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Schneider Electric C12F4TM125B — Miniature Circuit Breakers (MCB)

Schneider Electric C12F4TM125B ComPacT NSXm Circuit Breaker,

MPNC12F4TM125B
Active

Schneider Electric ComPacT NSXm, C12F4TM125B, 4P thermal-magnetic circuit breaker, 125 A at 40 °C, 36 kA at 415 V AC, EN/IEC 60947-2.

Schneider Electric C12F4TM125B datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

C12F4TM125B — Identification
ParameterValue
Product nameComPacT NSXm
Product rangeComPacT
Product/component typeCircuit breaker
Device applicationDistribution
C12F4TM125B — Ratings
ParameterValue
Rated current (In)125 A at 40 °C
Poles configuration4P
Rated operational voltage (Ue)440 V AC 50/60 Hz
Rated insulation voltage (Ui)800 V AC 50/60 Hz
Rated impulse withstand voltage (Uimp)8 kV
Network type (AC/DC)AC
Network frequency50/60 Hz
Utilisation categoryCategory A
Overvoltage categoryIII
C12F4TM125B — Protection
ParameterValue
Trip unit technologyThermal-magnetic
Earth-leakage protectionWithout
Suitability for isolationYes conforming to IEC 60947-2
Electrical durability (cycles)20000 cycles at 440 V In/2 10000 cycles at 440 V In
Mechanical durability (cycles)20000 cycles
C12F4TM125B — Mechanical
ParameterValue
Mounting supportBackplate
Control typeToggle
Local signalling/indicationFlag (green) for presence of auxiliary contacts
Number of 9 mm pitches12 module
C12F4TM125B — 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 60664-1
Relative humidity0...95 %
C12F4TM125B — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C12F4TM125B — Electrical
ParameterValue
[Icu] rated ultimate short-circuit breaking capacity85 kA Icu at 220...240 V AC 50/60 Hz conforming to IEC 60947-2 36 kA Icu at 380...415 V AC 50/60 Hz conforming to IEC 60947-2 35 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2
[Ics] rated service short-circuit breaking capacity85 kA at 220...240 V AC 50/60 Hz conforming to IEC 60947-2 36 kA at 380...415 V AC 50/60 Hz conforming to IEC 60947-2 30 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2
C12F4TM125B — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.7...1 x In
Trip unit protection functionsLI

Product details

The Schneider Electric C12F4TM125B is a ComPacT NSXm 4-pole thermal-magnetic circuit breaker rated 125 A at 40 °C, with a breaking capacity of 36 kA at 415 V AC (performance level F). It is designed for distribution applications and complies with EN/IEC 60947-2. Pollution degree 3 (IEC 60664-1) confirms it handles conductive contamination typical in industrial enclosures.

Mounts to a backplate in horizontal or vertical orientation (flat on the back). The 4-pole breaker occupies 12 module pitches of 9 mm (108 mm wide). The 35 mm connection pitch with spreaders (27 mm without) matches standard panel busbar layouts. IP40 enclosure protection (IK07 impact resistance) is fine for dry indoor panels but not for washdown environments — keep it inside a sealed cabinet if the area gets hosed. The grey RAL 7016 finish is the standard industrial colour.

Frequently asked questions

How do I get current pricing and availability for C12F4TM125B?

The C12F4TM125B is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quote — submit an RFQ for a firm price and lead time.

MPN
C12F4TM125B