The Siemens 3RV6411-1FA10 is a SIRIUS circuit breaker specifically designed for transformer protection, size S00. It's a 3-pole thermal-magnetic breaker rated at 5 A operational current, with a Class 10 trip characteristic — meaning it trips within 10 seconds at 7.2× the set current, which matches the inrush profile of most control transformers. Rated for 690 V AC-3 maximum, 50/60 Hz, and delivers 5 A at AC-3 400 V — so it handles the full rated current under motor-like switching duty. The magnetic short-circuit release provides instantaneous protection on faults, while the thermal overload release handles sustained overcurrents.
Mounting and fit
Clearance requirements: 50 mm above and below, 30 mm to the sides, 0 mm front and back. That zero front/back clearance means you can butt it against the panel door or rear wall without derating. Main circuit connections are screw-type terminals at top and bottom, accepting 2×(0.75…2.5 mm²) solid/stranded or 2×4 mm², or AWG 2×(18 to 12). Torque range 0.8…1.2 N·m. Finely stranded with ferrule: 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²).
Environment and compliance
Current production — no phase-out announced. Operating temperature -20…+60 °C, transport -50…+80 °C, relative humidity 10…95 %. Shock resistance 25 g / 11 ms per IEC 60068-2-27. Installation altitude up to 2000 m. Surge voltage resistance 6 kV. RoHS compliance date 05/01/2012. Power loss 6 W total typical.