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Schneider Electric C12E4TM125B — Miniature Circuit Breakers (MCB)

Schneider Electric C12E4TM125B ComPacT NSXm Circuit Breaker,

MPNC12E4TM125B
Active

Schneider Electric ComPacT NSXm, 4P, 125 A, 16 kA 415 V AC, thermal-magnetic, IP40, grey (RAL 7016).

Schneider Electric C12E4TM125B datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

C12E4TM125B — Identification
ParameterValue
Product nameComPacT NSXm
Product rangeComPacT
Product/component typeCircuit breaker
Device applicationDistribution
C12E4TM125B — 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
C12E4TM125B — 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
C12E4TM125B — Mechanical
ParameterValue
Mounting supportBackplate
Control typeToggle
Local signalling/indicationFlag (green) for presence of auxiliary contacts
Number of 9 mm pitches12 module
C12E4TM125B — 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 %
C12E4TM125B — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C12E4TM125B — Electrical
ParameterValue
[Icu] rated ultimate short-circuit breaking capacity25 kA Icu at 220...240 V AC 50/60 Hz conforming to IEC 60947-2 16 kA Icu at 380...415 V AC 50/60 Hz conforming to IEC 60947-2 10 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2
[Ics] rated service short-circuit breaking capacity25 kA at 220...240 V AC 50/60 Hz conforming to IEC 60947-2 16 kA at 380...415 V AC 50/60 Hz conforming to IEC 60947-2 10 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2
C12E4TM125B — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.7...1 x In
Trip unit protection functionsLI

Product details

125 A, 16 kA — panel integration note

The 4P configuration (switched neutral left) suits three-phase + N distribution boards where the neutral must be protected.

IP40 front face keeps out tools and wires ≥1 mm; IK07 impact resistance handles accidental tool drops during commissioning. The lifecycle status is current — this is an active catalogue item, not a phase-out or NRND line.

Mounts flat on a backplate (horizontal or vertical), 12-module 9 mm pitch width (108 mm wide, 137 mm high, 80 mm deep). Connection terminals accept compression lugs or busbars, with a 35 mm pitch when using spreaders, 27 mm without. The toggle control is manual; auxiliary contact presence is indicated by a green flag.

Durability and environment

Electrical endurance: 20,000 cycles at 440 V at In/2, 10,000 cycles at 440 V at In. Mechanical durability matches at 20,000 cycles. Relative humidity range 0–95 % non-condensing. Overvoltage category III — suitable for fixed-installation distribution boards downstream of the main incoming supply.

Frequently asked questions

Who supplies C12E4TM125B and how is it quoted for volume purchases?

C12E4TM125B is sourced through independent distribution channels and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time.

What is C12E4TM125B's listed range?

The range is ComPacT, specifically the ComPacT NSXm series — a compact moulded-case circuit breaker family for distribution applications.

What compliance documentation does this brand provide for C12E4TM125B?

The breaker is certified to EN/IEC 60947-2, carries IP40 and IK07 ratings, and is suitable for isolation per IEC 60947-2. Standard Schneider Electric documentation includes a declaration of performance and CE marking; specific RoHS/REACH declarations are available on request.

MPN
C12E4TM125B