Siemens 3RV1721-1FD10 Three-Phase Circuit Breaker

Siemens 3RV1721-1FD10 is a three-pole motor starter protector in the S0 frame from the SIRIUS 3RV family, intended for plant protection in 3‑phase electrical installations. It carries UL 489 and CSA C22.2 No. 5-02 approvals and combines a thermal overload function with a short‑circuit release (A‑release rated at 5 A and N‑release rated at 65 A) to interrupt motor circuits under fault conditions. The device uses screw terminals and offers standard switching capacity, making it suitable for motor protection in industrial circuits that protect motors such as pumps, fans, and conveyors. Weighing about 0.23 kg (0.506 lb), this compact protector matches common sizes in the Sirius series and supports integration with other motor protection components in the 3RV lineup for coordinated protection of three‑phase systems.