Siemens 3RH2131-1BB40 Auxiliary Contactor Relay 24 V DC Coil

The Siemens 3RH2131-1BB40 is an auxiliary contactor relay designed for reliable control-circuit switching. It belongs to the compact SIRIUS series and features three normally open (3NO) contacts and one normally closed (1NC) contact. The relay operates with a 24 V DC coil, providing fast and stable switching for a wide range of applications.

Its compact S00 design saves valuable space in electrical panels while still offering strong performance. The relay supports insulation voltages up to 690 V and is built to handle demanding industrial conditions. It also offers excellent mechanical endurance, with millions of switching cycles expected over its service life.

The device uses screw-terminal connections for secure and straightforward wiring. It performs reliably in environments exposed to shock, vibration, dust, and frequent temperature changes, with an operating range from –25 °C to +60 °C.

The 3RH2131-1BB40 is a practical choice for machine control, automation systems, and general industrial switching tasks, delivering dependable operation in a compact and long-lasting design.