Fault Interrupter

Fault Interrupter

Epoxy Insulated Fault Interrupter


  • As the BR10-EFI series fault interrupter is equipped with a highly reliable vacuum interrupter, it has sufficient electrical durability of total 116 numbers of unit operations.
  • It has a high reliability through a simple single driving mechanism and mechanical endurance of 5000 operations.
  • While the fault interrupter is being applied electrically or mechanically, a spring for low voltage trip is charged.
  • It has clearing time with the maximum 3 cycles.


Ratings 15.5kV 25.8kV 38kV
Applied Standard Under development Under development
Rated Current(A) 400A
Rated Frequency(Hz) 60
Rated Short Time Current(kA) 12.5, 1sec
Rated Breaking Current(kA) 12.5
Rated Making Current 32.5, 5 times
Total Number of unit operations 116
Mechanical Endurance 5,000
Rated Power frequency Withstand Voltage(kV) 60
Impulse Withstand Voltage(kV) 150
Operating Mechanism Electrical and Manual
Insulation Medium Solid
Bushing Terminal Universal Clamp, Nema Pad

Main Functions

  • The structure can be operated electrically or mechanically
  • Voltage sensors are equipped for measuring voltage of each phase on source side and load side
  • Current transformers are equipped for measuring current of each phase
  • The position indicator indicates position of the main contact
  • The locking device inhibits electrical or mechanical operations.
  • It is connected to the control through a single cable.
  • The operating handle is for operation using a hook stick from the ground
  • Installation frames are provided for round or square pole, or lattice structure.


  • Use as a Load Break Switch to make and break loads that are below ratings at trunk lines
  • Use as a sectionalizer to operate in conjunction with reclosers on trunk lines or branch lines with loads below ratings
  • Use as a fault interrupter to break faults directly on reclosers on trunk lines or branch lines with loads below ratings
  • Use as a fault interrupter for selective protection according to fault direction in lines connected to distributed power supply