Siemens 3RH1140-1BB40 Contactor

Siemens 3RH1140-1BB40 Contactor is a compact Sirius relay designed for control panels and automation cabinets. It features a 24 V DC coil and four normally open auxiliary contacts (4NO) mounted on a 3-pole, size S00 base with screw-terminal connections for secure wiring. The device carries an insulation voltage of up to 690 V and front IP20 protection, making it suitable for interior enclosures and standard industrial environments. Engineered for longevity, the 3RH1140-1BB40 offers millions of mechanical cycles and a robust main-contact life aligned with Siemens Sirius specifications. Its small footprint and screw-terminal interface simplify panel wiring while preserving reliability, and it integrates smoothly with Siemens automation ecosystems for signaling, interlocking, and auxiliary switching tasks. Typical applications include PLC interfacing, machine-control interlocks, and control-circuit switching in compact panels where space is at a premium. Operating temperature range is -25 to +60 C, and installation altitude can reach up to 2,000 meters above sea level, ensuring dependable operation in a variety of industrial settings.