Factory Direct Air Circuit Breakers for Reliable Power Distribution

Dongfa Intelligent supplies global low voltage power distribution buyers with factory-direct Air Circuit Breakers (ACB). ACBs are core protection devices in low voltage main distribution systems, handling main incoming, bus-tie, and large-capacity feeder protection and control.

Unlike MCCBs and MCBs, ACBs have higher frame sizes, stronger breaking capacity, and are typically equipped with intelligent controllers for selective protection, remote communication, and fault recording. Selection requires focusing on frame size, breaking capacity, intelligent controller functions, and mounting method.

How to Choose an Air Circuit Breaker

First confirm system short-circuit capacity and rated current, then select the corresponding breaking capacity (Icu/Ics) and frame size. Dongfa Intelligent's ACBs cover 2000A to 6300A frame sizes, with ultimate short-circuit breaking capacity up to 120kA at 400V and service short-circuit breaking capacity up to 100kA, equipped with intelligent controllers supporting overload long-time delay, short-circuit short-time delay, short-circuit instantaneous, and ground fault protection. Communication interfaces such as Modbus and Profibus are optional, making distribution observable.

Core Product Advantages

GNW1 Series Frame Size Comparison

The table below compares four frame sizes of the GNW1 series. All models are equipped with basic intelligent controllers with optional communication modules.