Siemens 3TH20-22-0BB4 Control Relay

Siemens 3TH20-22-0BB4 is a four-pole auxiliary contactor (control relay) with a 24 V DC coil that provides two normally open and two normally closed auxiliary contacts for control circuits. The model 3TH2022-0BB4 specifies a 24 V DC coil and a 4 A switching capacity for the auxiliary contacts, with screw-terminal wiring and front IP20 protection. This Siemens device is part of the 3TH20 family and is typically used to interface PLCs, relays, and machine controls in control cabinets, offering compact, reliable control logic and interlock signaling. Typical applications include signaling, interlocking, and control of small actuators or circuits where a robust 24 VDC control relay is required.