Air Circuit Breakers

1.What Is An Air Circuit Breakers ?

ACB (also known as frame-type circuit breakers) are large, withdrawable switching devices in low-voltage power distribution systems. They are used to connect and interrupt normal or fault currents, and provide multiple protections such as overload, short-circuit, and under-voltage protection. Their core positioning is the “main protection switch” of the power system, and they are mainly applied in scenarios requiring high-reliability power supply, such as power distribution rooms, data centers, and industrial plants, to protect key power equipment like transformers, generators, busbars, and large motors.

2. What Are The Installation Methods Of Air Circuit Breakers?

The installation methods of ACB are withdrawable type and fixed type respectively.

3.How Air Circuit Breakers Work ？

The working principle of ACB is to monitor the circuit status through current-sensing components, and combine mechanical and electrical control logic to realize the normal connection/disconnection of the circuit, or quickly cut off the current in case of faults (such as overload, short circuit, under-voltage, etc.), so as to protect the safety of the power system and equipment.

4.Applications Of ACB

As the “main protection switch at the trunk line level” in low-voltage power distribution systems, ACB are mainly applied in scenarios requiring large-current switching, high-reliability protection, and flexible operation and maintenance. They mainly cover fields such as power distribution, industrial production, and critical infrastructure. The specific application scenarios are as follows: low-voltage power distribution systems; industrial fields: “power supply and protection for high-power equipment”; critical infrastructure: “high-reliability power supply guarantee”; large commercial and civil buildings: “centralized power supply and hierarchical protection”; and new energy systems: “expansion of DC/low-voltage power distribution protection”.