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Datasheet generated 2026-10-07
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Schneider Electric Circuit breaker, ComPacT NSX400K, 36KA/800VAC, 10KA/1000VAC, 4 poles, MicroLogic 2.3 trip unit, 400A C40K42D400

Schneider Electric · Electrical Components · Moulded Case Circuit Breakers · France · se.com
Part Number
C40K42D400  ·  HS 8536.90
Schneider Electric Circuit breaker, ComPacT NSX400K, 36KA/800VAC, 10KA/1000VAC, 4 poles, MicroLogic 2.3 trip unit, 400A C40K42D400

Schneider Electric C40K42D400 Circuit breaker ComPacT NSX400K-1000VAC-electronic protection-Micrologic 2.3 250A 4P-10kA/1000VAC.

Technical Specifications

Manufacturer part number (MPN)C40K42D400
EAN / GTIN3606481004864
HS code8536.90
Sales unitpcs
Voltage1000 V AC
Rated current400 A
Number of poles4P
RangeComPacT
Range of productComPact NSX400...630
Device short nameComPacT NSX400K
Product or component typeCircuit breaker
Device applicationSpecial application
Protected poles description3t; 3t + N/2; 4t
Neutral positionLeft
[In] rated current400 A at 40 °C
[Ue] rated operational voltage800...1000 V AC 50/60 Hz
Network typeAC
Network frequency50/60 Hz
Suitability for isolationYes conforming to EN/IEC 60947-2
Utilisation categoryCategory A
[Icu] rated ultimate short-circuit breaking capacity36 kA Icu at 800 V AC 50/60 Hz conforming to IEC 60947-2; 10 kA Icu at 1000 V AC 50/60 Hz conforming to IEC 60947-2
Performance levelK 10 kA 1000 V AC
Trip unit nameMicroLogic 2.3
Trip unit technologyElectronic
Trip unit protection functionsLSoI
Control typeToggle
Circuit breaker mounting modeFixed
[Ui] rated insulation voltage1000 V AC 50/60 Hz
[Uimp] rated impulse withstand voltage8 kV
[Ics] rated service short-circuit breaking capacity10 kA at 800 V AC 50/60 Hz conforming to IEC 60947-2; 10 kA at 1000 V AC 50/60 Hz conforming to IEC 60947-2
Mechanical durability15000 cycles
Electrical durability1000 cycles at 1000 V In
Mounting supportBackplate
Upside connectionFront
Downside connectionFront
Connection pitch45 mm
Protection typeL : for overload protection (long time); So : for short time short-circuit protection with fixed delay; I : for instantaneous short-circuit protection
Trip unit rating400 A at 40 °C
Long-time pick-up adjustment type Ir (thermal protection)Adjustable 9 settings
[Ir] long-time protection pick-up adjustment range160...400 A
Long-time protection delay adjustment type trFixed
[tr] long-time protection delay adjustment range11 s at 7.2 x Ir; 16 s at 6 x Ir; 400 s at 1.5 x Ir
Thermal memory20 minutes before and after tripping
Short-time protection pick-up adjustment type IsdAdjustable 9 settings
[Isd] Short-time protection pick-up adjustment range1.5...10 x Ir
Short-time protection delay adjustment type tsdFixed
Instantaneous protection pick-up adjustment type IiFixed
[Ii] instantaneous protection pick-up adjustment range4800 A
Earth-leakage protectionWithout
Neutral protection settings0.5 x Ir (3t + N/2); 1 x Ir (4t); No protection (3t)
Zone selective interlocking ZSIWithout
Number of slots for electrical auxiliaries6 slot(s)
Local signallingFlashing LED (green) for ready to operate; LED 105 % Ir (red) for overload; LED 90 % Ir (orange) for overload
Width (W)185 mm
Height (H)255 mm
Depth (D)110 mm
Product weight7.9 kg
StandardsEN/IEC 60947
Product certificationsCE; CCC
Electrical shock protection classClass II
Pollution degree3 conforming to IEC 60664-1
IP degree of protectionIP40 conforming to IEC 60529
IK degree of protectionIK07 conforming to IEC 62262
Ambient air temperature for operation-25…70 °C
Ambient air temperature for storage-50…85 °C
Relative humidity0…95 %
Operating altitude0...2000 m without derating; 2000 m...5000 m with derating
Warranty (in months)18

Properties

MOQ1

Cross-References

Attached Documents