Siemens SIRIUS 3RH2122-1A is a contactor relay with4 fixed contacts 2 normally open (NO) and 2 normally closed (NC). It operates at 230V AC, 50/60  and screw  This relay conforms to IEC 60947-5-1 standards and is part of the SIRIUS 3RH2 contactor relay family. 

Contacts:3 Normally Open (NO) + 1 Normally Closed (NC)

Voltage: 230V AC, 50/60 Hz

Power Loss: 1.43 W (without load)

Insulation Voltage: 690V (rated)

Surge Voltage Resistance: 6 kV

Operation: -25°C to +60°C

Control Supply Voltage: 230V AC (50/60 Hz)