Thailand’s manufacturing sector continues to expand with the development of automotive, electronics, food processing, and smart factories. With increasing electrical system capacity and the application of high-power equipment, ensuring electrical safety and operational reliability has become a key concern for industrial facilities.

Arc flash is an electrical fault phenomenon in which current does not flow along a normal conductor but instead forms a continuous discharge through the air due to insulation failure, short circuit, or misoperation, generating high temperature, high pressure, strong light, and shock waves.

Arc flash accidents in medium and low voltage switchgear can cause severe equipment damage, long production downtime, and safety risks for maintenance personnel. Traditional overcurrent protection may not respond quickly enough to minimize arc flash energy.

Acrel ARB Series – Fast and Intelligent Arc Flash Protection Solution

（https://www.acrel.co.th/shop/acrel-arb-series-arc-protection-relay)

The Acrel ARB Series Arc Flash Protection Relay provides high-speed detection and protection for factory power distribution systems. By combining arc light detection and current monitoring, ARB series can quickly identify arc faults and send trip signals to circuit breakers within milliseconds, significantly reducing arc flash energy and protecting equipment and personnel.

Key Features

✓ Ultra-fast Arc Fault Detection
Detects abnormal arc light signals and triggers protection actions within milliseconds to minimize damage.

✓ Dual Protection Mode
Combines optical arc detection with overcurrent protection for reliable fault identification and avoiding false operations.

✓ Multi-channel Monitoring
Supports multiple arc sensors for monitoring different compartments of switchgear, including busbars, cable compartments, and breaker sections.

✓ Easy Integration
Supports RS485 communication and Modbus protocol for integration with factory power monitoring systems and SCADA platforms.

Project cases

(One substation used 86 ARB6-A6 arc flash protection devices.）