1.Application Scope

  • Short-circuit protection
  • Over-load protection
  • Isolation

NDB1-40 dedicated to the low voltage power distribution system of industrial, buildings, energy, communications and infrastructure. The MCB can cut off phase and neutral lines at the same time, whereas the neutral line should not provide protection.


  • 1. Electrical parameters
  • Rated working voltage: AC230V/240V
  • Rated Frequency: 50/60Hz
  • Rated Current: 2A, 4A, 10A, 16A, 20A, 25A, 32A, 40A
  • Rated Breaking Capacity: 6kA
  • Impulse Withstand Voltage: 500V
  • Instantaneous Tripping Characteristics: B,C,D
  • 2. Mechanical and Electriacl Life:
  • Mechanical life: 20000 times
  • Electrical life: 10000 times
  • 3. Isolation function:
  • Practical breaking instructions
  • View window within the green identification said contact in the off position
  • 4.Wiring
  • Tunnel terminals
  • The wiring capacity:1~10m㎡ conducting wire
  • Terminal screw: M4; Recommended tightening torque:1.2N.m
  • 5.Protection Degree:
  • Noumenon protection grade: IP20
  • Install in the distribution box: IP40
  • 6. Tripping curve
  • B type curve
  • Protect the load with small short-circuit current (such as non-inductive or micro-inductive circuit)
  • Rated Current: 2A~40A
  • Tripping characteristic: The instantaeous tripping range 3In~5In
  • C type curve
  • Protect normal load and distribution wire cable
  • Rated Current 2A~40A
  • Tripping characteristics:The instantaeous tripping range 10In~14In
  • D type curve
  • Protect starting current big impact load(Such as motor, transformer)
  • Rated Current 2A~40A
  • Tripping characteristics:The instantaeous tripping range 10In~14In

3.Working Condition:

  • Ambient temperature:-40 ℃~+70 ℃
  • Storage ambient temperature: -40 ℃ ~ +80 ℃
  • Heat and humidity resistance: The relative air humidity ≤95% at the temperature of +55 ℃
  • Altitude:≤2000m , If you need to use at higher altitude, you can refer to the company’s mini-circuit breaker requirements for capacity reduction. It can refer to the technical requirements of GB/T20645 low voltage electric appliance for high altitude under special enironmental condition.
  • Pollution degree: 2
  • Able to be affacted by salt fog and oil mist.
  • In the medium without explosion risk, and the medium is not enough to corrode metal and destroy the insulation of the gas and conductive dust.
  • In places where there is no rain or snow.
咨询产品列表 提交咨询以上产品