UNIT-AP Arc Protection Device

UNIT-AP Arc Protection Device

The UNIT-AP device is designed for instantaneous arc fault protection. Can be used in low or medium voltage switchgears with the alternating or direct current. In a short circuit accompanied by an opened arc, the fiber optic sensor (FOS) can quickly localize the fault. Minimizes damage of electrical equipment, improves the reliability of power supply and increases the safety of staff.


  • High-speed arc detection via fiber optic sensors
  • Extremely short operating time (≤1 ms)
  • Up to 4 loop sensors (max length 10 m of each) or 2 radial sensors (max length 25 m) resistant to the EMC
  •  influences and sensitive to the radiation pulses in the visible wavelength range
  •  6 output relays (2xHigh-speed solid state relays, 3xSignalization relays, IRF)
  •  Up to 2 binary inputs (OCP start signal monitoring from an external relay)
  •  7xLEDs, «Reset» button on the front panel
  •  CBFP
  •  Configurable software logic
  •  Communication port 1xRS-485 (Modbus RTU)
  •  Time synchronization

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