Siemens 5ST3071 Manual page 8

5ST3071
N/-, L/+ = Supply voltage
COM = return conductor
OFF = OFF command max.10V DC from the device 23 = Normally Close (NC)
ON = ON command max.10V DC from the device
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Aux. Contact
21 = Normally Open (NO) 11 = Normally Open (NO)
22 = return conductor
Fault signal
12 = return conductor
13 = Normally Close (NC)