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Schneider Electric C40F4TM320D — Miniature Circuit Breakers (MCB)

Schneider Electric C40F4TM320D ComPacT NSX DC 320A 36kA DC C

MPNC40F4TM320D
Active

Schneider Electric ComPacT NSX DC, C40F4TM320D, 4-pole circuit breaker, 320 A at 40 °C, 36 kA Icu at 750 V DC, thermal-magnetic TM-DC trip unit, IP40, fixed mount.

$1,242.38 – $1,425.06Ref. price · indicative, final on quote
Schneider Electric C40F4TM320D datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

C40F4TM320D — Identification
ParameterValue
Product nameComPacT NSX DC
Product rangeComPacT
Product/component typeCircuit breaker
Device applicationDistribution
C40F4TM320D — Ratings
ParameterValue
Rated current (In)320 A at 40 °C
Poles configuration4P
Breaking capacity36 kA Icu at 24...125 V DC 1 pole conforming to IEC 60947-2 36 kA Icu at 250 V DC 1 pole conforming to IEC 60947-2 36 kA Icu at 500 V DC 2 poles in series conforming to IEC 60947-2 36 kA Icu at 750 V DC 3 poles in series conforming to IEC 60947-2
Rated service breaking capacity (Ics)36 kA at 24...125 V DC conforming to IEC 60947-2 36 kA at 250 V DC conforming to IEC 60947-2 36 kA at 500 V DC conforming to IEC 60947-2 36 kA at 750 V DC conforming to IEC 60947-2
Rated operational voltage (Ue)750 V DC
Rated insulation voltage (Ui)750 V DC conforming to IEC 60947-2
Rated impulse withstand voltage (Uimp)8 kV conforming to IEC 60947-2
Network type (AC/DC)DC
Utilisation categoryCategory A
C40F4TM320D — Protection
ParameterValue
Trip unit technologyThermal-magnetic
Earth-leakage protectionWithout
Suitability for isolationYes conforming to EN/IEC 60947-2
Electrical durability (cycles)2000 cycles at 750 V In/2 1000 cycles at 750 V In
Mechanical durability (cycles)5000 cycles
C40F4TM320D — Mechanical
ParameterValue
Mounting supportBackplate
Control typeToggle
C40F4TM320D — 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 %
C40F4TM320D — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C40F4TM320D — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.7...1 x In
Trip unit protection functionsLI

Product details

DC distribution breaker for 750 V rail protection

It delivers 36 kA Icu breaking capacity at 750 V DC with three poles in series, per EN/IEC 60947-2 — enough to clear a hard fault on a 750 V DC bus without cascading upstream. The 4D protected-pole configuration (four poles, all DC-rated) makes it a straight fit for ungrounded DC distribution in industrial switchgear, UPS output feeders, or traction battery banks.

Above 40 °C, derate per the IEC 60947-2 thermal curve (the spec table notes derating above 2000 m altitude). The TM-DC trip unit combines a thermal bimetal for overload protection (L) and a magnetic coil for short-circuit protection (I) — no electronic adjustments, so set the magnetic pickup at the factory-calibrated threshold.

Mounting and enclosure integration

Fixed-mount on a backplate, 185 mm wide, 255 mm high, 110 mm deep — the 45 mm pole pitch matches standard busbar or cable-finger layouts. Front connections top and bottom simplify panel wiring. Horizontal or vertical mounting allowed; flat on the back. IK07 impact rating handles incidental tool drops during commissioning.

Frequently asked questions

How do I get current pricing and availability for C40F4TM320D?

Submit an RFQ through this listing. The part is sourced to order through independent distribution; pricing and stock status are confirmed at quote time.

What is C40F4TM320D's breaking capacity at 750 V DC?

36 kA Icu with three poles in series, conforming to IEC 60947-2. That is the maximum fault current it can safely interrupt at 750 V DC.

What compliance documentation does this brand provide for C40F4TM320D?

The breaker is certified to EN/IEC 60947-2 and carries an IP40 rating per IEC 60529, IK07 per IEC 62262, and pollution degree 3 per IEC 60664-1. It is suitable for isolation per EN/IEC 60947-2. Standard Schneider Electric declarations (CE, UKCA) apply for the ComPacT NSX DC range.

MPN
C40F4TM320D