Overview
The Bussmann LPJ-80SP is a Class J dual-element time-delay fuse rated for 80 amps at 600VAC and 300VDC. This Low-Peak fuse combines overload and short-circuit elements in a single cartridge, delivering selective coordination and current-limiting protection for demanding industrial applications including motor controllers, branch circuits, and machinery disconnects. The fuse is UL listed and designed to fit standard Class J fuse blocks.
Key Features
- Dual-Element Design: Separate overload and short-circuit elements provide time-delay protection for high inrush loads while maintaining fast response to true faults
- 10-Second Time Delay: Minimum 10-second delay at 500% of rated load prevents nuisance tripping from normal motor inrush and transient surges
- High Interrupting Rating: 300kA at 600VAC and 100kA at 300VDC ensures robust protection against severe fault currents
- Current Limitation: Protects downstream components from thermal and magnetic damage caused by short-circuit events
- Selective Coordination: 2:1 ampacity ratio within Low-Peak fuse family simplifies coordination and prevents cascading shutdowns
- Non-Indicating, Non-Rejection Design: Works reliably in standard Class J holders without restrictive cartridge requirements
Technical Specifications
Typical Applications
The Bussmann LPJ-80SP is ideal for:
- NEMA and IEC motor controller branch circuit protection
- Industrial machinery and equipment disconnects
- Power distribution panelboards and mains circuits
- Applications requiring selective coordination with branch-circuit breakers
- Systems where inrush-current tolerance and short-circuit limiting performance are critical
Compatibility & Replacements
Compatible With
- Standard Class J fuse blocks and holders (1.13″ diameter, cartridge-style)
- NEMA power distribution equipment and motor control centers
- IEC-compliant industrial control systems
- Branch-circuit breaker panelboards requiring selective coordination
- Industrial disconnects rated for Class J fuses
Replaces / Drop-In Replacement For
The Bussmann LPJ-80SP directly replaces:
- Other Bussmann Low-Peak Class J 80A fuses
- Standard Class J 80-amp time-delay fuses in 600VAC/300VDC applications
- Legacy fuse designs where current limitation and selective coordination are needed
Works With
- Any Class J-rated fuse block or holder assembly
- Electrical systems designed for Class J fuse protection
- Industrial PLC and motor control systems requiring branch-circuit fusing
- Systems coordinated with Bussmann Low-Peak fuse family for consistent 2:1 ampacity ratios
