Intelligent Air Circuit Breaker ACB

Dongfa Intelligent supplies global low voltage power distribution buyers with Intelligent Air Circuit Breaker ACB. This product covers frame sizes from 2000A to 6300A, with rated ultimate short-circuit breaking capacity up to 120kA (400V), equipped with intelligent controllers supporting selective protection, remote communication, and fault recording. Buyers seeking main incoming, bus-tie, or large-capacity feeder protection and control can request a quote for selection support.

Intelligent Controller: How Air Circuit Breakers Achieve Selective Protection

Not Just a Breaker — The "Brain" of Low Voltage Distribution

The biggest difference between intelligent ACBs and MCCBs is the intelligent controller. This product's intelligent controller offers overload long-time delay, short-circuit short-time delay, short-circuit instantaneous, and ground fault protection. By setting different delay curves, ACBs can coordinate with downstream MCCBs, ensuring only the nearest breaker trips during a fault, minimizing outage scope. This is the core value of selective protection — not simply cutting the circuit, but precisely cutting the fault point.

Communication and Metering: Making Distribution Observable

The intelligent controller can be optionally equipped with voltage measurement, energy metering, harmonic analysis, and communication interfaces (Modbus, Profibus, etc.). This means the ACB is not only a protection device but also a data acquisition terminal for the distribution system. O&M personnel can remotely monitor current, voltage, power, and power quality, detecting overload or harmonic issues in advance for preventive maintenance.

Selection Points: Frame Size and Breaking Capacity

This series offers four frame sizes: 2000A, 3200A, 4000A, and 6300A. At 400V, ultimate short-circuit breaking capacity (Icu) is 80kA to 120kA, service short-circuit breaking capacity (Ics) is 65kA to 100kA. At 690V, Icu is 65kA to 75kA. Selection requires confirming system short-circuit capacity, rated current, and intelligent controller function requirements.

Draw-Out vs. Fixed: How Mounting Affects O&M Efficiency

Draw-Out: Fast Replacement, Reduced Downtime

This series supports draw-out mounting. Draw-out ACBs can be racked out or in without removing busbars. When maintenance or replacement is needed, a spare breaker can be quickly racked in, reducing restoration time from hours to minutes. For data centers, hospitals, and continuous production plants where long outages are unacceptable, draw-out is preferred.

Fixed: Simpler Structure, Better Cost

Fixed ACBs are bolted directly into the cabinet, offering simpler structure and lower cost. Suitable for scenarios where outage time for maintenance is sufficient and fast replacement is not required. Selection should balance O&M strategy and budget.

0mm Arc Distance for More Compact Cabinet Design

This Intelligent Air Circuit Breaker ACB series has an arc distance of 0mm. This means when the breaker interrupts short-circuit current, the arc does not eject from the breaker body. Cabinet design requires no additional arc space, helping reduce cabinet size and improve space utilization.

Technical Specifications & Selection Guide

Full Technical Parameters

Core Advantages

High Breaking Capacity Covering Main Distribution Short-Circuit Capacity

At 400V, Icu reaches 120kA and Ics reaches 100kA, effectively clearing huge short-circuit currents on the transformer low voltage side, suitable for buildings, industry, and data centers.

Intelligent Controller for Selective Protection and Remote Communication

Supports overload long-time delay, short-circuit short-time delay, short-circuit instantaneous, and ground fault protection. Optional voltage, energy, harmonic measurement, and Modbus, Profibus communication make distribution observable.

0mm Arc Distance for More Compact Cabinet Design

Arc does not eject from the body during short-circuit interruption. No additional arc space is required, helping reduce cabinet size.

Draw-Out and Fixed Options for Different O&M Strategies

Draw-out supports fast replacement, reducing downtime; fixed offers simpler structure and better cost.

Factory Direct, Better Price at Equivalent IEC Configuration

Dongfa Intelligent factory direct, Yueqing low voltage electrical supply chain, no trader markup. Same GB and IEC 60947 compliance, lower quote than European/US brands, more reliable than local assemblers.

Fast Scheduling, MOQ 1 Unit, 3 Factory Tests

Standard Intelligent Air Circuit Breaker ACB products: 7-15 working days. Custom products: 15-30 working days. Standard products support 1-unit trial order. Every unit must pass mechanical operation test, trip characteristic test, and dielectric withstand test before shipment.

FAQ (Specific to Intelligent Air Circuit Breakers)

Q1: How to choose between an intelligent ACB and an MCCB?

A: By current level and breaking capacity. Choose ACB for frame sizes above 2000A requiring selective protection and intelligent communication; choose MCCB for frame sizes below 1600A with cost sensitivity. ACBs are typically used for main incoming and bus-tie; MCCBs for branch circuits.

Q2: What communication protocols does the intelligent controller support?

A: This series intelligent controller can be optionally equipped with Modbus, Profibus, and other communication interfaces. Specific protocols should be confirmed based on project requirements; we can assist with configuration.

Q3: What is the difference between draw-out and fixed? How to choose?

A: Draw-out supports fast racking out and in, reducing downtime for maintenance or replacement, suitable for data centers, hospitals, etc. Fixed offers simpler structure and lower cost, suitable for scenarios with sufficient outage time.

Q4: What does 0mm arc distance mean?

A: Arc distance is the distance the arc ejects from the breaker body during short-circuit interruption. 0mm means the arc does not eject from the body, so no additional arc space is required in cabinet design, helping reduce cabinet size.

Q5: Are you a factory or a trader? Do you support factory audits?

A: Dongfa Intelligent is an own factory in Yueqing, Zhejiang, founded in 2012, 14 years of manufacturing experience. Factory audits are supported. You are welcome to visit.