ComPacT NSX250B, 160 A, 25 kA — panel fit and protection
The C25B6TM160C is a Schneider Electric ComPacT NSX250B 4-pole circuit breaker with a TM-D thermal-magnetic trip unit rated 160 A at 50 °C. It delivers 25 kA Icu at 415 V AC (40 kA at 240 V, 20 kA at 440 V, 15 kA at 500 V) per EN/IEC 60947-2, making it a solid fit for distribution panels where the available fault current stays under those thresholds. The 140 mm width and 161 mm height fit standard MCCB cutouts; depth is 86 mm.
For a 160 A feeder in a 415 V panel with an available fault current of 22 kA, this breaker holds selectivity with downstream 63 A and 100 A devices when coordinated per the Schneider selectivity guide. At 440 V the Icu drops to 20 kA, so verify the transformer secondary fault level if the panel runs at that voltage.
Rated for pollution degree 3 (industrial environments with conductive or dry non-conductive pollution) per IEC 60664-1, overvoltage category III. IP40 enclosure protection means it is suitable for clean indoor panels but not washdown areas. Relative humidity 0–95 %. Mechanical durability 20,000 cycles; electrical durability varies by load — 20,000 cycles at 440 V at half rated current, 10,000 at full rated current.