Siemens 3RH2271-1BB40 Auxiliary Contactor Relay

Siemens 3RH2271-1BB40 is a SIRIUS auxiliary contactor relay in the compact S00 frame that provides seven normally open and one normally closed auxiliary contacts for signaling and control tasks. It is coil-driven by 24 V DC and wired via screw terminals, and it includes a captive auxiliary switch for straightforward integration in control circuits. The device is rated for up to 690 V AC on its auxiliary contacts and supports a control-current rating (Ie) of 3 A at 400 V, making it suitable for signaling and interlock duties rather than heavy motor loads. With the S00 frame and screw-term connections, it integrates neatly into Siemens SIRIUS control panels and cabinets. Typical applications include signaling, interlocks, PLC inputs, and other control-circuit tasks where a robust, multi-contact auxiliary unit is needed.