• The protection functions can be set by means of a rotary coding switch or slide switch

Ground-fault protection

Ground-fault releases "G" sense fault currents that flow to ground and that can cause fire in the plant. Multiple circuit breakers connected in series can have their delay times adjusted so as to provide graduated discrimination.

When setting the parameters for the electronic trip unit it is possible to choose between "alarm" and "trip" in the event that the set current value is exceeded. The reason for tripping is indicated by means of an LED when the query button is activated.

The ETU45B electronic trip unit version can be retrofitted with a ground-fault protection module.

Measurement method

Vectorial summation current formation

The three phase currents and the N-conductor current are measured directly.

The electronic trip unit determines the ground-fault current by means of vectorial summation current formation for the three phase currents and the N conductor current.

Direct measurement of the ground-fault current

A standard transformer with the following data is used for measurement of the ground-fault current: 1200 A/1 A, Class 1 (the internal load of SENTRON 3WL5 is 0.11 Ω). The transformer can be installed directly in the grounded neutral point of a transformer.

It is also possible to use a summation current transformer.

Setting

How the module is set depends on the measurement method used (see above):

Measurement method 1: In position "Sum I"
Measurement method 2: In position "g".

Ground-fault protection with I²t characteristic curve

All versions of the ground-fault modules are supplied with an I²t characteristic curve which can be activated.

Selection criteria for SENTRON 3WL5 circuit breakers

Basic criteria for selecting circuit breakers are:

• Max. short-circuit current at place of installation of circuit breaker I "_k max.
  This value determines the short-circuit breaking capacity or short-circuit current carrying capacity of the circuit breaker.
• It is compared with the value I_CU, I_CS, I_CW of the circuit breaker and essentially determines the size of the circuit breaker.
• Rated current I _n which is to flow through the branch circuit. This value must not be larger than the maximum rated current for the circuit breaker.
  The rated current for the SENTRON 3WL5 is set with the rated current module.
• Ambient temperature
  for the circuit breaker
  This is usually the control cabinet internal temperature.
• Design of the circuit breaker
• Minimum short-circuit current
  which flows through the switching device. The trip unit must still detect this value as a short-circuit and must respond by tripping.
• Protection functions of the circuit breaker.
  These are determined by the selection of the corresponding electronic trip unit.

Конфигурация

Mutual mechanical circuit breaker interlocking

The module for mutual mechanical interlocking can be used for one or two SENTRON 3WL5 circuit breakers and can be adapted easily to the corresponding versions. The fixed-mounted and withdrawable circuit breaker versions are fully compatible and can therefore be used in a mixed configuration in an installation.

The circuit breakers can be mounted alongside each other or one above the other, whereby the distance of the circuit breakers is determined solely by the length of the Bowden cable (lengths: 2 m/3 m/4.5 m). Interlock signals are looped through using the Bowden cables. Interlocking is only effective in the connected position in the case of withdrawable circuit breakers. The mechanical endurance of the Bowden cables is 10000 operating cycles.

Minimum requirements must be fulfilled in the switchgear for the interlocking to function:

• Bowden cables must be installed as far as possible in a straight line with minimum bending.
• The bending radii of the Bowden wire must be greater than 500 mm.
• The sum of all bending angles along the Bowden wire must not exceed 640°.
• In a vertical arrangement of circuit breakers to be interlocked, the interlocking mechanisms must be in line.
• Circuit breakers to be interlocked must be arranged so that Bowden cables can be optimally installed in compliance with the conditions mentioned in the above points.
• The installed Bowden cable must be fixed (with cable ties or the like) before the interlock is adjusted.
• Select the width of switchgear cubicle to allow enough freedom of movement for adjusting the interlock!
• Openings and cut-outs in system elements must be designed so that Bowden cables are not changed in direction or obstructed when they are passed through.

Communication-capable circuit breakers

Communication with PROFIBUS DP

Communication with MODBUS

The requirements for power distribution in terms of communication capability, data transparency, flexibility and integration are constantly increasing. An integrated and modular communication architecture was designed for the SENTRON 3WL5 to ensure that it can satisfy these requirements.

The core component of this architecture is the CubicleBUS, which links together all of the intelligent components within the SENTRON 3WL5 and enables the easy and safe connection of other additional external components to the circuit breaker. The CubicleBUS is already incorporated and pre-connected in all complete circuit breakers with ETU45B trip units.

The high level of modularity of the system allows communication functions to be retrofitted at any time (e.g. the measurement function). Similarly, the upgrade of a non-communication-capable SENTRON 3WL5 (e.g. changeover from ETU25B to ETU45B with CubicleBUS) can be carried out easily on site in the plant. All modules connected to the CubicleBUS can directly access the existing source data of the circuit breaker, which guarantees the quickest possible access to information and response to events.

Furthermore, additional external modules (including digital inputs/outputs, analog outputs) can be connected to the CubicleBUS to provide cost-effective solutions for the automation of further devices in the switchgear.

SENTRON 3WL communication-capable circuit breakers

Data that can be transmitted over the PROFIBUS DP or the Breaker Data Adapter

	All SENTRON 3WL5s with ETU45B (CubicleBUS integrated)
Transmittable circuit breaker data	BSS	BDA	BSS	COM15/ COM16
Order code (Order No. of circuit breaker + "–Z") Order No.	F01 +BDA/BDA Plus- Order No.		F02/F12
Potential applications
Transmission of circuit breaker data to PROFIBUS DP or MODBUS and integration into higher-level visualization systems are possible e.g. in PCS7, Power Management Systems, WinCC (including add-ons like the text message radio server)	--		✓
Transmission of circuit breaker data and software (i.e. HTML pages with data) to a local output device, or remotely through Ethernet/Intranet/Internet (without the possibility of integration into higher-level visualization systems) e.g. for monitoring, diagnostics, maintenance and parameterization of individual circuit breakers	✓		--
Utilization of the functionality of all CubicleBUS modules e.g. configuration of the configurable digital output module, status check of the digital input modules, diagnostics	✓		✓
Transmittable circuit breaker data without integrated measurement function
Device identification
Communication address, Order No., circuit breaker in delivery status, circuit breaker parameters (size, number of poles, rated current module etc.), identification numbers, release type	✓		✓
Free text for plant code and comments	-- 1)		✓
Operating statuses
On/off status message, storage spring, tripped, readiness	✓		✓
Switching position (connected, test and disconnected position, not present) for withdrawable circuit breakers,	-- 1)		✓
PROFIBUS/MODBUS write protection on/off, free user input	-- 1)		✓
Control commands
Switch circuit breaker on/off, switch free user output on/off	-- 1)		✓
Reset tripped signal	✓		✓
Delete event and history memory	-- 1)		✓
Reset the min./max. measured values, reset the maintenance information	✓		✓
History Read out the event protocol, read out the release protocol	-- 1)		✓
Maintenance information
Number of tripping operations L, S/I and in total, contact wear	✓		✓
Number of operating cycles under load and in total, number of operating hours	-- 1)		✓
Event signals
Tripped signal with details of the tripping current	✓		✓
Alarm signals (e.g. overload) with incoming/outgoing information	-- 1)		✓
All of the named event signals with time stamp	-- 1)		✓
Parameterization of the protection functions
Reading out of the protection function parameters	✓		✓
Measured values
Phase currents, each with min./max. value	✓		✓
Temperature in the circuit breaker with min./max. value	-- 1)		✓
Temperature in the control cabinet with min./max. value	-- 1)		✓
All of the named measured values with time stamp	-- 1)		✓
Additional transmittable circuit breaker data with integrated measurement function	Measurement function Plus
Order code F01+ ... or F02+	F05
Additional event signals Threshold value alarms (e.g. over/underfrequency, over/undervoltage)	✓
Parameterization of the extended protection functions and setpoints (threshold values)
Reading out the parameters of the extended protection functions	✓
Settings for the extended protection function parameters can be changed	✓
Reading out and adjusting threshold values	✓
Additional measured values
Voltages, power, energy, power factor, frequency, each with min./max. value	✓
Harmonic analysis	✓
Recording of currents and voltages for configurable events in the curve form memory	✓

1) Data only available in conjunction with the COM15/COM16 module (BUS connection not required).

✓ Available

--Not available

CubicleBUS modules

Digital output modules with rotary coding switch

6 items of binary information concerning the state of the circuit breaker (reasons for tripping and warnings) can be output via this module to external signaling devices (e.g. LED, horn) or be used for the selective shut-down of other system components (e.g. frequency converters).

Digital output modules are available in versions with and without a rotary coding switch. On modules with a rotary coding switch it is possible to choose between two signaling blocks each with 6 defined assignments and to set an additional response delay.

All the digital output modules are available as a version with relay outputs (CO contacts, up to 12 A). Up to two modules of this type can be connected to one SENTRON 3WL5.

Digital output modules with rotary coding switch

Digital output modules, configurable

The configurable output module is available for higher-performance solutions. With this module, random events on the CubicleBUS can be switched directly to one of six available outputs or three of these outputs can be assigned with up to six events. In other words, up to six events can be placed on one physical output with OR operation. Either BDA/BDA Plus or Switch ES Power is used for configuring.

A relay variant is also available here the same as for the output modules with rotary coding switch. Only one module of this type is possible per SENTRON 3WL5.

Digital output modules, configurable

Analog output modules

The analog output module can be used to output the following measured values to analog indicators in the control cabinet door:

• IL1, IL2, IL3, IN or
• UL12, UL23, UL31, UL1N or
• PL1, PL2, PL3, Sges or
• power factor 1, power factor 2, power factor 3, ΔI% or
• favg, ULLavg, Pges, power factor avg

Four 4-20-mA/0-10-V interfaces are available for this. The measured values to be output are selected with a rotary coding switch. By using the analog output module it is possible to do without additional converters and their conventional installation/wiring in the main current path. Up to two modules of this type can be connected to one SENTRON 3WL5.

Analog output modules

Digital input modules

With the digital input module, up to 6 additional binary signals (24 V DC) in the circuit breaker environment can be connected to the system. It is thus possible to send messages concerning the state of a switch disconnector or a control cabinet door to the PROFIBUS DP/MODBUS.

One module each of this type can be used for holding the six items of digital information and for automatically switching over the parameters.

Digital input modules

ZSS modules (short-time grading control)

The use of ZSS modules is recommended when Siemens circuit breakers are arranged in several staggered levels but full grading with the smallest possible delay is to be assured nevertheless.

The circuit breakers are interconnected by these modules. In case of a short-circuit, each affected circuit breaker asks the circuit breakers directly downstream whether the short-circuit has also occurred in the next, lower level. The short-circuit is exactly localized as the result, and only the next upstream circuit breaker in the energy flow direction is switched off.

ZSS modules (short-time grading control)

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