Fault Current Limiter - UFCL-Limiter

The fastest limiting and switching device in the world

UFCL-limiter sometimes is referred as a Triggered Fault Current Limiter or an Is-limiter. It is capable of limiting a fault current passing through it within the first half cycle, thus reducing the total value of short-circuit current below the ratings of circuit breaker.

The use of UFCL-limiter allows equipment to remain in service even if the prospective fault current exceeds its rated peak and short-time withstand current and in case of circuit breakers also its rated short-circuit making and breaking current. Replacement of equipment can be avoided or at least shifted to a later date. In case of newly planned networks UFCL-limiters allow the use of equipment with lower ratings which renders possible considerable cost savings.

In comparison with complex conventional solutions, the UFCL-limiter has both technical and economic advantages when used in transformer or generator feeders, in switchgear sectionalizing, and when connected in parallel with reactors.


  • Protect under-rated equipment
  • Bypass current limiting reactors
  • Clear the generator
  • Limit cogenerator fault
  • In incoming feeder of big-capacity transformer


  • +  Protect your systems
  • +  Reduces substation cost
  • +  Significantly improve network redundancy and resiliency
  • +  Solves short-circuit problems in new substations and substation expansion
  • +  Optimum solution for interconnection of switchboards and substations
  • +  In most cases the only technical solution


  • Suitable for indoor use or for outdoor use with or without an enclosure
  • Can be installed in any orientation
  • Easy to install and maintain
  • Rated voltage up to 40.5kV, proofed in lots installations
  • Continuous current rating up to 6300kA