Overview
The Bussmann JJS-20 is a Class T current-limiting fuse rated 20A at 600VAC. Manufactured by Eaton’s Bussmann series, the JJS-20 delivers advanced short-circuit protection with a 200kA interrupting rating, making it ideal for industrial and commercial electrical systems requiring fast response and superior component protection.
Key Features
- Class T cartridge fuse with compact, space-saving footprint
- Fast-acting (very fast blow) design for rapid fault isolation
- 10X better current limitation than standard fuses to prevent equipment damage
- Ferrule-end construction for secure holder connection
- 200kA interrupting rating complies with NEC Section 110.9
- UL, CSA, and RoHS certified for reliability and safety
- Ideal for VFD line protection and critical circuit applications
Technical Specifications
- Amperage Rating: 20A
- Voltage Rating: 600VAC
- Interrupting Rating: 200kA @ 600V
- Fuse Class: Class T
- Speed Rating: Fast Acting (Very Fast Blow)
- Body Type: Cartridge with Ferrule Ends
- Diameter: 0.56 in. ±0.04
- Length: 1.5 in. ±0.04
- Certifications: UL 248-15 (Guide JDDZ, File E4273), CSA C22.2, CE, RoHS
- Series: Bussmann Limitron JJS
- Quantity per Lot: 9 units
Typical Applications
The Bussmann JJS-20 is well suited for:
- Variable frequency drive (VFD) line protection
- Industrial control panel main circuits
- Commercial electrical distribution systems
- Equipment circuits requiring fast-acting overload and short-circuit protection
- Critical applications where component protection from high fault currents is essential
Compatibility & Replacements
Compatible With
- Standard Class T cartridge fuse holders rated for 600VAC
- Industrial electrical panels and disconnects rated for Class T fuses
- Control systems and equipment protection circuits rated 600VAC
- Any application requiring NEC Section 110.9 compliant interrupting ratings
Replaces / Drop-In Replacement For
The Bussmann JJS-20 is a direct replacement for other Bussmann JJS-20 units and equivalent Class T 20A 600VAC cartridge fuses from alternate manufacturers. Verify compatibility with your system integrator or equipment documentation before installation to ensure proper holder fit and electrical compatibility.
Works With
- Class T cartridge fuse holders and blocks
- 600VAC electrical distribution equipment
- Industrial control systems and motor protection circuits
- Overcurrent protection coordination in facility-wide electrical systems
