3rv20314wa10

The product “AUTOMATIC CIRCUIT SWITCH CLASS S2 42-52A” corresponds, in this case, to a Siemens motor-saving circuit breaker, size S2, adjustable from 42 to 52 A, used for the protection of electric motors. In several catalogs it appears with code 3RV2031-4WA10.

Basically, it is a device that monitors motor absorption and automatically shuts off the power supply when it detects abnormal conditions such as overload, mechanical blockage of the motor or, in three-phase systems, phase failure. It thus serves to prevent damage to the motor and improve the safety of the system.