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Schneider Electric C125N42AFM — Miniature Circuit Breakers (MCB)

C125N42AFM ComPacT NS 1250A 4P MCCB, MicroLogic 2.0, 50 kA 4

MPNC125N42AFM
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Schneider Electric ComPacT NS new generation, C125N42AFM, 1250 A at 50 °C, 4P, MicroLogic 2.0 A electronic trip unit, 50 kA Icu at 415 V AC, IP40.

Schneider Electric C125N42AFM datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

C125N42AFM — Identification
ParameterValue
Product nameComPacT NS new generation
Product rangeComPacT
Product range (series)ComPacT NS630b...1600 new generation
Product/component typeCircuit breaker
Device applicationDistribution
C125N42AFM — Ratings
ParameterValue
Rated current (In)1250 A at 50 °C
Breaking capacity85 kA Icu at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 50 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 50 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2 40 kA Icu at 500/525 V AC 50/60 Hz conforming to IEC 60947-2 30 kA Icu at 660/690 V AC 50/60 Hz conforming to IEC 60947-2
Rated service breaking capacity (Ics)50 kA at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 50 kA at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 50 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2 40 kA at 500/525 V AC 50/60 Hz conforming to IEC 60947-2 30 kA at 660/690 V AC 50/60 Hz conforming to IEC 60947-2
Rated operational voltage (Ue)690 V AC 50/60 Hz
Rated insulation voltage (Ui)800 V AC 50/60 Hz conforming to IEC 60947-2
Rated impulse withstand voltage (Uimp)8 kV conforming to IEC 60947-2
Network type (AC/DC)AC
Network frequency50/60 Hz
Utilisation categoryCategory B
Overvoltage categoryIII
C125N42AFM — Protection
ParameterValue
Trip unit technologyElectronic
Earth-leakage protectionWithout
Suitability for isolationYes conforming to EN/IEC 60947-2
Electrical durability (cycles)2000 cycles at 690 V In 3000 cycles at 690 V In/2 4000 cycles at 440 V In 5000 cycles at 440 V In/2
Mechanical durability (cycles)10000 cycles
C125N42AFM — Mechanical
ParameterValue
Mounting supportBackplate
Mounting modeFixed
Control typeManually operated
Local signalling/indication4 LEDs (red) for fault indication 1 LED (yellow) for overload
C125N42AFM — Environmental
ParameterValue
Operating ambient temperature-25...70 °C
Storage ambient temperature-40...85 °C
IP degree of protectionIP40 conforming to IEC 60529
Pollution degree3 conforming to IEC 60947
Relative humidity0...95 %
C125N42AFM — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C125N42AFM — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.4...1 x In
Trip unit protection functionsLI

Product details

The C125N42AFM is a fixed-mount ComPacT NS new generation MCCB from Schneider Electric, rated 1250 A at 50 °C with a MicroLogic 2.0 A electronic trip unit providing L (long-time overload) and I (instantaneous short-circuit) protection per EN/IEC 60947-2. The 4-pole configuration with neutral on the left handles three-phase distribution with a switched neutral. The IP40 enclosure keeps out tools and wires over 1 mm but not moisture, so mount it in a dry indoor panel or a weatherhead-rated enclosure.

Fixed-mount on a backplate (mounting support), with front-facing connections on both the line and load sides — no rear or plug-in base. Dimensions are 327 mm high, 280 mm wide, 147 mm deep, with a 70 mm connection pitch between phases. The LCD display on the front shows real-time current readings (ammeter measurement type), and four red LEDs signal fault types plus one yellow LED for overload. Pollution degree 3 (IEC 60947) means it tolerates conductive dust in industrial environments, but the IP40 rating still calls for a clean panel interior or an additional enclosure for washdown areas.

Frequently asked questions

How do I get current pricing and availability for C125N42AFM?

The C125N42AFM is sourced to order through independent distribution. Submit an RFQ — current pricing and availability are confirmed at quote time.

What is C125N42AFM's breaking capacity at 415 V AC?

50 kA Icu at 380/415 V AC 50/60 Hz per IEC 60947-2. That is the N breaking capacity code — sufficient for most industrial distribution panels at 400 V line voltage.

What compliance documentation does Schneider Electric provide for C125N42AFM?

The MCCB is certified to EN/IEC 60947-2, with IP40 per IEC 60529 and IK07 per EN 50102. Overvoltage category III and pollution degree 3 are listed. RoHS, REACH, and UL documentation are typically included in the manufacturer's compliance pack — request them with your RFQ.

MPN
C125N42AFM