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IEC current limiting back-up fuse CEF-S

The CEF-S medium voltage fuses are used to protect distribution transformers, where superior performance of fuses is requested for fault currents within 100 ms

Product scope

Fuse-links type CEF-S are designed for fast acting protection of distribution transformers, extending protection over transformer low voltage terminals.


  • Superior performance versus standard fuses ensuring faster protection in case of low fault currents
  • Continuous protection and reliable operation guaranteed by robust design and compliance with newest IEC standards
  • Compatibility with other ABB products provides fast and accurate product selection
  • Outdoor sealing included in standard version, designed and tested for harsh conditions

Key features

  • Rated voltages  6/12 kV – 30/40.5 kV with rated currents of 6.3 A - 63 A
  • For indoor and outdoor applications.
  • Designed and type tested acc. to IEC 60282-1.
  • Top level breaking performance with currents up to 63 kA r.m.s.
  • Striker 80 N (medium type)
  • Equipped with Temperature Control Unit – additional protection against thermal stresses in small enclosures

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