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electrical center b2c

CHINT NXB-63 D-Type MCB 6A-125A 1P 2P 3P 4P Motor-Specific Power Circuit Breaker

$19.40 USD
$19.40 USD
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Shipping calculated at checkout.
Number of Pole
Rated Current

Technical Specifications

  • Brand: CHINT
  • Model: NXB-63 D-Type
  • Curve Characteristic: D-Type (10~20In tripping current)
  • Rated Current: 6A~125A
  • Pole Options: 1P, 2P, 3P, 4P
  • Rated Voltage: AC 230V/400V
  • Frequency: 50/60Hz
  • Installation: 35mm Standard DIN Rail
  • Protection Functions: Overcurrent Protection, Short-Circuit Protection
  • Shell Material: Flame-Retardant Insulating Material

Typical Applications

  • Small Motors (6A~25A): Household water pumps, exhaust fans, range hoods, small workshop fans (0.1kW~3kW).
  • Medium Motors (32A~63A): Water pumps, air compressors, fans, mixers (3kW~30kW), central air conditioning compressors, small production line motors.
  • Large Motors (80A~125A): Large air compressors, water pumps, crushers, mixers (30kW~75kW), large-scale conveyor systems, industrial furnaces.
  • Other Scenarios: Industrial power distribution cabinets, commercial electrical systems, auxiliary power protection for motor control circuits.

Selection Tips & Notes

  • Distinguish D-Type & C-Type MCBs: C-type (5~10In tripping) for lighting/household loads; D-type (10~20In tripping) for motors/power loads—misuse causes tripping or protection failure.
  • Current Matching: Select MCB rated current 1.2~2.5 times the motor’s rated current (reserve 20%~100% margin) to withstand startup current impact.
  • Pole Selection: 1P/2P for single-phase motors; 3P/4P for three-phase motors (4P recommended for neutral wire protection).
  • Special Note: For AC loads only; do not use for DC circuits (select dedicated DC circuit breakers). Suitable for industrial, commercial, and motor control scenarios.

Troubleshooting of Common Faults


If a fault occurs, it is recommended to consult an electrician. Do not operate the device by yourself.
Fault Phenomenon Cause Analysis Troubleshooting Method
Cannot Close Short circuit or leakage at the load end Check the load status
Malfunction of the operating mechanism Replace the product
Mismatch between the circuit breaker's rated current and the load current Replace with a product of appropriate specification
Check if the residual current accessory has been reset Press the reset button
High Temperature Loose terminal screws or uncompressed wires Tighten the terminal screws
Selected wire cross-sectional area is too small Replace with a wire of appropriate specification
Mismatch between the circuit breaker's rated current and the load current Replace with a product of appropriate specification
Natural aging of the product, deformation, rust or looseness of components Replace with a new product
Fails to Trip During Short Circuit Malfunction of the product's contact system Replace with a new product
Mismatch between the selected circuit breaker and the load's working conditions Replace with a product of appropriate specification
Too short stripped length of the wire Re-strip the wire
Wire not inserted into the terminal block Re-strip the wire and insert correctly
Possible internal mechanism failure of the product Replace the product


Care Instructions

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