The Schneider Electric C254TM160C is a thermal-magnetic trip unit from the ComPacT NSX250 range, rated 160 A at 50 °C. It provides LI protection — thermal overload (L) and magnetic short-circuit (I) — across 4 protected poles (4D) with the neutral on the left. The fixed instantaneous pick-up trips at 1250 A, so it clears hard faults fast without adjustment.
The long-time pickup (Ir) is adjustable from 0.7 to 1.0 x In, so you can dial it down to 112 A if the downstream load is lighter. The fixed Ii at 1250 A (about 7.8 x In) means magnetic trips only on serious faults, not on normal motor inrush.
This trip unit snaps into a ComPacT NSX250 fixed-mount circuit breaker frame. The 4P 4D configuration protects all four poles, with the neutral pole at full rating (1 x Ir).