Siemens 3RH1122-1BB40 Electrical Contactor Relay

Siemens 3RH1122-1BB40 is a Sirius contactor relay with four poles (2 normally open and 2 normally closed) and a 24 V DC coil, in the compact S00 size with screw-terminal connections. It supports an insulation voltage up to 690 V and front IP20 protection, and is designed for control circuits with an operating range of -25 to +60 C; the mechanical life is specified at up to 30,000,000 switching cycles. The device tolerates surge voltages up to 6 kV and shocks of 10 g for 5 ms (and 5 g for 10 ms), and is approved for installation at elevations up to 2,000 meters. This exact model is documented as obsolete by Siemens, with the successor 3RH2122-1BB40, reflecting the Sirius line’s ongoing refinement of compact, four-pole relay solutions.