
Class J Fuses

Littelfuse offers three types of current-limiting Class J fuses to meet the need for circuit protection in industrial and electrical power generation and transmission applications. Fast-acting JLS series fuses provide space-saving overload and short-circuit protection in industrial and power conversion applications. JTD time-delay fuses employ POWR-PRO® technology to ensure very high interrupting ratings and are specifically designed for use where space is limited. JTD_ID fuses share the same features and benefits of JTD series fuses but also feature blown-fuse indicators.
- Current ratings from 800 mA to 600 A
- Interrupting ratings of 200 kA at 600 V ac for fast-acting fuses and 300 kA at 600 V ac for time-delay fuses
- Cartridge and blade configurations available
- Compact design
Class J Fuses Parts
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Part Number | Actions | Opening | Current Rating (Continuous) in Amps | |
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Fast-Acting (F) | 1 | |||
Fast-Acting (F) | 3 | |||
Fast-Acting (F) | 6 | |||
Fast-Acting (F) | 10 | |||
Fast-Acting (F) | 15 | |||
Fast-Acting (F) | 20 | |||
Fast-Acting (F) | 25 | |||
Fast-Acting (F) | 30 | |||
Fast-Acting (F) | 35 | |||
Fast-Acting (F) | 40 | |||
Fast-Acting (F) | 45 | |||
Fast-Acting (F) | 50 |
Class J Fuses Applications
- General circuits, especially those carrying resistive loads
- Molded case circuit breaker panels
- Motor control centers
- Rectifiers
- Transformers
- Variable speed drives
Class J Fuses Resources

Updated
POWR-Gard Catalog
Find fuses engineered to provide overcurrent and short circuit protection in industrial, renewable energy, and processing and extraction applications.

UL Class CF Fuses – UL Class J Fuses Cross Reference Guide
Littelfuse offers Class J Fuses that can be used as a substitute for Class CF fuses. Utilize this guide as a cross-reference.

Electric Motor Circuit Protection Application Guide
Download The Importance of Effective Motor and Motor Circuit Protection to learn about preventing current and voltage surges from damaging equipment.
MRO - Fuse Spring Cleaning Video
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MRO - Fuse Spring Cleaning Video
Class J Fuses - The Perfect Substitute for Class CF Fuses
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