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    300A DC Circuit Breaker, 3 Pole

    5 out of 5 based on 1 reviews | Write a review
    Lower price 300A DC circuit breaker with 20 ms total break time for sale online. Working temperature of smart circuit breaker between -25℃ and 50 ℃. PV DC circuit breaker is commonly used in power transfer switch, overload protection device and control appliance.
    SKU: ATO-DCCB-300A
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days

    3 pole circuit breaker is available for installation in standard busbars. DC circuit breaker has overload long delay protection and short-circuit instantaneous protection functions.


    • Extremely high breaking capacity and current limiting characteristics.
    • Available for installation in standard busbars.
    • Dual function terminals on top and bottom sides (lifting type / open type).
    • Optionally fixed to the bus bar on the top or bottom side.
    • With isolation function, can be used as the main switch.
    • Wiring terminal guidance to prevent mis-wiring.


    Electrical Parameter Model FXBN1/BM1-300A
    Current 300A
    Rated Voltage DC 750V
    Current Shell Frame 400A
    Numbers of Pole 3 pole
    Breaking Capacity 25 KA
    Rated Insulation Voltage 1000V
    Rated Impulse Withstand Voltage 8 kV
    Total Break Time 20 ms
    Installation Location any location
    Allowable Ambient Temperature -25 ℃ ~ 50 ℃
    Protection Level IP20
    Avaliable with Accessories auxiliary, alarm, diverter, manual operation, elecrtic operation, mechanical interlock
    Flying Arc Distance ≥50 mm
    Instantaneous Action Valve 12 ln
    Installation Method fixed, insertion type
    Standard IEC60947-2x IEC60947-K GB14048.R GB14048.2
    Machinery Parameter Mounting Method IEC standard track 35 mm
    Enclosure Protection Level IP20
    Dual Function Terminals on Both Sides open type / lifting type
    Terminal Protection finger touch and hand touch safety
    Terminal Wiring Capacity 1-25 mm²
    Termianal Screw Tightening Torque 2-2.4 Nm
    Bus Bar Thickness 0.8-2 mm
    Mounting Angle functionaity is independent of location

    Dimension (Unit: mm)

    300A 3P/4P DC circuit breaker dimension

    Note: If you need copper busbar parts, please contact us.

    Wiring Diagram

    3 pole DC circuit breaker wiring diagram


    300A DC Circuit Breaker Details

    Tips: The Importance of DC Circuit Breaker For Solar Photovoltaic Panel

    DC circuit breaker is critical in solar photovoltaic panel system. Circuit for solar panel is a pricey component of the system. As a result, it is vital to safeguard them using a DC circuit breaker. You can connect the solar pv system panels' circuits to a combiner box. The DC circuit breaker also protects the circuits and boards.

    Existing reviews of 300A DC Circuit Breaker, 3 Pole
    Use in my kitchen
    I bought to install a dedicated circuit for my welder, power tools since my only amp breakers are in the kitchen. This 300A DC circuit breaker works as it should, and I am happily running my welder without tripping breakers.
    From: Matte | Date: 13/12/2022
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