VCB – Vacuum Circuit Breakers

Vacuum Circuit Breakers (VCBs) are highly effective in interrupting electrical circuits. They function by extinguishing the arc in a vacuum chamber when the contacts separate. Because there is no material in the chamber to sustain the arc, the vacuum circuit breakers excel in high-voltage environments. Typically, VCBs are used in systems with voltage ratings ranging from 6.6kV to 33kV. Consequently, they are ideal for applications where reliable high-voltage performance is crucial.

ACB – Air Circuit Breakers

Air Circuit Breakers (ACBs) serve an essential role in protecting electrical circuits from overcurrent and short-circuits. They are designed to handle currents ranging from 800 Amps to 10K Amps and are commonly used in low-voltage environments with voltages below 450V. ACBs offer significant advantages over other types, including enhanced safety due to the use of air as the quenching medium, which eliminates the fire risk associated with oil-filled breakers. Moreover, ACBs provide rapid current interruption, which helps minimize damage during electrical faults and ensures quick recovery of the system.

MCCB – Molded Case Circuit Breakers

Molded Case Circuit Breakers (MCCBs) are another important type of circuit breaker used for load currents that exceed the capacity of miniature circuit breakers. MCCBs are prevalent in industrial settings, such as panelboards, switchboards, motor control centers, and control panels. Their primary function is to protect electrical circuits from short circuits and overloads through manual switching. MCCBs can detect leakage currents that could lead to electric shocks, and they disconnect the power supply to prevent such hazards. While miniature circuit breakers (MCBs) typically handle currents under 100 amps, MCCBs can manage up to 2500 amps, making them suitable for higher load applications.