Siemens 3RH2140-1BG40 Industrial Power Contactor

Siemens 3RH2140-1BG40 is a compact S00-frame power contactor from the 3RH2 family. It provides four normally open contacts (4 NO) and is driven by a 125 V DC coil, with wiring via screw terminals for easy panel installation. On the load side, it is rated for 3 A at up to 690 V AC (AC-3), making it suitable for switching inductive loads in control cabinets and automation panels. The S00 footprint and screw-terminal design support straightforward mounting and wiring in compact control circuits, while the four NO contacts enable multiple circuits to be controlled from a single coil. This model is commonly used in machine control and process automation where a DC control signal energizes the contactor to switch loads, and it integrates with Siemens’ broader 3RH2 line for consistent performance in industrial environments.