CHINT NXM‑400S/3300 400A Molded Case Circuit Breaker – 400A, 3‑Pole, 50kA @ 400V, Thermal‑Magnetic Trip Supplier | SIMPLYBUY
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CHINT NXM‑400S/3300 400A Molded Case Circuit Breaker – 400A, 3‑Pole, 50kA @ 400V, Thermal‑Magnetic Trip
CHINT NXM‑400S/3300 400A Molded Case Circuit Breaker – 400A, 3‑Pole, 50kA @ 400V, Thermal‑Magnetic Trip - Image 2
CHINT NXM‑400S/3300 400A Molded Case Circuit Breaker – 400A, 3‑Pole, 50kA @ 400V, Thermal‑Magnetic Trip - Image 3

CHINT NXM‑400S/3300 400A Molded Case Circuit Breaker – 400A, 3‑Pole, 50kA @ 400V, Thermal‑Magnetic Trip

ParameterValue
Product TypeMolded Case Circuit Breaker (MCCB)
Series / BrandNXM (Kunlun) / CHINT Electric
Model NumberNXM‑400S/3300 400A
Frame Size (AF)400 AF
Number of Poles3‑pole (3P)
Rated Current (In)400A
Rated Operational Voltage (Ue)220/230/240V, 380/400/415V AC
Rated Insulation Voltage (Ui)1000V
Rated Impulse Withstand Voltage (Uimp)12kV
Breaking Capacity (Icu) @ 220/230/240V AC75kA
Breaking Capacity (Icu) @ 380/400/415V AC50kA
Trip Unit TypeThermal‑Magnetic (fixed)
Protection FunctionsOverload, short‑circuit
Connection TypeFront‑connection terminals (板前接线)
Maximum Cable Cross‑Section240 mm²
MountingFixed (垂直或水平安装)
Dimensions (W × H × D)140 mm × 257 mm × 160 mm
WeightApprox. 5 kg
Electrical Life8,000 operations (AC415V, In)
Mechanical Life20,000 operations (with maintenance) / 10,000 operations (without maintenance)
Operating Temperature‑35°C to +70°C
Housing MaterialThermosetting plastic, UL94 V‑0 flame retardant
Standards & CertificationsIEC/EN 60947‑2, GB/T 14048.2; CCC, KEMA, CB, NOM
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CHINT NXM‑400S/3300 400A Molded Case Circuit Breaker – 400A, 3‑Pole, 50kA @ 400V, Thermal‑Magnetic Trip

Manufacturer: CHINT Electric
Model: NXM‑400S/3300 400A
Type: Molded Case Circuit Breaker (MCCB)
Series: NXM (Kunlun Series)
Frame Size: 400 AF
Rated Current (In): 400A
Number of Poles: 3‑pole (3P)
Breaking Capacity (Icu @ 400V AC): 50kA
Trip Unit: Thermal‑Magnetic (fixed)
Application: Power distribution, industrial control panels, and commercial building protection

The CHINT NXM‑400S/3300 400A is a high‑performance molded case circuit breaker from the NXM (Kunlun) series, engineered for reliable overload and short‑circuit protection in industrial and commercial power distribution systems. With a 400A frame and a breaking capacity of 50kA at 400V AC (75kA at 240V AC), it delivers robust fault current interruption. The thermal‑magnetic trip unit provides fixed overload protection, while the compact design (140mm × 257mm × 160mm) and front‑connection terminals make it ideal for panel builders seeking a space‑efficient, high‑reliability solution. The NXM series features a thermosetting plastic housing with UL94 V‑0 flame retardant rating, built‑in phase isolation barriers, and compliance with IEC/EN 60947‑2 and CCC standards, suitable for global applications.

  • High Breaking Capacity: Delivers 50kA Icu at 400V AC and 75kA at 240V AC, providing reliable protection under demanding short‑circuit conditions.

  • Thermal‑Magnetic Trip Unit: Fixed thermal‑magnetic protection ensures dependable overload and short‑circuit response for industrial power distribution.

  • Compact & Robust Construction: Space‑saving 140mm width with a thermosetting plastic housing (UL94 V‑0 flame retardant) for excellent heat dissipation and mechanical strength.

  • Built‑in Phase Isolation: Integrated phase isolation barriers enhance safety and reduce the risk of arc faults between phases.

  • Front‑Connection Terminals: Fixed front‑wired terminals support cable cross‑sections up to 240mm², ensuring secure and low‑resistance terminations.

  • Wide Operating Temperature: Reliable performance from ‑35°C to +70°C, suitable for harsh industrial environments.

  • Global Approvals & Compliance: Certified to IEC/EN 60947‑2, CCC, KEMA, CB, and NOM; RoHS compliant.

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