1. 3RH2131-2BM40 is a contactor made by Siemens. It is a part of the 3RT2 range of contactors, and is suitable for AC-3 load switching up to 690V AC, 40A at 40°C, and 40A-AC1 and 28A-AC3 of 400V AC at 40°C.
2. The 3RH2131-2BM40 is a thermal overload contactor and has a size of S2. It is a two-pole contactor, with an auxiliary contact block, 1 NO and 1 NC, and an auxiliary contact block, 1 NO and 1 NC.
3. The contactor has a built-in thermal protection unit, as well as thermistors and monitoring contacts. It can be mounted on 35mm DIN rail or on a surface enclosure, and it has a power dissipation of 4.4W at 400V ac.