Schneider C40H31M320 Circuit Breaker, ComPacT NSX400H, 70kA/415VAC, 3P, MicroLog

The Schneider Electric C40H31M320 is a 3-pole ComPacT NSX400H fixed-mounted circuit breaker for motor protection, rated 320 A at 65°C with an ultimate breaking capacity of 70 kA at 380/415 V AC. It is equipped with the Micrologic 1.3 M electronic protection unit providing adjustable short-time and fixed instantaneous overcurrent protection.

Technical specifications:

• Commercial reference: C40H31M320
• Manufacturer: Schneider Electric
• EAN:
• Series / range: ComPacT new generation (Compact NSX)
• Product type: Circuit breaker
• Application: Motor protection
• Number of poles: 3P
• Rated current [In]: 320 A at 65°C
• Rated 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
• Ultimate breaking capacity [Icu]: 100 kA at 220/240 V AC; 70 kA at 380/415 V AC; 65 kA at 440 V AC; 50 kA at 500 V AC; 20 kA at 660/690 V AC (per IEC 60947-2)
• Performance level: H, 70 kA at 415 V AC
• Usage category: Category A
• Network type: AC, 50/60 Hz
• Protection unit: Micrologic 1.3 M, electronic, SI function
• Short-time protection pick-up [Isd]: adjustable, 9 settings, 1600-4160 A
• Instantaneous protection pick-up [Ii]: fixed, 4800 A
• Differential protection: none
• Mounting mode: fixed, back plate
• Handle position: horizontal and vertical
• Connection: front terminals (upper and lower), 45 mm
• Slots for electrical auxiliaries: 6
• Mechanical durability: 15,000 cycles
• Power dissipation per pole: 12.29 W
• Dimensions (WxHxD): 140 x 255 x 110 mm
• Weight: 6.05 kg
• IP rating: IP40 (IEC 60529)
• IK rating: IK07 (IEC 62262)
• Operating temperature: -25 to 70°C
• Storage temperature: -50 to 85°C
• Relative humidity: 0-95%
• Operating altitude: up to 2000 m without derating; up to 5000 m with derating
• Pollution degree: 3 (IEC 60664-1)
• Standard: EN/IEC 60947-2

Features and benefits:

• Micrologic 1.3 M electronic protection unit with 9-position adjustable short-time threshold (1600-4160 A) and fixed instantaneous protection at 4800 A enables precise coordination in motor circuits.
• Breaking capacity of up to 100 kA at 240 V AC handles severe fault levels in demanding high-power industrial installations.
• Six accessory slots allow flexible integration of signalling contacts, auxiliary switches, and monitoring devices without additional hardware.
• Operating range of -25 to 70°C supports deployment in challenging ambient conditions across industrial and process environments.
• Front connection terminals on both upper and lower sides and flat-on-back mounting option simplify panel assembly and wiring.

Applications:

• Motor protection in motor control centres and industrial switchboards up to 690 V AC.
• Short-circuit and overload protection in high-power distribution panels in manufacturing and heavy industry.
• Protection of electrical installations in process automation and industrial switchgear assemblies.
• Installations requiring selective coordination with upstream and downstream protective devices.

Compliant with EN/IEC 60947-2. Part of the Schneider Electric ComPacT new generation range.

Also known as: Schneider C40H31M320, Schneider Electric C40H31M320, NSX400H 320A motor protection circuit breaker, ComPacT NSX400H 3P breaker.