Preassem. combination pos. metal 1xm20x1. 5 without operating head snap-action contacts 1no+1nc with 2xled 24 v ac/dc, green/yellow with unit connect. 3sy3131 pin assign. : pin1=21, pin2=22, pin3=13, pin4=14 pin5 not used, pin6=ground, to leds: led green: plus to terminal 13 led yellow: plus at terminal 14 grounding connection