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Varistors HMOV

15.10.2019

Littelfuse has announced the release of the highly reliable HMOV series varistors for heavy duty applications. Designed with an innovative silicone coated coating, the HMOV series varistors are the first varistors in the industry capable of operating at a maximum temperature of 125°C with an insulation value of 2500V! Standard products cannot provide the above parameters. For example, conventional epoxy-coated varistors can operate at a maximum of 85°C, while phenol-coated varistors are limited in isolation voltage (typically up to 800 V). The reliability of HMOV varistors is confirmed by the Thermal Shock Cycling Test from -55ºC to 125ºC for 1000 cycles!

HMOV varistors have good pulse power dissipation. The peak currents of varistors with a disk diameter of 20 mm reach a level of 10 kA (with a pulse front of 8/20 µs).

The combination of high isolation voltage, high operating temperature, and excellent dissipation characteristics make the HMOV range suitable for the most severe operating conditions to eliminate surges, transients, interference in outdoor and industrial applications. In particular - to provide protection at the input of LED drivers and uninterruptible power supplies, as well as in security and fire extinguishing systems.

Features:

Maximum operating temperature: 125°C
Insulation voltage: 2500V
Peak currents: 10 kA (8/20 µs)
Disc sizes: 10, 14, 20 mm
UL 1449 (Type 5) and IEC 60950-1 (Annex Q) compliant
Lead-free, Halogen-free, RoHS

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