Introducing the next step in fuse technology and arc flash mitigation - an intelligent, controllable fuse for medium voltage applications. The Mersen Medium Voltage Controllable Fuse provides arc flash protection with a plug-in retrofit to existing MV fuses at a low total cost and minimal installation downtime and ownership maintenance.  

Arc Flash Mitigation

Mersen’s Medium Voltage Controllable Fuse (MVCF) System is designed to mitigate the Arc-Flash hazard on the low-voltage side of a medium voltage transformer. The industry’s first fuse to provide normal short-circuit and overload protection while having the capability to open on command, this fuse is a cost-effective arc flash solution with minimal installation downtime.


Why Mersen Developed the MVCF

OSHA Code 29 CFR-1910 Subpart S requires employers to:

  • Identify and analyze arc-flash hazards
  • Provide adequate personal protective equipment (PPE).
  • For many installations, the arc-flash energy is over 40 cal/cm2, which is too high for PPE, requiring owners to prevent access to those areas unless power is disconnected. This is typically unworkable and does not mitigate the hazard.


Click to download the Medium Voltage Controllable Fuse Brochure

The Problem the MVCF Solves

The line-sides of the main Low Voltage breakers have potential for arc-flash energies well beyond the capabilities of any PPE. The reason for this is that the closest upstream protective device is usually a Medium Voltage fuse on the primary side of the transformer. This fuse is designed to provide short circuit and overload protection without opening during the normal transformer in-rush current.


Medium Voltage Controllable Fuse

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