Siemens 3TH4022-0A Contactor Relay

Siemens 3TH4022-0A Contactor Relay is a four-form-contact control relay from the Siemens World Series designed to switch AC loads in industrial control circuits. It uses a 120 V AC coil and provides two normally open (NO) and two normally closed (NC) auxiliary contacts, enabling interlocks, status feedback, and control logic alongside the main switching function. The main contact rating supports up to 400 V at 50 Hz and up to 480 V at 60 Hz, making it compatible with common 3-phase power distributions used in automated equipment. This compact device is typically employed to energize or de-energize motors, conveyors, fans, and other machinery in control cabinets and process lines where reliable, rule-based control is required. As part of Siemens' 3TH control-relay family, the 3TH4022-0A offers integration with standard Siemens automation components and wiring schemes, helping simplify panel wiring and maintenance.