The UltraMOV™ Varistor Series by Littelfuse encompasses high-performance metal oxide varistors designed for applications that demand significant peak surge current ratings and substantial energy absorption capabilities. Typical use cases for these varistors include but are not limited to Transient Voltage Surge Suppressors (TVSS), Uninterruptible Power Supplies (UPS), AC Power Taps, and AC Power Meters. The series is made to withstand voltage transients generated by phenomena such as lightning strikes, inductive load switching, or capacitor bank switching.
Key Features
Key characteristics of the UltraMOV™ Series include:
- Lead-free and RoHS-compliant options offered
- Custom voltage types and varied lead form and space options available
- High peak surge current handling with CurforA ratings up to 3X for 20 pulse (in the 20mm size)
- Compatibility across a standard operating voltage range that aligns with common AC line voltages (130 VAc to 625 VAc)
Performance Specifications
The UltraMOV™ Series varistors can operate within an ambient temperature range of -55°C to +85°C and come in sizes of 7mm, 10mm, 14mm, and 20mm. They demonstrate a steady-state applied voltage range of 130 V to 625 V and encapsulation rated for Hi-Pot Isolation Voltage at 2,500 V, supporting a strong insulation resistance of at least 1,000 MΩ. Additionally, they can handle a single-pulse peak current in the range of 1,750 to 10,000 A and single-pulse energy ranging from 12.5 to 400 Joules.
Agency Approvals
The varistors have met several important safety and quality standards, as indicated by agency approvals including UL and CSA, with designated agency file numbers for reference.
Ratings & Specifications
The datasheet provides a detailed table of Maximum Ratings and Specifications for continuous steady-state applied voltage at 85°C, peak current, and energy capacities across specific model numbers. This listing includes both lead-free RoHS-compliant models as well as standard models, each associated with their own part branding and numbers for ease of identification. Voltage at clamping, nominal voltage, and typical capacitance values are also indicated for the 8 × 20µs current waveform.
These varistors exhibit several variations in size and capacity, with a strong emphasis on peak current and maximum rated energy specifications. The series is designed to protect against large transients, ensuring a high level of reliability and performance in harsh electrical environments.
Cautionary Note
The datasheet emphasizes that stresses above the stated ‘Absolute Maximum Ratings’ may cause permanent damage to the devices, and such stress ratings are not indicative of operational performance under typical conditions.
As technology and applications evolve, Littelfuse may modify specifications, for which they advise consulting the Littelfuse website for the most up-to-date information on the UltraMOV™ Series.
References:
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