Motor protection circuit breaker, size S00, 0.5 A, CLASS 10
The Siemens SIRIUS 3RV2011-0FA25-ZW96 is a motor protection circuit breaker in size S00, designed for protecting small motor loads up to 0.5 A operational current. The CLASS 10 trip class means it will trip within 10 seconds at 7.2x the thermal setting — fast enough to protect a motor winding during a stall or locked-rotor event without nuisance tripping on normal starting inrush. The 100 kA breaking capacity at 400 V AC (and across the full 240–690 V range) means this breaker can safely interrupt fault currents up to that level without upstream fuses needing to clear first, simplifying coordination in a panel. The 0.5 A rating places this at the low end of the SIRIUS motor protection range — it's sized for fractional-horsepower motors, small pumps, fans, or conveyor drives drawing under 0.5 A full-load. The thermal overload release is adjustable (0.35...0.5 A per the description), so you set it to match the motor nameplate FLA. The magnetic short-circuit release is fixed at 6.5 A, which is about 13x the maximum thermal setting — that's a deliberate gap to ride through motor start without tripping on inrush. Spring-type terminals on the main circuit accept 0.5–4 mm² solid or stranded, and the integrated transverse auxiliary switches (1 NO + 1 NC) give you a status feedback signal without needing a separate add-on block. That saves a DIN rail slot and a wiring step.
Panel integration and mounting
Size S00 snaps onto 35 mm DIN rail per EN 60715 — standard for any European-style control panel. The 45 mm width matches the S00 contactor footprint, so it lines up directly with a SIRIUS 3RT2 contactor for a compact motor starter assembly. No side clearance needed when ganged with other S00 devices; the manufacturer specifies 0 mm spacing for side-by-side mounting. Spring-cage terminals on this variant (the -ZW96 suffix indicates spring-type) mean no screw torque to verify — just strip to 8 mm and push in. That's a time-saver on a panel build with dozens of these breakers.
Lifecycle and sourcing
RoHS compliance date is noted as October 1, 2009, which aligns with the EU RoHS directive. The part carries the standard Siemens SIRIUS documentation package — CE, UL/CSA pending confirmation on the specific variant, but the base design is UL-recognized. For a BOM line, this is a straightforward source: quoted to order against an RFQ, with availability and current pricing confirmed at quote time.