Schneider C25B4 ComPacT NSX250B Trip Unit 4P

The Schneider Electric C25B4 is the ComPacT NSX250B basic frame - a 4-pole, 250 A circuit breaker body without a protection unit, rated for AC power distribution at up to 690 V. Designed for fixed mounting, it delivers an ultimate short-circuit breaking capacity (Icu) of 25 kA at 380/415 V AC, corresponding to performance level B per IEC 60947-2.

Technical specifications:

• Commercial reference: C25B4
• Manufacturer: Schneider Electric
• EAN:
• Series / range: ComPacT NSX next generation
• Short device name: NSX250B
• Product type: Basic frame (no trip unit)
• Number of poles: 4P
• Neutral position: Left
• Rated current [In]: 250 A at 40°C
• Rated voltage [Ue]: 690 V AC 50/60 Hz per IEC 60947-2
• Network type: AC, 50/60 Hz
• Ultimate breaking capacity [Icu]: 25 kA at 380/415 V AC / 20 kA at 440 V AC / 15 kA at 500 V AC / 40 kA at 220/240 V AC
• Service breaking capacity [Ics]: 25 kA at 380/415 V AC / 20 kA at 440 V AC / 15 kA at 500 V AC / 40 kA at 220/240 V AC
• Rated insulation voltage [Ui]: 800 V AC per IEC 60947-2
• Rated impulse withstand voltage [Uimp]: 8 kV per IEC 60947-2
• Usage category: Category A
• Mounting: Fixed, back plate
• Control type: Handle
• Connection: Upper and lower front, 35 mm
• Mechanical endurance: 20,000 cycles per IEC 60947-2
• Electrical endurance: 10,000 cycles at 440 V AC In per IEC 60947-2
• IP protection: IP40 per IEC 60529
• IK protection: IK07 per IEC 62262
• Pollution degree: 3 per IEC 60664-1
• Operating temperature: -25...70°C
• Storage temperature: -50...85°C
• Dimensions (W x H x D): 140 x 161 x 86 mm
• Weight: 2.211 kg
• Standards: EN/IEC 60947-2, UL 60947-4-1

Features and benefits:

• Supplied as a bare frame without a trip unit, allowing flexible pairing with the appropriate protection unit for the application
• High breaking performance of 25 kA at 415 V AC (performance level B) ensures reliable protection in demanding industrial networks
• Wide rated voltage range up to 690 V AC covers standard low-voltage distribution systems across European and international installations
• Fixed mounting with front connection terminals simplifies panel wiring and integration into existing switchboard layouts
• Suitable for isolation per EN/IEC 60947-2, enabling use as a main disconnecting device
• Operating range of -25...70°C supports deployment in harsh or outdoor-adjacent environments

Applications:

• Industrial power distribution boards requiring a customisable 4-pole main circuit breaker frame
• Main incomer positions in low-voltage switchgear assemblies where the trip unit is specified separately
• Commercial and infrastructure electrical panels operating at 380/415 V or 440 V AC
• Fixed-mounted switchboard installations requiring high short-circuit withstand capability

Compliant with EN/IEC 60947-2 and UL 60947-4-1. Part of the Schneider Electric ComPacT NSX next-generation range.

Also known as: Schneider C25B4, Schneider Electric C25B4, NSX250B 4P frame, ComPacT NSX 250 A basic body.