Siemens 3RH2140-1BB40 Auxiliary Contactor Relay 24 V DC 4 NO

The Siemens 3RH2140-1BB40 is an auxiliary contactor relay with four normally open (4 NO) contacts, ideal for control-circuit applications. It operates with a 24 V DC coil and supports system voltages up to 690 V AC for the auxiliary side.

Compact in design, it measures just 57.5 mm high, 45 mm wide and 73 mm deep, making it well-suited for space-constrained panels. The relay is part of the SIRIUS range and is built for high reliability, with a typical mechanical life of 30 000 000 switching cycles.

Engineered for demanding environments, it withstands ambient temperatures from -25 °C to +60 °C, and is rated for shock, vibration and surge voltages up to 6 kV. The screw-terminal connection design provides ease of wiring and secure contact across industrial control setups.

Whether used in machine panels, automation systems, or safety circuits, the 3RH2140-1BB40 delivers dependable switching with top-quality design and long service life.