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    20 amp 2 pole Miniature Circuit Breaker

    5 out of 5 based on 1 reviews | Write a review
    Miniature circuit breaker with 20 amp, 2 pole, and 230/400V AC 6 kA, are commonly use for branch circuit protection in residential, commercial and industrial fields, with C curve trip characteristic. High quality and good performance.
    SKU: ATO-MCB-2P20
    30-day Returns
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    Delivery date: 6-12 days

    Circuit Breaker Information

    • Rated Current: 20 amp
    • Rated Voltage: 230/400V AC, 50Hz
    • Number of pole: 2 poles
    • 6 kA short circuit breaking capacity
    • Compliance with IEC standard
    • C curve trip characteristic for short circuit and overload protection for different applications

    Technical Data

    Model ATO-NB8-632PC20
    Electrical Parameters Height 86 mm
    Width 18 mm per pole
    Mounting DIN Rail
    Rated Current (In) 20A
    Number of poles 2P
    Rated Voltage (Ue) 230/400V
    Rated Insulation Voltage (Ui) 500V
    Dielectric Test Voltage 2000V
    Rated Frequency 50Hz
    Short Circuit Interrupting Capacity 6KA
    Trip Characteristic C Curve (5-10In)
    Rated Short-Circuit Breaking Capacity 6000A
    Operating Short-Circuit Breaking Capacity 6000A
    Mechanical Parameters Electrical Life 10000 times
    Mechanical Life 20000 times
    Flame Retardant Grade V0
    Protection Degree Direct installation: IP20B
    Installed in the distribution box: IP40B
    Calibration Temperature 30℃
    Operating Temperature -35℃~+70℃
    Storage Temperature -35℃~+85℃
    Tightening Torque 2 N.m
    Max. Tolerable Torque 2.5 N.m
    Terminal Size Acceptability–Min/Max 1 mm2 / 25mm2
    Wire Insertion Depth 13mm

    Circuit Breaker Dimensions (Unit: mm)

    20 amp 2 pole Miniature Circuit Breaker Dimensions


    2 pole Miniature Circuit Breaker Details

    Tips: Arc extinguishing principle of the circuit breaker
    Arc extinguishing is also one of the important applications of the circuit breaker, because arc not only damages the equipment circuit, but also affects human safety. Generally, there are four conventional arc extinguishing means, including the mechanical arc extinguishing, magnetic quenching and so on.

    1. Mechanical arc extinguishing
      The arc is stretched long rapidly through the limitation equipment. Such a means is mostly used in the switch equipment.
    2. Magnetic quenching
      Under an action of the magnetic field generated by the magnetic coil connected with the contact head in series, the arc is pulled long because of the electromagnetic force. It will be blown into the arc extinguishing cover constituted by the solid medium to contact with the solid medium. Then the arc is cooled and extinguished.
    3. Narrow slit (longitudinal slit) arc extinguishing
      Under the electrodynamic force of the magnetic field formed by the arc, the arc will be pulled long and enter into the narrow (longitudinal) slit of the arc extinguishing cover. Several longitudinal slits will cut the arc into several segments and contact with the solid medium directly. As a result, the arc is extinguished soon. Such a structure is mainly used for the AC contactor.
    4. Grid-plate arc extinguishing
      When the contact heads separate, the generated arc will be pushed into a group of metal grids, so as to be cut into several segments under the electrodynamic force. Every piece of mutually insulated metal grid is equivalent to an electrode. Therefore, there are many pressure reductions of positive and negative poles. As to the AC arc, there will be a dielectric strength of 150V~250V approaching to the negative pole when the arc exceeds zero, so that the arc will be extinguished instead of continuing to maintain. Therefore, AC apparatus usually employs the grid-plate arc extinguishing.
    Existing reviews of 20 amp 2 pole Miniature Circuit Breaker
    The circuit breakers work perfect.
    Fast delivery and well packed. I bought three of these for house use. The circuit breakers look very solid. Installation is simple on DIN rail. Work perfect for me.
    From: Tim | Date: 07/11/2018
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