Siemens 3RV1742-5DD10 Circuit Breaker

Siemens 3RV1742-5DD10 is a SIRIUS size S3 molded-case circuit breaker designed for plant protection and UL 489/CSA C22.2 No.5-02 compliance. This 3-pole device provides a thermal overload release set to 25 A and an instantaneous (short-circuit) release rated at 325 A, enabling reliable protection for circuits up to a 690 V system voltage. It features screw-terminal connections for secure wiring and includes an auxiliary switch for control and status signaling. The front of the unit carries an IP20 rating, suitable for indoor panel installations, with operating temperature from -20 to +60 °C and installation altitude up to 2,000 meters above sea level. Power loss is typically 12 W, reflecting its efficiency in steady-state operation, and the main contacts are designed for about 50,000 switching cycles. The model sits in Siemens’ SIRIUS protection lineup as a compact protective device with standard switching capacity, intended for panel builders and integrators needing a reliable, settable overload release and robust instantaneous trip within a compact S3 enclosure.