Siemens 3RV1721-1CD10 Circuit Breaker

Siemens Sirius 3RV1721-1CD10 is a single‑pole motor starter protector from the SIRIUS 3RV2 family, designed to protect and switch small to mid‑size AC motors in 600/347 V control circuits. The device provides thermal‑magnetic protection with a standard motor current (FLC) of 1.3 A and a typical full‑load current (FLA) of 0.9 A, which corresponds to a 0.75 hp motor at the specified voltage, and it carries a short‑circuit current rating (SCCR) of 10 kA. In typical installations, it is used as part of a modular motor control assembly alongside a 3RT1023 magnetic controller and a 3RB2906‑2BG1 overload relay to deliver coordinated protection and control. Rated for Type C protection at 600/347 V, it supports copper conductors with a cross‑section of 14 AWG, and the 3RV1721‑1CD10 designation identifies the exact model within the Siemens catalog. This combination of protection, control, and interchangeability with common Siemens motor‑control components makes it suitable for panel builders, machine builders, and service engineers needing compact, reliable motor protection in standard industrial environments.