Skip to main content
Log in
Schneider Electric C12B4TM125B — Miniature Circuit Breakers (MCB)

Schneider Electric C12B4TM125B ComPacT NSXm MCCB, 125A, 25kA

MPNC12B4TM125B
Active

Schneider Electric ComPacT NSXm, C12B4TM125B, 4P, 125 A at 40 °C, 25 kA 415 V AC, thermal-magnetic trip unit TM-D, EN/IEC 60947-2.

Schneider Electric C12B4TM125B datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

C12B4TM125B — Identification
ParameterValue
Product nameComPacT NSXm
Product rangeComPacT
Product/component typeCircuit breaker
Device applicationDistribution
C12B4TM125B — 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
C12B4TM125B — 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
C12B4TM125B — Mechanical
ParameterValue
Mounting supportBackplate
Control typeToggle
Local signalling/indicationFlag (green) for presence of auxiliary contacts
Number of 9 mm pitches12 module
C12B4TM125B — 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 %
C12B4TM125B — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C12B4TM125B — Electrical
ParameterValue
[Icu] rated ultimate short-circuit breaking capacity50 kA Icu at 220...240 V AC 50/60 Hz conforming to IEC 60947-2 25 kA Icu at 380...415 V AC 50/60 Hz conforming to IEC 60947-2 20 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2
[Ics] rated service short-circuit breaking capacity50 kA at 220...240 V AC 50/60 Hz conforming to IEC 60947-2 25 kA at 380...415 V AC 50/60 Hz conforming to IEC 60947-2 20 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2
C12B4TM125B — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.7...1 x In
Trip unit protection functionsLI

Product details

The thermal-magnetic trip unit (TM-D) provides overload protection via a bimetal strip and short-circuit protection via a solenoid. Category A utilisation means it's not intended for frequent switching of motor loads — it's a distribution breaker, not a motor starter. The IP40 enclosure keeps out tools and small wires but isn't sealed against water — mount it inside a panel.

Deployment context

At 108 mm wide, 137 mm high, and 80 mm deep, it fits standard panel layouts with 12 module pitches of 9 mm. The grey RAL 7016 finish is typical for Schneider's ComPacT range. The toggle control and front-connection terminals make it straightforward for a panel builder to wire and operate. The green flag signals presence of auxiliary contacts — useful for remote status indication.

Frequently asked questions

What is the interrupting rating of C12B4TM125B?

The C12B4TM125B has a 25 kA interrupting capacity at 415 V AC, performance level B, per EN/IEC 60947-2.

What standards does C12B4TM125B comply with?

The C12B4TM125B complies with EN/IEC 60947-2 and is suitable for isolation per that standard. It also meets pollution degree 3 per IEC 60664-1 and IK07 impact resistance per IEC 62262.

How do I get current pricing and availability for C12B4TM125B?

Pricing and availability are confirmed at quote time against an RFQ through independent distribution channels. Submit an RFQ for current pricing and lead time.

MPN
C12B4TM125B