Metal-Oxide Varistors (MOVs) Radial Lead Varistors LA Varistor Series Overview
The Littelfuse LA Varistor Series is a collection of radial leaded varistors designed for continuous operation across AC power lines. These devices, intended to protect against transient voltage surges, come in four sizes: 7mm, 10mm, 14mm, and 20mm, and feature an AC/IRMS voltage range between 130V to 1000V with energy absorption capabilities as high as 360J.
The LA Series is notable for its UL recognition and compliance with multiple international standards such as CECC, IEC 61051-1, and IEC 61051-2. Notably, the 14mm and 20mm models also comply with IEC 60950-1 (Annex Q). RoHS compliance indicates that the series is lead-free and halogen-free, signifying an environmentally conscious design. These varistors can endure temperatures up to 85°C without derating and are available in both tape and reel or bulk packaging, facilitating ease of use in manufacturing processes.
Models come with various clamping voltage options indicated by a model number suffix: ‘A’ for standard models and ‘B’ for models with lower clamping voltage. These features make the series adaptable for different applications requiring voltage surge suppression.
Key Features:
- Energy absorption up to 360J
- Operating voltage ranging from 130V to 1000V AC IRMS
- Available in multiple sizes: 7mm, 10mm, 14mm, and 20mm
- No derating required up to 85°C ambient temperature
Maximum Ratings and Electrical Specifications:
The datasheet provides a detailed table of maximum ratings and specifications across the series at 85°C as well as typical values at 25°C. It lists continuous and transient varistor voltages, current, clamping capacity, and DC test voltage, among other parameters. For instance, part numbers beginning with V13 prefixed models have AC voltage ratings ranging from 130 to 175V and can withstand peak currents of 1200 to 6500A, depending on the specific model within the series.
Safety and Agency Approvals:
The series has been recognized by UL and meets the requirements of international standards such as CECC 42201-006, IEC 61051-1, and IEC 61051-2. The 14mm and 20mm models also adhere to additional safety requirements of IEC 60950-1 (Annex Q).
Important Notes:
The datasheet warns against operating devices beyond their maximum listed ratings to avoid potential permanent damage. It also specifies that such stress ratings are for analysis purposes and do not suggest functional operation above recommended conditions.
All specifications are subject to change, which is typical for electronic components datasheets, to account for technological advancements or industry standards updates.
References:
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