Siemens 3RH1140-1AK60 Contactor Relay 120VAC 60Hz

Siemens 3RH1140-1AK60 Contactor Relay is a Sirius four-pole contactor with four normally open (4 NO) contacts in the compact S00 frame, featuring screw-terminal wiring for easy panel mounting. It uses an AC coil rated for 120 V at 60 Hz (Siemens lists 110 V AC / 50 Hz or 120 V AC / 60 Hz), energizing all four contacts to switch loads in control circuits. This configuration makes it suitable for coordinating multiple auxiliary devices, relays, and PLC inputs from a single coil in industrial automation and machine-control panels. Siemens notes this model is no longer available and designates the direct replacement as the 3RH2140-1AK60, ensuring compatibility within the Sirius family. The four normally open contacts provide independent switching paths, simplifying control logic and reducing component count in compact installations; typical applications include motor-control sequences, interlocks, and distribution of control signals in panel assemblies.