Siemens 3TH2022-0BB4 Control Relay

Siemens 3TH2022-0BB4 Contactor: a four-pole control relay with two normally open and two normally closed auxiliary contacts designed for DC-coil operation. The device uses screw-terminal connections for both the control circuit (DC supply) and the auxiliary contacts and carries the Siemens reference 22E under EN 50011, with IP20 front protection. With a 24 V DC coil, it is part of the 3TH2 family, built for compact panel mounting and straightforward wiring. The auxiliary contacts are rated for up to 4 A at 230 VAC (AC-15) and up to 3 A at 400 VAC, enabling it to switch signaling lines or small loads in automation and machine-control applications. In practice, this 3TH2022-0BB4 can be used to implement interlock logic, signaling, and control of actuator circuits within industrial control panels, offering a discrete, reliable means to manage complementary NO/NC circuits from a single device. Its 2NO/2NC configuration supports both normally closed safety circuits and normally open control paths, simplifying control logic where a compact 4-pole unit is beneficial.