Siemens 3RH2131-1BB40 Contactor Relay 24VDC Industrial

Siemens 3RH2131-1BB40 is a four-pole SIRIUS contactor relay with a 24 V DC coil, designed to switch higher-current loads in automation and machine-control panels. It provides three normally open contacts and one normally closed contact (3NO + 1NC) in the compact S00 frame and uses screw-terminal connections for reliable wiring in control circuits. Weighing about 0.270 kg, it belongs to the 3RH2 family of contactor relays and supports an auxiliary contact option for expanded control logic. The unit is rated for a current of up to 10 A (typical) and consumes about 4 W of coil power at rated current, with insulation voltage up to 690 V and a pollution degree of 3, making it suitable for standard industrial environments and 24 V control-systems. The 24 V DC coil and screw-terminal S00 form-factor make it a common choice for motor-start/stop sequencing, interlocking, and general control tasks within automation panels, including conveyor lines, presses, and packaging equipment.