The TERASAKI ARU-IDC is a specialized Alarm Relay Unit designed as an internal accessory for the TemPower 2 series of Air Circuit Breakers (ACBs). Its primary function is to provide a remote electrical signal or alarm specifically when the breaker’s overcurrent release (OCR) detects an instantaneous overcurrent (I) fault. This unit is essential for advanced monitoring and control systems, enabling immediate notification to operators or automated systems about critical fault conditions. By integrating the ARU-IDC, you enhance the diagnostic capabilities and overall safety of your electrical distribution system, allowing for quicker response times and more effective fault management.