Littelfuse – Compact varistors handle peak surge currents up to 10kA

Littelfuse has expanded its LV UltraMOVTM series of varistors to provide over-voltage protection to applications with very high DC voltage and surge requirements.

Voltage surges may be induced by interference from indirect lightning strikes, system switching transients, and abnormal fast transients from a power source. Littelfuse’s varistors provide a compact and dependable form of protection against such events.

In its newly extended LV UltraMOV varistor line-up, Littelfuse now supports continuous voltage ratings from 65V DC up to 125V DC, and an enhanced surge-current rating of up to 10kA for an 8/20μs pulse.

The LV UltraMOV series combines these higher ratings with the smallest footprint on the market, more than 40% smaller than competing solutions. The varistors are available in disc diameters of 5mm, 7mm, 10mm, 14mm and 20mm.


  • 10mm, 14mm and 20mm devices are UL recognised and TÜV certified with an 800V isolation voltage rating
  • Phenolic coating option available for higher operating temperatures up to 125°C


  • Telecoms power systems
  • Surge protection devices
  • Automation controls
  • Audio/video equipment
  • Security systems
  • Wireless basestations
  • Fire alarms
  • Mobile phone chargers
  • Cordless phones
  • LED lights