Product Description:
The CHINT NXMLE-400S/4300 400A 4-Pole MCCB is a high-capacity molded case circuit breaker with built-in earth leakage (RCD/ELCB) protection, engineered for critical 3-phase + Neutral (4P) power systems. With its adjustable leakage sensitivity (100mA, 200mA, 300mA) and breaking capacity of 50kA at 230V / 36kA at 400V, this breaker is ideal for large industrial and commercial environments where full-phase and neutral safety is essential.

Designed on the NXMLE-400S/4300 frame, this 4-pole MCCB provides thermal, magnetic, and residual current protection in one integrated unit, simplifying installation and increasing protection reliability in fault-sensitive environments.

Key Features:

• ✅ Rated Current: 400A

• ✅ Poles: 4P (Three-phase + Neutral)

• ✅ Earth Leakage Protection: Built-in ELCB function

• ✅ Adjustable Sensitivity: 100mA / 200mA / 300mA

• ✅ Breaking Capacity: 50kA @ 230V / 36kA @ 400V

• ✅ Trip Unit: Fixed thermal-magnetic + residual current (non-adjustable)

• ✅ Test Button: Manual push-to-trip

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

• ✅ Frame: NXMLE-400S – Heavy-duty, high-interrupting

Technical Specifications:

• Model: NXMLE-400S/4300

• Rated Current (In): 400A

• Poles: 4P

• Rated Operating Voltage (Ue): 400V AC

• Rated Insulation Voltage (Ui): 800V

• Rated Impulse Withstand Voltage (Uimp): 8kV

• Breaking Capacity (Icu/Ics):

  • 230V: 50kA / 30kA

  • 400V: 36kA / 20kA

• Residual Current Trip Settings (IΔn): 100 / 200 / 300mA (adjustable)

• Trip Curve: Type C

• Frequency: 50Hz / 60Hz

• Mounting Type: Fixed (front connection)

• Operating Temperature: -25°C to +70°C

Applications:

• Main incoming panels with neutral disconnection

• Large commercial buildings and mixed-use facilities

• Generator and transformer output protection

• Industrial plant switchboards

• Critical load systems with leakage risk

• Backup power and energy infrastructure