Siemens 3RV1021-1DA15 Motor Protection Circuit Breaker

Siemens 3RV1021-1DA15 is a three-pole motor protection circuit breaker from the SIRIUS family, sized S0 for motor protection in three-phase, 50/60 Hz systems; it combines overload and short-circuit protection in a compact device designed to interrupt motor current safely and reliably. It features an adjustable thermal overload (A-rel) ranging 2.2 to 3.2 A and a fixed short-circuit release of 42 A, plus a transverse auxiliary switch with 1 normally open and 1 normally closed contact, and screw terminals for straightforward wiring. This unit is intended for use in motor control circuits where integrated protection and signaling are required, offering a clear main contact path and an auxiliary contact pair to enable remote monitoring or interlocking within compact control panels.