Medium Voltage Fuses

Medium Voltage Fuse-links

Purpose:

• Key component in electro distribution system
• Reliable protection in case of overload and short-circuit

Use:

• Distribution transformerstation – transformer protection
• RMU – ring main unit protection
  Cables and lines – distribution system protection
• Industrial electrical systems – motor drive protection, reactive power
• compensation protection, medium voltage loads protection
• Photovoltaic and wind power systems – transformer substation protection
• Railway and metro systems – power supply protection

Product range

• Nominal voltages: 7,2kV, 12kV, 17,5kV, 24kV, 36kV
• Rated currents: From 1A to 315A
• Characteristics: Back-up, Full-range (in development)
• Striker indication: 50N (VVC3), 80N (VVT-D3), without (VVA3)
• Oil-immersed fuse-links

Standardization

• IEC 60282-1 – Ed-8.0/2020 Current-limiting fuses
  Basic requirements for MV fuse-links, 50Hz and 60Hz voltage above 1000V AC
• DIN 43625 – Hochspannungs-Sicherungen
  German standard for MV fuse-links nominal voltages from 3,6kV to 36kV
• VDE 0670 T402 – Wechselstromschaltgeräte fur Spannungen über 1kV
  Instructions for MV fuse-link selection

MV fuse-links: Advantages

• Reliable sealing system against humidity irruption.
• KEMA type test reports.
• Low temperature rise because of low power dissipation.
• Low minimum breaking currents.
• Low switching voltages.
• High breaking capacity 63 kA.
• Galvanically protected contact caps made of electrolytic copper can be nickel (NI), tin (Sn) or Silver (Ag) plated.
• Striker system: a temperature sensitive element which does not react to short time overloads, only to inadmissible values of temperatures. Convenient for the protection of the fuse-links, installed in enclosures or SF6 switchgears.
• Rigid striker pin.
• Various striker variants (50Nm 80N, without striker, thermo, non-thermo..)
• Silver melting element.
• Easier mounting because of improved contact cap.