Siemens AG 3RU1136-4HB0 Three Phase Contactor

Siemens 3RU1136-4HB0 is a Sirius thermal overload relay (size S2) designed to mount to three-pole contactors and protect 3‑phase motors in 40–50 A circuits. It provides 1 normally open and 1 normally closed auxiliary contact, class 10 trip characteristics, with automatic and manual reset for the trip. Rated for 690 V insulation voltage with a 6 kV surge withstand, it features IP20 front protection, operating temperatures from -20 to +70 C, installation altitude up to 2,000 m, and a typical power loss around 9 W. This relay mounts to Siemens 3RT contactors (examples include 3RT1033/1034/1035/1036) and is part of the Sirius 3RU family; catalogs note a successor model, 3RU2136-4HB0.