Product Description:
The CHINT NXMLE-250S/4300 250A 4-Pole MCCB is a premium earth leakage molded case circuit breaker designed for full protection in three-phase + neutral (4P) power systems. It features integrated thermal, magnetic, and residual current protection, making it ideal for applications requiring reliable fault isolation, including neutral disconnection.

With a rated current of 250A, this breaker delivers a high breaking capacity of 50kA at 230V and 36kA at 400V, along with adjustable earth leakage sensitivity (100mA / 200mA / 300mA). Built to IEC/EN 60947-2 standards, it is perfect for industrial plants, data centers, backup systems, and commercial installations.

Key Features:

• ✅ Rated Current: 250A

• ✅ Poles: 4P (3-phase + Neutral)

• ✅ Built-in Earth Leakage Protection (ELCB)

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

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

• ✅ Trip Unit: Fixed thermal-magnetic + residual current

• ✅ Push-to-Trip Test Button

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

• ✅ Heavy-Duty Frame: NXMLE-250S/4300

Technical Specifications:

• Model: NXMLE-250S/4300

• Rated Current (In): 250A

• Poles: 4P

• Rated Operational Voltage (Ue): 400V AC

• Rated Insulation Voltage (Ui): 800V

• Rated Impulse Voltage (Uimp): 8kV

• Breaking Capacity (Icu/Ics):

  • 230V: 50kA / 30kA

  • 400V: 36kA / 20kA

• Residual Current Sensitivity (IΔn): Adjustable – 100 / 200 / 300mA

• Frequency: 50Hz / 60Hz

• Trip Curve: Type C

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

• Mounting Type: Fixed, front-connection

Applications:

• 3-phase + Neutral main distribution boards

• Power systems with leakage protection needs

• Data centers and server farms

• Backup power systems (generator outputs)

• Commercial switchgear and building infrastructure

• Transformer outputs requiring full 4-pole isolation