Motor-protection breaker with magnetic-only trip
The C10F3MA025 is a ComPacT NSX100F circuit breaker from Schneider Electric, rated 25 A at 65 °C with a magnetic-only (MA) trip unit. It protects motor circuits against short-circuits only — no thermal overload element, so you pair it with a separate overload relay upstream. The 3-pole unit breaks up to 36 kA at 415 V AC (Icu per IEC 60947-2), which covers most industrial motor branch circuits in a 400 V panel. The MA trip responds to magnetic faults only, with a fixed instantaneous threshold typically around 12× In. That keeps it from nuisance-tripping on motor inrush while still clearing a bolted fault fast. For a 25 A motor circuit, that means the breaker holds through the start surge and trips only when the winding or cable faults. Mounts on a backplate, front-connected both sides, with a 35 mm connection pitch. The toggle handle gives manual on/off control. IK07 impact rating handles accidental tool strikes during maintenance.
For a 480 V panel (common in North America), it still delivers 25 kA Icu per UL 60947-4-1. Utilisation category A means it's not intended for cascading selectivity with downstream breakers — it's a standalone branch protection device.
Fits a standard backplate mount, horizontal or vertical orientation. Electrical durability is 50,000 cycles at 440 V at half rated current, 30,000 cycles at full rated current. Mechanical durability is 50,000 cycles. That's typical for a molded-case breaker in a motor-starting application.
