Product Description:
The CHINT NXM-400S/4300 400A 4-Pole MCCB is a powerful molded case circuit breaker engineered for high-load three-phase + neutral systems. With a rated current of 400A and a breaking capacity of 36kA at 400/415V, it provides trusted protection for commercial buildings, industrial panels, data centers, and generator networks.

Built on the robust NXM-400 frame, this MCCB features a fixed thermal-magnetic trip unit that protects against overloads and short circuits. Its 4-pole configuration ensures full disconnection of phases and neutral, offering superior safety and reliability for balanced power systems.

Key Features:

• ✅ Rated Current: 400A

• ✅ Poles: 4P (3-phase + Neutral)

• ✅ Breaking Capacity: 36kA @ 400V

• ✅ Voltage Rating: Up to 800V AC (Ui)

• ✅ Trip Mechanism: Fixed thermal-magnetic

• ✅ Test Function: Push-to-trip button

• ✅ Certifications: IEC/EN 60947-2, CE, KEMA, EAC

• ✅ Rugged NXM-400 Frame Size

Technical Specifications:

• Model: NXM-400S/4300

• Rated Current (In): 400A

• Poles: 4P

• Rated Insulation Voltage (Ui): 800V

• Rated Impulse Voltage (Uimp): 8kV

• Rated Operating Voltage (Ue):

  • 230V: 50kA

  • 400V: 36kA

  • 415V: 36kA

• Breaking Capacity (Icu/Ics):

  • 230/240V: 50kA / 30kA

  • 400/415V: 36kA / 20kA

• Frequency: 50Hz / 60Hz

• Mounting: Fixed (front-connected)

• Operating Temp: -25°C to +70°C

• Trip Unit Type: Thermal-magnetic (non-adjustable)

Applications:

• Industrial switchgear and distribution boards

• Generator output protection

• Commercial building infrastructure

• Neutral-sensitive 3-phase loads

• Main incoming power panels

• HVAC, motor control, and backup systems