Littelfuse Class J Fuses
JTD_ID Series
This series provides visual blown fuse indication and maximum protection in a compact package.
Amperage range (A): 8/10 - 600A
Voltage ratings (Vac): 600V
Voltage ratings (Vdc): 300V, 500V
Features:
- POWR-PRO performance
- Current limiting
- IEC Type 2 Protection
- Indication and non-indication versions available
- Dual-element design
Applications:
- Transformer protection
- Protection for series rated molded case circuit-breaker panels
- Fused combination motor controllers and motor control centres
- General purpose circuits
JTD Series
The Littelfuse POWR-PRO JTD series provides visual blown fuse indication and maximum protection in a compact package.
Amperage range (A): 8/10 - 600A
Voltage ratings (Vac): 600V
Voltage ratings (Vdc): 300V, 500V
Features:
- POWR-PRO performance
- Current limiting
- IEC Type 2 protection
- Indication and non-indication versions available
- Indicating and DIN mount holders available
- Dual-element design
Applications:
- Fused combination motor controllers and motor control centres
- Transformer protection
- Protection for series rated molded case circuit-breaker panels
- General purpose circuits
JLS Series
Littelfuse’s JLS series fuses provides space saving, fast-acting overload and short-circuit protection for vital industrial and power conversion applications. The JLS series offers best in class current limitation that prevents equipment damage from overcurrent faults.
Amperage range (A): 1 - 600A
Voltage rating (Vac): 600V
Features:
- Superior performance in a space saving package
- Reliable interruption of all overcurrents with protection up to 200kA
- Extremely current limiting
- Fast-acting protection for surge-sensitive devices and components
- Reduces heating and magnetic effects due to the overcurrents, extending equipment life.
Applications:
- Power conversion device protection
- Variable speed drives
- Rectifiers
- Resistive loads solid-state devices
LDFJ Series
Littelfuse’s LDFJ series fuses provides space saving, high-speed performance and short-circuit protection for AC and DC drives. The LDFJ range of fuses offer current limiting features with lowest I2T for protection of power semiconductor devices and motor controllers.
Amperage range (A): 1 - 600A
Voltage ratings (Vac): 600V
Voltage ratings (Vdc): 450V
Applications:
- All AC/DC drives (including variable frequency drives)
- Power converters and solid-state devices
- Resistive loads, such as resistance electric heat
For further information on Littelfuse's Class J fuses please contact us on: 01444 243 452 or email: .(JavaScript must be enabled to view this email address).

Littelfuse
Littelfuse is a global manufacturer of leading technologies in circuit protection, power control, and sensing. Littelfuse products are found in automotive and commercial vehicles, industrial applications, data and telecommunications, medical devices, consumer electronics, and appliances. They partner with customers to design, manufacture, and deliver innovative, high-quality solutions, for a safer, greener, and increasingly connected world—everywhere, every day.
Further information:
You can find further information on Littelfuse using the following links:
Tel: 01444 243 452
Fax: 01444 870 722
Email: enquiries@gdrectifiers.co.uk
