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Schneider Electric C40H31M320 — Miniature Circuit Breakers (MCB)

Schneider Electric C40H31M320 ComPacT NSX400H, 320A, 70kA

MPNC40H31M320
Active

Schneider Electric ComPacT NSX, NSX400H, circuit breaker, 320 A at 65 °C, 70 kA Icu at 415 V AC, 3P, MicroLogic 1.3 M electronic trip unit, motor protection.

$760.33Ref. price · indicative, final on quote
Schneider Electric C40H31M320 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

C40H31M320 — Identification
ParameterValue
Product nameComPacT NSX
Product rangeComPacT
Product/component typeCircuit breaker
Device applicationMotor protection
C40H31M320 — Ratings
ParameterValue
Rated current (In)320 A at 65 °C
Poles configuration3P
Breaking capacity100 kA Icu at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 70 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 65 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2 50 kA Icu at 500 V AC 50/60 Hz conforming to IEC 60947-2 35 kA Icu at 525 V AC 50/60 Hz conforming to IEC 60947-2 20 kA Icu at 660/690 V AC 50/60 Hz conforming to IEC 60947-2 85 kA Icu at 240 V AC 50/60 Hz conforming to UL 60947-4-1 65 kA Icu at 480 V AC 50/60 Hz conforming to UL 60947-4-1 20 kA Icu at 600 V AC 50/60 Hz conforming to UL 60947-4-1
Rated service breaking capacity (Ics)100 kA at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 70 kA at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 65 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2 50 kA at 500 V AC 50/60 Hz conforming to IEC 60947-2 11 kA at 525 V AC 50/60 Hz conforming to IEC 60947-2 10 kA at 660/690 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
C40H31M320 — Protection
ParameterValue
Trip unit technologyElectronic
Earth-leakage protectionWithout
Suitability for isolationYes conforming to EN/IEC 60947-2
Electrical durability (cycles)12000 cycles at 440 V In/2 6000 cycles at 440 V In 6000 cycles at 690 V In/2 3000 cycles at 690 V In
Mechanical durability (cycles)15000 cycles
C40H31M320 — Mechanical
ParameterValue
Mounting supportBackplate
Control typeToggle
Local signalling/indicationFlashing LED (green) for ready to operate
C40H31M320 — 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 %
C40H31M320 — Approvals
ParameterValue
StandardsEN/IEC 60947-2
C40H31M320 — Specifications
ParameterValue
Trip unit protection functionsSI

Product details

Motor protection breaker with MicroLogic 1.3 M

The Schneider Electric C40H31M320 is a ComPacT NSX400H 3-pole circuit breaker rated 320 A at 65 °C, designed specifically for motor protection. Its MicroLogic 1.3 M electronic trip unit provides S (short-time) and I (instantaneous) short-circuit protection curves tailored to motor inrush and starting profiles, so it coordinates with downstream contactors and overloads without nuisance tripping on startup. Breaking capacity is 70 kA Icu at 380/415 V AC (IEC 60947-2), with a high-end 100 kA Icu at 220/240 V AC. At 480 V AC it still delivers 65 kA Icu per UL 60947-4-1, giving solid SCCR headroom for industrial motor branch circuits.

The ComPacT NSX series is Schneider's main installed base for 160–630 A molded-case breakers, so spares and retrofit kits remain widely available through the distribution network.

Electrical durability and isolation

Rated for 12,000 electrical cycles at 440 V In/2 and 6,000 cycles at full 440 V In. Mechanical durability is 15,000 cycles.

Frequently asked questions

What is the breaking capacity of C40H31M320 at 415 V?

70 kA Icu at 380/415 V AC per IEC 60947-2, with 65 kA Icu at 480 V AC per UL 60947-4-1.

What trip unit does C40H31M320 use?

It ships with a MicroLogic 1.3 M electronic trip unit, rated 320 A at 65 °C, providing short-time and instantaneous short-circuit protection for motor loads.

Where can I buy C40H31M320?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
C40H31M320