01-08-2025
Typical type tests for ACB according to IEC 60947-2
An ACB (Air Circuit Breaker) is an air-type circuit breaker used to protect electrical systems from overloads, short circuits, and in some cases, phase loss, undervoltage, or leakage currents. ACBs can handle higher current ratings than MCCBs, typically ranging from 630A to 6300A, making them suitable for low-voltage electrical systems in industrial and commercial applications.
Applicable Standards for ACB
ACBs are manufactured according to specific standards to ensure safety and operational efficiency. Commonly applied standards include:
- IEC 60947-2: International standard for low-voltage switchgear and controlgear.
- EN 60947-2: European standard for low-voltage circuit breakers.
- UL 489: American safety standard for circuit breakers.
Most ACB manufacturers comply with IEC 60947-2 and may also adhere to national or regional standards if required. IEC 60947-2 defines performance, testing, and safety requirements for ACBs in low-voltage systems (≤1000V AC or ≤1500V DC), covering key parameters such as rated current (In), short-circuit breaking capacity (Icu, Ics), and overload protection.
Typical Type Tests for ACB According to IEC 60947-2
To ensure quality and safety, ACBs must pass the following type tests in accredited laboratories:
- Temperature rise test
- Operational limits and characteristic performance tests
- Dielectric properties test
- Mechanical operation capability test
- Overload characteristics test
- Short-circuit breaking capacity test
- Short-time withstand current test
- Coordination capability between fuses and ACB
Reputable Testing Laboratories for ACB
Globally recognized laboratories that test and certify ACBs include leading organizations in electrical and electronic product evaluation. Some trusted laboratories and certification bodies include:
- KEMA (DEKRA Certification) – Netherlands
- Intertek (ETL) – Global
- UL (Underwriters Laboratories) – USA
- VDE (Verband der Elektrotechnik) – Germany
- TÜV Rheinland – Germany
ACBs (Air Circuit Breakers) are critical protection devices in low-voltage electrical systems, ensuring safety against faults such as overloads, short circuits, phase loss, and undervoltage. With their high current handling capacity, ACBs are commonly used in main distribution panels, industrial power distribution systems, and high-rise buildings. Thanks to their flexible design—available in both fixed and withdrawable types—ACBs facilitate easy inspection and maintenance, enhancing system reliability. Compared to MCCBs, ACBs offer superior breaking capacity and faster switching speeds, making them ideal for high-power electrical systems.
