The Siemens 3RV2011-1KA10-ZX95 is a SIRIUS motor protection circuit breaker sized for a 12.5 A motor at 480 V, with a Class 10 trip curve that clears a stalled rotor fast enough to keep the winding insulation intact on standard induction motors. It interrupts up to 100 kA at 400 V, so it handles high-fault-current panels without needing an upstream current-limiting fuse on most industrial services. Phase failure detection is built in — if one leg drops, the breaker trips before single-phasing cooks the motor. The 45 mm width (3-module DIN footprint) and 97 mm depth let it drop into a standard 3RV cutout. Mounts on 35 mm DIN rail per DIN EN 60715 with the screw-and-snap method — no adapter plate needed. Clearance: 50 mm above and below for arc venting, 30 mm to the side, zero forward or backward. Any mounting position works.
Interrupting & coordination
The 3RV2011-1KA10-ZX95 carries a 100 kA interrupting rating at 240 V and 400 V, 42 kA at 500 V, and 4 kA at 690 V. That 100 kA at 400 V is the number that matters for most North American and European panels — it lets you coordinate downstream without a fuse ahead in many 400 V services. The gL/gG fuse limits at the same voltages: 63 A at 400 V, 50 A at 500 V, 40 A at 690 V. If your panel has a 65 kA SCCR requirement, this breaker meets it at 400 V without extra hardware. Compared to the 3RV2023-4DA10 — a larger-frame SIRIUS breaker — the 3RV2011-1KA10-ZX95 is physically the same 45 mm width and 97 mm depth, so it fits the same DIN rail cutout. The 3RV2023-4DA10 steps up to a higher current range (typically 22–32 A) and a higher interrupting capacity at 690 V. If your BOM calls for the 3RV2023-4DA10 but you only need 12.5 A, this unit drops in without rewiring — same terminal spacing, same screw-type connections. Just verify the trip class and current setting match your motor FLA.
Integration & wiring
Screw terminals on the main circuit accept 2x (0.75–2.5 mm²) solid or stranded, or 2x 4 mm². Main contact screws are M3. Torque to the Siemens spec (typically 1.2–1.5 Nm, verify on the nameplate). The breaker snaps onto 35 mm DIN rail — no tools for mounting, but the screw clamp secures it if vibration is a concern. Operating temperature -20 to +60 °C; storage -50 to +80 °C. The wide voltage range (20–690 V) covers global line voltages without a different variant.