Siemens 3TH2031-0BB4 Thermal Overload Relay Module

Siemens 3TH2031-0BB4 Contactor relay is a 4-pole auxiliary contact block (3 normally open, 1 normally closed) with a 24 V DC coil, designed for use with Siemens 3TH2 main contactors. It provides three NO contacts and one NC contact, rated for 4 A, with screw-terminal connections for straightforward wiring. The unit carries IP20 protection on the front and is specified under EN 50 011 (31E) standards. Typical applications include signaling and interlock in control circuits, providing reliable feedback to PLCs or safety interlocks in automation panels when the coil is energized with 24 V DC. This 3NO+1NC accessory aligns with 3TH20-series configurations, enabling auxiliary contact functionality for control logic and status indication within industrial control systems.