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    Vacuum Circuit Breaker Buying Guide

    With new improvements in vacuum breaker design, vacuum circuit breakers are becoming more common at the lower voltage ranges of transmission networks. Today they can handle voltages up to 252 kV but are still very expensive. Because there is no gas to ionize to form the arc, the insulating gap is smaller than in other circuit breakers. An arc does form from the vaporized contact material. 

    When choosing a vacuum circuit breaker, we need to consider many factors. But the most important thing is to know about vacuum circuit breakers before you can make a choice. The following brief introduction hopes to help you choose the right one.

    Vacuum circuit breaker front and behind

    Important Parameters in the Selection of Vacuum Circuit Breaker:

    • Interrupting Capacity/ KA: It is the maximum current in which the breaker is designed to interrupt safely at a certain voltage.
    • Short Time Settings: It is the characteristic of a circuit breaker to remain closed for a time interval under a range of high fault currents. It is an important factor in achieving selective coordination among circuit breakers.
    • Long Time Settings: It is the setting of the circuit breaker to determine the time duration to allow a certain overload current to flow before tripping.
    • Continuous Amps: It is the current which the device will carry without tripping or overheating.
    • Frame Size: Frame size indicates the physical size of the breaker as well as the maximum continuous current it can tolerate.
    • Rated KV: It indicates the highest system voltage which the circuit breaker can sustain.

    Advantages of Vacuum Circuit Breaker (VCB):

    • Reliable, have longer service life than other types of circuit breakers.
    • It is compact in size.
    • There is no chance of fire hazard.
    • The vacuum has high dielectric strength.
    • No generation of gas after the operation.
    • Silent and less vibrational operation.
    • It can interrupt any fault current.
    • Replacement of vacuum interrupter is much convenient.

    Normally there is one break per phase but there can be two or more interrupters in series for higher voltages. The contact plates are formed to conduct the current in a way that creates a magnetic field that causes the arc to rotate and extinguish. A benefit with a rotating arc is uniform heat distribution resulting in more even contact erosion. Other advantages with vacuum breakers are their relatively long operational life time and their relatively limited impact on the environment since they are designed without greenhouse gases and with relatively few components. Vacuum circuit breakers also suffer less wear on the main contact than air and oil circuit breakers. 

    Vacuum circuit breaker in ATO industrial automation is suitable for indoor use. Various vcb breakers with 11kv, 12kv, 15kv, 25kv, 33kv, 35kv40kv rated voltage are provided in our website. You can simply know the vacuum circuit breaker information through the product details page or contact us.

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