Motor protection circuit breaker, size S00 — 12.5 A, CLASS 10
The Siemens SIRIUS 3RV1011-1KA10-ZI45 is a motor protection circuit breaker sized for the S00 frame, rated at 12.5 A operating current with an adjustable thermal overload release spanning 9 to 12.5 A. This breaker is designed for motor protection duty, combining a thermal overload element for sustained overcurrents and a magnetic short-circuit trip.
The S00 frame measures 45 mm wide, 90 mm high, and 75 mm deep, with 20 mm clearance required above and below the unit and 9 mm at the sides — no extra space needed in front or behind. That keeps the footprint tight on a crowded DIN rail. The breaker snaps onto standard 35 mm rail and accepts screw-clamp wiring; the Pozidriv #2 screw terminals torque to 0.8–1.2 N·m for both main and auxiliary contacts. At full load the breaker dissipates 9.25 W total (3.1 W per pole) in the hot operating state — a factor to check when calculating enclosure heat rise in a sealed panel.