Siemens 3RH1131-1JB40 Control Relay

Siemens 3RH1131-1JB40 is a SIRIUS coupling relay with four poles—three normally open (NO) and one normally closed (NC)—designed to translate a 24 V DC control signal into multiple switched circuits in compact control cabinets. It uses a 24 V DC coil with an integrated diode for flyback protection, absorbing about 2.3 W of coil power, and is offered in the S00 frame size with screw terminals for straightforward wiring. The front is IP20 protected for panel mounting, and the device provides an insulation voltage up to 690 V AC with a surge withstand of 6 kV and a pollution degree rating of 3, suitable for typical industrial panel environments. The relay is designed for long life in automation applications, specifying up to 30 million mechanical switching cycles for the contact system, and carries a current rating up to 6 A on the NO contacts. Typical applications include isolating and interfacing PLC outputs to higher-load circuits, driving auxiliary circuits in machine control, and providing a compact coupling between a low-power control signal and multiple auxiliary circuits within Siemens’ SIRIUS family.