AQ-103 Arc Flash Protection - Medium Voltage

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AQ-103 is a sophisticated microprocessor-based arc flash protection unit for arc light detection. AQ-103 acts as a sub-unit to AQ-110P (or, AQ-110F) in an AQ-100 arc protection system. It can also function as a stand-alone unit in light-only systems. AQ-103 is designed to minimize the damage caused by an arcing fault (arc flash) by tripping the circuit breaker that sources the fault current. The complete system self-supervision function of AQ-101 provides the highest level of dependability by continuously monitoring all internal system functions as well as with external connections. AQ-103 provides communication through RS-485 and Modbus protocol as ordering options. Through the Modbus communication AQ-103 connects to a local display (AQ-S254) for indication of exact fault location and to a SCADA system either trough a AQ-S254 or RTU.


  • A wide range for the power supply (18…72 V DC or 92…265 V AC/DC)
  • A maximum of 14 arc light point sensors (1 point sensor per channel)
  • A maximum of 1 fiber loop sensor or connection to quenching device (optional)
  • 4 trip relays
  • 1 system failure relay
  • 1 fast binary output
  • 2 fast binary inputs
  • 1 high-speed output (HSO)
  • 1 multifunction push button
  • Non-volatile memory
  • 25 indication LEDs
  • Modbus protocol (optional)