Siemens 3RH2122-1BB40 Auxiliary Contactor Relay 24 V DC – 2NO + 2NC

The Siemens 3RH2122-1BB40 is a compact auxiliary contactor relay from the SIRIUS range. It features two normally open (2NO) and two normally closed (2NC) contacts, and operates via a 24 V DC coil.

Designed for modern control circuits, this relay fits the S00 size frame and uses screw-terminal connections for secure wiring. It supports system voltages up to 690 V AC, making it suitable for demanding environments.

With a mechanical service life of up to 30 million switching cycles, the 3RH2122-1BB40 is built for high reliability and long-term operation. Its durable state means fewer interventions and smoother workflow in control panels, machinery, and automation setups.

This compact relay also has strong resistance to vibration, shock, and temperature variations — it operates smoothly between -25 °C and +60 °C.

If you need a dependable, space-saving relay that blends functionality and durability in industrial or machine control settings, the 3RH2122-1BB40 delivers trusted performance and simple integration.