The Schneider Electric C10B3TM050 is a ComPacT NSX100B molded-case circuit breaker with a 50 A thermal-magnetic TM-D trip unit, three poles protected, and a 25 kA interrupting capacity at 415 V AC. That 25 kA Icu at 415 V (the 'B' breaking capacity code) is the rating that governs fault-clearing in a 400 V distribution panel — it tells you the breaker can safely interrupt a bolted fault up to 25,000 A without welding contacts or rupturing the case. At 240 V the same breaker handles 40 kA Icu, so if your service entrance is 240/120 V split-phase you get headroom; at 500 V it drops to 15 kA Icu, which still covers most industrial motor branch circuits. The thermal-magnetic trip gives L (overload) protection via a bimetal element and I (short-circuit) protection via a solenoid — no electronic adjustments, no auxiliary power needed, just a fixed curve that holds coordination with downstream breakers.
The 105 mm width × 161 mm height × 86 mm depth footprint fits standard ComPacT NSX cutouts; front-front connections (both line and load) simplify bus-bar routing in a multi-breaker lineup.
Rated for 50,000 mechanical operations and 30,000 electrical cycles at rated current (440 V In). The IP40 front face keeps tools and fingers out; the enclosure itself carries IK07 impact resistance, so it survives a dropped screwdriver during commissioning.