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Schneider Electric C25B3TM125C — Miniature Circuit Breakers (MCB)

C25B3TM125C ComPacT NSX250B 125A 25kA 415V MCCB

MPNC25B3TM125C
Obsolete

Schneider Electric ComPacT NSX250B, C25B3TM125C, 125A thermal-magnetic MCCB, 3-pole, 25 kA at 415 V AC, toggle control.

Schneider Electric C25B3TM125C datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

C25B3TM125C — Identification
ParameterValue
Product nameComPacT NSX
Product rangeComPacT
Product/component typeCircuit breaker
Device applicationDistribution
C25B3TM125C — Ratings
ParameterValue
Rated current (In)125 A at 50 °C
Poles configuration3P
Breaking capacity40 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 15 kA Icu at 500 V AC 50/60 Hz conforming to IEC 60947-2
Rated service breaking capacity (Ics)40 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 15 kA at 500 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
Rated impulse withstand voltage (Uimp)8 kV
Network type (AC/DC)AC
Network frequency50/60 Hz
Utilisation categoryCategory A
Overvoltage categoryIII
C25B3TM125C — Protection
ParameterValue
Trip unit technologyThermal-magnetic
Earth-leakage protectionWithout
Suitability for isolationYes conforming to EN/IEC 60947-2
Electrical durability (cycles)20000 cycles at 440 V In/2 10000 cycles at 440 V In 10000 cycles at 690 V In/2 5000 cycles at 690 V In
Mechanical durability (cycles)20000 cycles
C25B3TM125C — Mechanical
ParameterValue
Mounting supportBackplate
Control typeToggle
C25B3TM125C — 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 %
C25B3TM125C — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C25B3TM125C — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.7...1 x In
Trip unit protection functionsLI

Product details

The C25B3TM125C is a Schneider Electric ComPacT NSX250B moulded-case circuit breaker, 3-pole, rated 125 A at 50 °C with a TM-D thermal-magnetic trip unit. Its breaking capacity is 25 kA Icu at 380/415 V AC 50/60 Hz per IEC 60947-2, with a code B rating (25 kA at 415 V). The TM-D trip gives you fixed thermal (L) overload protection and fixed magnetic (I) short-circuit protection — no adjustment dials. At 125 A and 50 °C ambient, it's sized for a downstream load like a sub-distribution board or a large motor control centre feeder.

The 105 mm width, 161 mm height, and 86 mm depth fit standard distribution board cutouts. Front connections top and bottom simplify busbar and cable routing. IP40 enclosure protection keeps dust out; IK07 impact rating handles incidental contact in a panel.

Frequently asked questions

What are the key ratings for C25B3TM125C?

Rated 125 A at 50 °C with a TM-D thermal-magnetic trip. Breaking capacity is 25 kA Icu at 380/415 V AC, 40 kA at 220/240 V, and 20 kA at 440 V, all per IEC 60947-2. It is a 3-pole device with toggle control.

MPN
C25B3TM125C