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Schneider Electric C125H320FM — Miniature Circuit Breakers (MCB)

Schneider Electric C125H320FM ComPacT NS Circuit Breaker, 12

MPNC125H320FM
Active

Schneider Electric ComPacT NS new generation, C125H320FM, 3P circuit breaker, 1250 A, MicroLogic 2.0 trip unit, 70 kA Icu at 415 V AC, fixed mount.

$2,536.68Ref. price · indicative, final on quote
Schneider Electric C125H320FM datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

C125H320FM — Identification
ParameterValue
Product nameComPacT NS new generation
Product rangeComPacT
Product range (series)ComPacT NS630b...1600 new generation
Product/component typeCircuit breaker
Device applicationDistribution
C125H320FM — 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 70 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 65 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2 50 kA Icu at 500/525 V AC 50/60 Hz conforming to IEC 60947-2 42 kA Icu at 660/690 V AC 50/60 Hz conforming to IEC 60947-2
Rated service breaking capacity (Ics)52 kA at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 52 kA at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 48 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2 37 kA at 500/525 V AC 50/60 Hz conforming to IEC 60947-2 31 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
C125H320FM — 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
C125H320FM — Mechanical
ParameterValue
Mounting supportBackplate
Mounting modeFixed
Control typeManually operated
Local signalling/indication4 LEDs (red) for fault indication 1 LED (yellow) for overload
C125H320FM — Environmental
ParameterValue
Operating ambient temperature-25...70 °C
Storage ambient temperature-50...85 °C
IP degree of protectionIP40 conforming to IEC 60529
Pollution degree3 conforming to IEC 60947
Relative humidity0...95 %
C125H320FM — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C125H320FM — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.4...1 x In
Trip unit protection functionsLI

Product details

The C125H320FM is a Schneider Electric ComPacT NS new generation 3-pole circuit breaker rated 1250 A at 50 °C, fitted with a MicroLogic 2.0 electronic trip unit. The 2.0 provides L (long-time overload) and I (instantaneous short-circuit) protection — no ground-fault element.

Breaking capacity — what the H code means for your fault level

At 220/240 V AC it delivers 85 kA Icu; at 440 V AC it is 65 kA Icu; at 500/525 V AC it is 50 kA Icu; and at 660/690 V AC it is 42 kA Icu. All figures are per IEC 60947-2. For a 415 V panel with a transformer rating above 2 MVA, 70 kA Icu gives headroom over a typical 50 kA fault-current spec — no need to cascade or current-limit upstream.

Installation and environment constraints

Fixed-mount on a backplate, with front connections both top and bottom. Connection pitch is 70 mm. The breaker is IP40 rated (finger-safe, not washdown) and carries an IK07 impact rating. Operating altitude is 0–2000 m without derating; derate above that. Overvoltage category III suits fixed-installation distribution panels.

Durability and thermal behaviour

Mechanical durability is 10,000 cycles. The MicroLogic 2.0 trip unit includes a 20-minute thermal memory — after a trip, the breaker remembers the thermal state of the conductors for 20 minutes, preventing immediate re-closure onto a still-hot circuit. Power losses at rated current are 44 W.

Frequently asked questions

How do I get current pricing and availability for C125H320FM?

Submit an RFQ against this order code. The part is sourced through independent distribution; availability and current pricing are confirmed at quote time.

What is the closest alternative to C125H320FM in the ComPacT family?

Within the same ComPacT NS630b...1600 new generation range, the closest alternative would be a variant with a different trip unit rating or breaking capacity code. The C125H320FM is a 1250 A, 70 kA at 415 V AC configuration with a MicroLogic 2.0 trip unit. A direct replacement would share the same frame size and trip unit technology.

What is C125H320FM's listed range?

The C125H320FM belongs to the ComPacT NS630b...1600 new generation range, part of the broader ComPacT family.

What is C125H320FM's listed depth?

The depth is 147 mm.

What compliance documentation does this brand provide for C125H320FM?

The breaker is certified to EN/IEC 60947-2 and carries an IP40 rating per IEC 60529 and IK07 per EN 50102. It is suitable for isolation per EN/IEC 60947-2. For RoHS, REACH, and UL documentation, refer to the manufacturer's compliance declarations for the ComPacT NS new generation series.

MPN
C125H320FM