Overview
The Bussmann JJS-100 Limitron™ is a Class T fast-acting, current-limiting fuse engineered for demanding industrial and commercial electrical systems. Rated at 100A, 600V with a 200 kAIC interrupting rating, this fuse provides advanced protection against overcurrent and short-circuit events while maintaining a compact, space-efficient design. The JJS-100 is UL and CSA certified and widely used in VFD line protection and equipment backup circuits.
Key Features
- Current-Limiting Technology: Reduces available fault current to prevent catastrophic equipment damage
- Very Fast-Acting Response: Protects sensitive electronics and critical loads with rapid fault isolation
- 200 kA Interrupting Rating: Complies with NEC Section 110.9 for large-capacity systems
- Small Footprint Design: Compact blade-type construction fits standard Class T fuse holders
- Non-Indicating: Simple, reliable operation without visual status indication
- Industrial Grade Certifications: UL 248-15 and CSA C22.2 No. 248-15 listed
Technical Specifications
- Amperage Rating: 100A
- Voltage Rating: 600V AC
- Fuse Class: Class T (fast-acting, current-limiting)
- Interrupting Rating: 200 kAIC at 600V
- Terminal Type: Bolted blade end × bolted blade end
- Response Speed: Very fast-acting (VFAA)
- Status Indicator: Non-indicating
- UL File Number: JDDZ, File E4273
- Standards Compliance: UL 248-15, CSA C22.2 No. 248-15
Typical Applications
- VFD (Variable Frequency Drive) line protection and motor control circuits
- Backup protection in industrial power distribution panels
- Critical load protection in commercial electrical systems
- Equipment-specific circuits requiring fast, current-limiting protection
- Short-circuit coordination in coordinated protection schemes
- Industrial machinery control systems
Compatibility & Replacements
Compatible With
- Standard Class T fuse holders (blade-type cartridge mounts)
- Industrial control panels rated 600V AC
- VFD input line circuits
- Equipment with 100A protection requirements
- NEC Section 110.9 compliant electrical systems
Replaces / Drop-In Replacement For
- Older Bussmann/Cooper Bussmann JJS-100 units
- Similar Class T 100A fuses with bolted blade terminals
- Legacy current-limiting fuses in 100A applications
Works With
- Class T fuse clips and holders
- 600V AC electrical distribution systems
- Rockwell (Allen-Bradley) control panels
- Siemens/Schneider Electric industrial systems
- Mitsubishi and ABB motor control circuits
