Siemens 3RH2131 2LB40 Contactor

Siemens 3RH2131-2LB40 is a SIRIUS four-pole coupling contactor relay in frame size S00, configured with 3 normally open and 1 normally closed contacts for compact control of PLC outputs. It uses a 24 V DC coil with a nominal voltage range of 17–30 V DC, and offers spring-loaded terminals for fast, vibration‑resistant wiring. An integrated varistor provides surge suppression to protect the coil from inductive spikes, helping extend service life in demanding panels. Rated for up to 10 A at up to 690 V AC, this 3RH2 contactor is designed to switch small to medium loads such as solenoids or compact motors, while maintaining a space‑efficient footprint in upright-mounted installations. Not expandable with auxiliary switches, it delivers a straightforward, single‑module solution within Siemens’ SIRIUS family for reliable panel‑level control in automation projects.