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JCB3-63DC Miniature Circuit Breaker 1000V DC


JCB3-63DC Miniature Circuit Breaker 1000V DC

Miniature circuit breakers designed for DC voltage provide necessary protection in various applications, especially in communication systems and photovoltaic (PV) DC systems. Featuring a unique safety-focused design, these circuit breakers provide reliable short circuit and overload protection, ensuring the integrity of the electrical systems they protect.

With breaking capacities up to 6kA, these DC rated circuit breakers are capable of handling high levels of electrical stress and are suitable for harsh environments. The inclusion of a contact indicator enhances safety and convenience, providing visual confirmation of circuit breaker status.

With current ratings up to 63A and voltage ratings up to 1000V DC, these circuit breakers provide flexibility and compatibility with a variety of DC supply systems. In addition, the availability of 1-pole, 2-pole, 3-pole and 4-pole configurations ensures that these circuit breakers can meet different installation requirements.

These miniature circuit breakers comply with the IEC 60898-1 standard and comply with international quality and safety regulations, ensuring their reliability and performance. Whether used in communications systems or photovoltaic DC systems, these circuit breakers are critical components in ensuring the safe and efficient operation of DC power applications.


    The JCB3-63DC miniature DC circuit breaker is an essential component for solar/photovoltaic systems, energy storage and other DC applications. It is specifically designed to be placed between the battery and hybrid inverter, providing reliable protection and security to the entire system.
    JCB3-63DC DC circuit breaker is equipped with advanced arc extinguishing and flash barrier technology to ensure fast and safe interruption of current. Its protective functions include thermal and electromagnetic releases, available in 1-, 2-, 3- and 4-pole versions with a switching capacity of 6kA (according to IEC/EN 60947-2). The DC rated voltage of each pole is 250V, the maximum rated voltage is 1000V DC, and it has a wide range of applications.
    With current ratings ranging from 2A to 63A, JCB3-63DC circuit breakers offer enhanced functionality, improved connectivity, superior performance and higher levels of safety. Its breaking capacity of up to 6kA ensures reliable protection against fault currents.
    In addition, the JCB3-63DC DC circuit breaker can be securely locked in the OFF position using a padlock device, providing an additional safety measure when disassembling the PV inverter. It is also capable of detecting and protecting bidirectional currents, ensuring total safety of the entire installation.
    In order to further improve safety, it is recommended that circuit breakers be used in conjunction with additional protection devices, such as AC side leakage protection devices, DC side fault channel detectors (insulation monitoring devices), ground protection circuit breakers, etc. DC side. Quick action on site is crucial to clear any faults, as protection may not be ensured in the event of a double fault.
    It is worth noting that the JCB3-63DC DC circuit breaker is not polarity sensitive, allowing the (+) and (-) lines to be reversed without any risk. In addition, it is equipped with three interpole barriers to increase the isolation distance between two adjacent connectors, further enhancing the safety and reliability of the entire system.

    Product Description


    The most important features

    The JCB3-63DC circuit breaker for DC applications has a range of important features that make it a reliable and versatile choice for a variety of systems. Its non-polarized, easy-to-wire design simplifies installation and maintenance, while its high voltage rating of up to 1000V DC ensures compatibility with a wide range of applications.
    The JCB3-63DC circuit breaker has a rated switching capacity of 6 kA (in compliance with IEC/EN 60947-2), an insulation voltage Ui of 1000V, and a rated impulse withstand voltage Uimp of 4000V, providing strong protection and durability. Its Class 3 current limiting and highly selective backup fuses further enhance its safety features due to low let-through energy.
    The contact position indicator with red and green lights provides clear visual feedback on the status of the circuit breaker, adding extra convenience and safety.  JCB3-63DC circuit breakers are available in 1-, 2-, 3- and 4-pole configurations with current ratings up to 63 A, providing the flexibility to meet a variety of system requirements.
    Additionally, its compatibility with PIN or forked standard busbars and its specific design for solar, photovoltaic, energy storage and other DC applications make it a versatile and reliable option for a variety of installations. Together, these features make the JCB3-63DC circuit breaker a comprehensive and reliable solution for DC circuit protection needs.


    Technical Data

     JCB3-63DC circuit breakers adhere to the highest standards, including IEC60947-2 and EN60947-2, ensuring their reliability and performance. The rated current range is wide, from 2A to 63A, to meet various system requirements. The rated working voltage varies according to the number of poles, including 1P DC250V, 2P DC500V, 3P DC750V, and 4P DC1000V, providing flexibility for different applications.
     It has a rated breaking capacity of 6kA, pollution degree 2 and a rated impulse withstand voltage of 4kV, proving its robustness and ability to withstand harsh conditions.  JCB3-63DC circuit breaker has B-curve and C-curve thermal magnetic release characteristics to meet different usage needs.
     With a mechanical life of 20,000 operations and an electrical life of 1500 operations, this circuit breaker offers long-term reliability and durability. Its protection level is IP20 and the ambient temperature range is -5℃ to +40℃, ensuring that it is suitable for a wide range of environments.
     Contact position indicators, green for closed and red for open, provide clear visual feedback on the status of the circuit breaker. Terminal connection types include cable and pin busbars for flexible installation. The circuit breaker can be easily mounted on DIN rail EN 60715 (35mm) using a quick clamp device with a recommended torque of 2.5Nm, ensuring safe and efficient installation.

    Standard IEC/EN 60898-1  IEC/EN 60947-2

    Electrical features

    Rated current In (A) 1, 2, 3, 4, 6, 10, 16,
    20, 25, 32, 40, 50, 63,80
    Poles 1P, 1P+N, 2P, 3P, 3P+N, 4P 1P, 2P, 3P, 4P
    Rated voltage Ue(V) 230/400~240/415
    Insulation voltage Ui (V) 500
    Rated frequency 50/60Hz
    Rated breaking capacity 10 kA
    Energy limiting class 3  
    Rated impulse withstand voltage(1.2/50) Uimp (V) 4000
    Dielectric test voltage at ind. Freq. for 1 min (kV) 2
    Pollution degree 2
    Power loss per pole Rated current (A)
    1, 2, 3, 4, 5, 6, 10,13, 16, 20, 25, 32,40, 50, 63, 80
    Thermo-magnetic release characteristic B, C, D 8-12In, 9.6-14.4In

    Mechanical features

    Electrical life 4, 000
    Mechanical life 20, 000
    Contact position indicator Yes
    Protection degree IP20
    Reference temperature for setting of thermal element(℃) 30
    Ambient temperature (with daily average ≤35℃) -5...+40
    Storage temperation (℃) -35...+70
    Installation Terminal connection type Cable/U-type busbar/Pin-type busbar
    Terminal size top/bottom for cable 25mm2  / 18-4 AWG
    Terminal size top/bottom for Busbar 10mm2  / 18-8 AWG
    Tightening torque 2.5 N*m  /  22 In-Ibs.
    Mounting On DIN rail EN 60715 (35mm) by means of fast clip device
    Connection From top and bottom


    Auxiliary contact Yes
    Shunt release Yes
    Under voltage release Yes
    Alarm contact Yes

    Reliable cable protection

    MCBs protect cables against damage due to overload and short circuits: In the event of dangerously high currents, the circuit breaker’s bimetallic thermal release will disconnect the power supply. In the event of a short circuit, the electromagnetic release will disconnect the power supply in a timely manner

    MCCB Production Line Real Showing

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