The C25F3TM160 is a Schneider Electric ComPacT NSX250F 3-pole MCCB with a TM-D thermal-magnetic trip unit rated 160 A at 40 °C. The TM-D provides L (thermal overload) and I (magnetic short-circuit) protection, with the magnetic pickup fixed at a multiple of In — no adjustment dial, which simplifies ordering but means selectivity studies must account for the fixed magnetic threshold. The 36 kA Icu at 415 V AC (breaking capacity code F) is the standard interrupting rating for this frame in 400 V-class distribution; the 85 kA Icu at 240 V AC gives headroom on lower-voltage secondary panels.
IP40 enclosure protection keeps out tools and wires but not water; install inside a panel with a higher-rated door. The 5 accessory slots accept shunt trips, auxiliary contacts, or motor operators without removing the breaker from the bus.
Durability and electrical endurance
Rated for 20,000 mechanical cycles and 10,000 electrical cycles at rated current (In) at 440 V. At half-rated current (In/2) the electrical endurance doubles to 20,000 cycles at 440 V, and 10,000 cycles at 690 V. Power dissipation per pole is 11.78 W — total 35.34 W for the 3-pole unit, which matters for enclosure thermal rise calculations when multiple breakers are ganged.