Siemens 3RV2321-4DC20 Molded Case Circuit Breaker

Siemens 3RV2321-4DC20 is a 25 A motor protection circuit breaker (MPCB) from the 3RV2 family, sized for starter combinations (S0). It delivers overload protection with an instantaneous N-release of 325 A and uses a spring-type terminal for secure connections. Rated for 690 V AC, the device is designed for motor control in industrial panels and suits compact starter assemblies where space is at a premium. Its molded-case construction measures about 45 mm wide, 119 mm high, and 97 mm deep, enabling relatively small footprints in control enclosures. The unit is specified for operation across a -20°C to 60°C ambient range and provides standard switching capacity in its class. Widely used to protect small motors and motor-driven equipment, 3RV2321-4DC20 combines Siemens reliability with the convenience of a dedicated motor-protection breaker in starter configurations, ensuring coordinated protection with compatible Siemens accessories in the 3RV2 line.