The Siemens 3RV1011-0JA25 is a SIRIUS motor protection circuit breaker sized for a 0.25 kW motor at 400 V. It carries a 1 A continuous rated current and a CLASS 10 trip characteristic, meaning it clears overloads fast enough to protect standard induction motors during start-up without nuisance tripping. Phase failure detection is built in — critical for three-phase motor lines where a lost phase can cook the winding. Breaking capacity is 100 kA at 400 V AC, so this breaker can interrupt a bolted fault up to that level without upstream devices needing to clear it. That high SCCR simplifies panel coordination — no need for a larger upstream fuse just to protect this branch. Terminals are spring-loaded on both the main and auxiliary circuits, accepting 2x (0.25... 2.5 mm²) solid or 2x (24... 14) AWG stranded. Snap-on mounting onto 35 mm DIN rail per EN 50022, with 0 mm clearance needed at the sides or rear — zero-gap stacking on the rail. Mounting position is any. IP20 on the front face keeps fingers out.
Auxiliary Contact Ratings
The integrated auxiliary switch is rated 1 A at 24 V, 0.5 A at 230 V, and 0.15 A at 60 V. That covers PLC-level control signals and contactor coils in most panels. The transverse design means the contact block sits alongside the main body — no extra depth beyond the 81 mm listed.
Environmental & Compliance
Operating temperature range is -20 to +60 °C; storage and transport handle -50 to +80 °C. Shock rated at 25g / 11 ms. Surge voltage resistance is 6 kV. RoHS compliance date is 01.01.2013 — the part meets EU substance restrictions. Power loss in hot operating state is 5.5 W.