Siemens 3RV1721-4CD10 Molded Case Circuit Breaker

Siemens 3RV1721-4CD10 is a three-pole molded‑case circuit breaker from the SIRIUS 3RV1 family, size S0, designed for system protection with UL 489 and CSA C22.2 No. 5-02 approvals. It carries a continuous current rating of 22 A and offers an A‑release (thermal) of 22 A and an N‑release (short‑circuit) of 286 A, with screw terminals for standard switching capacity. The device includes an auxiliary switch option and exhibits a surge voltage resistance of 6,000 V, IP20 front protection, and shock resistance of 25 g/11 ms. Its mechanical life is typically 100,000 switching cycles, and the total power loss at the rated current is about 10.5 W (3.5 W per pole). This 3P MCCB is intended for industrial plant protection and panel applications where UL/CSA listed molded‑case protection is required.