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Schneider Electric C25B4TM125C — Miniature Circuit Breakers (MCB)

Schneider Electric C25B4TM125C ComPacT NSX250B MCCB, 125 A,

MPNC25B4TM125C
Active

Schneider Electric ComPacT NSX, NSX250B, MCCB, 125 A, TM-D trip unit, 25 kA Icu at 415 V AC, 4P, toggle control.

Schneider Electric C25B4TM125C datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

C25B4TM125C — Identification
ParameterValue
Product nameComPacT NSX
Product rangeComPacT
Product/component typeCircuit breaker
Device applicationDistribution
C25B4TM125C — Ratings
ParameterValue
Rated current (In)125 A at 50 °C
Poles configuration4P
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
C25B4TM125C — 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
C25B4TM125C — Mechanical
ParameterValue
Mounting supportBackplate
Control typeToggle
C25B4TM125C — 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 %
C25B4TM125C — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C25B4TM125C — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.7...1 x In
Trip unit protection functionsLI

Product details

The 4-pole configuration with neutral left handles three-phase plus neutral distribution, and the toggle control gives a visible break for lockout/tagout. Thermal-magnetic means no auxiliary power needed for the trip function — it's self-powered from the line current, which matters for reliability in panels where control power might be lost. The 140 mm width and 161 mm height fit standard ComPacT NSX cutouts; depth is 86 mm. Front connections top and bottom simplify busbar and cable landing in a distribution panel.

Environmental and compliance profile

IP40 enclosure protection means it's suitable for clean indoor panels, not washdown areas. Electrical durability is rated at 20,000 cycles at 440 V at half rated current, and 10,000 cycles at full rated current. That's typical for a distribution MCCB — not a switching device for frequent motor starts, but fine for infrequent on-load switching and fault protection.

Frequently asked questions

Where can I buy C25B4TM125C and how do I get a price?

This part is sourced to order against an RFQ through independent distribution. Submit a request for quote (RFQ) to confirm current availability and pricing — no stock count or price is published here, but the supply chain is active for this current-lifecycle MCCB.

What is the breaking capacity of C25B4TM125C at 415 V?

The breaking capacity is 25 kA Icu at 380/415 V AC 50/60 Hz per IEC 60947-2. At 220/240 V it's 40 kA Icu, at 440 V it's 20 kA Icu, and at 500 V it's 15 kA Icu.

What compliance documentation does Schneider provide for C25B4TM125C?

The breaker is certified to EN/IEC 60947-2 and rated for isolation per that standard. Pollution degree 3 per IEC 60664-1, overvoltage category III. IP40 per IEC 60529, IK07 per IEC 62262. Standard documentation includes the declaration of conformity to the applicable EU directives.

MPN
C25B4TM125C