Transformer Fuses – MV HV Fuses 12kV-30kV/40.5kV Transformers IEC ABB CEF-S

Transformer Fuses - MV HV Fuses 12kV-30kV/40.5kV Transformers IEC ABB CEF-S

Transformer Fuses – MV HV Fuses 12kV-30kV/40.5kV Transformers IEC ABB CEF-S


MV HV | Medium & High Voltage Electrical Circuit & Equipment Protection 

Distribution Transformers Protection up to 30kV/40.5kV

Rated Voltages | 6/12 kV – 30/40.5 kV
Rated Currents |  6.3 A – 63 A

ABB CEF-S transformers fuses are current-limiting fuses which are especially suited for protecting MV-HV distribution transformers, 6/12kV 30/40.5kV, 6.3-63A and can be used for high power wind farms (up to 3000kVA) when used in combination with NALFWind load break switches. MV-HV fuses, manufactured by ABB, suitable for 12-24kV and 30/40.5kV transformer applications in accordance with IEC specification.

ABB CEF-S-TCU transformer fuses have integrated thermal released striker pins allowing the fuse release to be temperature dependant and overload spots which significantly reduce the fuse temperature during the interruption process. The CEF-S fuse has a high capability up to 50kA and temperature control units increase application safety for gas insulated panels, switchgear and electrical equipment up to 33kV.

CEF-S current limiting fuses are back-up type medium voltage fuses which limit the value of prospective short-circuit currents during the interruption process and extended the life time of nearby installed electrical equipment. ABB CEF-S fuses when used in combination with load break switches equipped with fuse tripping system ensures control over the full range of overload and short-circuit currents.


ABB CEF-S Fuses | Contact us for Price | Stock | Technical Support | ABB MV Electrical Products

ABB CEF-S Transformer Fuses

Features & Benefits

  • Rated fuse voltage: 12, 24 and 30/40,5 kV, rated current 6,3 – 63 A
  • Excellent protection against faults in medium voltage switchgears
  • MV fuses are special design to achieve very low breaking current within 100ms
  • Low minimum breaking current for medium/high voltage transformer fuses
  • Low power losses, specially suitable in compact switchgear and ring main units
  • High breaking capacity and current limitation
  • Type tested medium voltage fuses according to IEC 60282-1
  • Versions ABB CEF-S-TCU equipped with Temperature Control Unit, that protects against high temperature in enclosed compartments
  • Medium type striker, which is activated immediately when the fuse-elements melt
  • Dimensions according to IEC 60282-1 and DIN 43625
  • ABB Optional Accessories – Fuse clips, fuse extension adaptor, indoor & outdoor fuse base with optional fuse presence/blown indication, test fuse link for striker system adjustment and operating tong for fuse replacement
  • Also: MV HV Surge Arresters 11kV 33kV

IEC 60282-1:2020 applies to all types of high-voltage current-limiting fuses designed for use outdoors or indoors on alternating current systems of 50 Hz and 60 Hz and of rated voltages exceeding 1000V.

ABB CEF-S Transformer Fuses – Fuse Ratings & Dimensions

Rated Voltage Un (kV)Rated Current ln (A)Fuse Length e (mm)Fuse Diameter D (mm)Maximum Tested Breaking Current l1Striker Temperature Control Unit (TCU) 80NOverload Spots
30/40.5kV6.3-63A537mm65 / 87mm20kAYesYes


ABB CEF-S Transformer Fuses

ABB CEF-S Transformer Fuses – Dimensions

current limiting fuse-link | mEDIUM vOLTAGE

The upgraded portfolio of ABB CEF, CEF-S and CEF-VT current limiting fuses offers wide application range in medium voltage systems, especially for protection of distribution transformers.

All CEF brand fuses have integrated thermal released striker pin in combination with overload spots that is unique ABB design. That brings new standard for safety in fuse interruption processes. Moreover, the new design of ABB CEF, CEF-S and CEF-VT fuses comes with useful features like unified voltage ratings, outdoor sealing, graved fuse data and welded current path that improve fuse performance and extends flexibility in application range.

MV HV Transformer Switchgear Cable Connectors & Terminations

Thorne & Derrick also distribute an extensive range of MV-HV Joints, Connectors & Terminations for installing medium/high voltage power cables onto gas insulated switchgear networks up to 33kV – this includes outer cone (Nexans Euromold) and inner cone (Pfisterer CONNEX) type cable plug and connectors. MV-HV fuses are available for transformer, switchgear, motor circuit and capacitor protection.

Cable Connectors Terminations

ABB – GIS Gas Insulated Switchgear For MV HV Medium/High Voltage Power Systems, 11kV/33kV & EHV

Data Sheets