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Schneider Electric C16B4TM125 — Miniature Circuit Breakers (MCB)

Schneider Electric C16B4TM125 ComPacT NSX160B, 125 A, 25 kA

MPNC16B4TM125
Active

Schneider Electric ComPacT NSX series, NSX160B frame, C16B4TM125, 125 A thermal-magnetic circuit breaker, 4-pole, 25 kA Icu at 415 V AC, toggle control.

$298.37 – $810.97Ref. price · indicative, final on quote
Schneider Electric C16B4TM125 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

C16B4TM125 — Identification
ParameterValue
Product nameComPacT NSX
Product rangeComPacT
Product/component typeCircuit breaker
Device applicationDistribution
C16B4TM125 — Ratings
ParameterValue
Rated current (In)125 A at 40 °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
C16B4TM125 — Protection
ParameterValue
Trip unit technologyThermal-magnetic
Earth-leakage protectionWithout
Suitability for isolationYes conforming to EN/IEC 60947-2
Electrical durability (cycles)40000 cycles at 440 V In/2 20000 cycles at 440 V In 15000 cycles at 690 V In/2 7500 cycles at 690 V In
Mechanical durability (cycles)40000 cycles
C16B4TM125 — Mechanical
ParameterValue
Mounting supportBackplate
Control typeToggle
C16B4TM125 — 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 %
C16B4TM125 — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C16B4TM125 — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.7...1 x In
Trip unit protection functionsLI

Product details

The Schneider Electric C16B4TM125 is a ComPacT NSX160B circuit breaker with a 125 A TM-D thermal-magnetic trip unit, rated for distribution duty in 50/60 Hz networks. It carries a 25 kA Icu at 415 V AC (breaking capacity code B), with higher ratings at lower voltages: 40 kA at 240 V, 20 kA at 440 V, and 15 kA at 500 V — all per IEC 60947-2. The thermal-magnetic trip (TM-D) provides L (overload) and I (short-circuit) protection. The 4-pole version (4P) with neutral on the left suits three-phase plus neutral distribution panels.

Front connections top and bottom, with a 35 mm connection pitch. IP40 enclosure protection (indoor panel only; not washdown-rated) and IK07 impact resistance.

Durability and ratings

Mechanical endurance: 40,000 cycles. Electrical endurance varies with load: 40,000 cycles at 440 V at half rated current, 20,000 cycles at full rated current, and 7,500 cycles at 690 V. Overvoltage category III (distribution-level).

Frequently asked questions

What is the breaking capacity of C16B4TM125 at 415 V?

25 kA Icu at 380/415 V AC per IEC 60947-2. At 240 V it is 40 kA, at 440 V it is 20 kA, and at 500 V it is 15 kA.

MPN
C16B4TM125