Overview
The Bussmann LPJ-25SP is a UL-listed Class J current-limiting, time-delay fuse designed for industrial control and protection applications. The LPJ-25SP is a time-delay, dual-element current limiting fuse rated at 25 Amps with an interrupting rating of 300 kA at 600 Vac and 100 kA at 300 Vdc. This fuse combines fast short-circuit protection with extended time-delay characteristics to safely accommodate motor inrush currents while protecting downstream equipment.
Key Features
- 300,000 amp interrupting rating at 600Vac RMS Sym and 100kA Vdc with minimum 10 seconds of 500% rated current ride-through performance
- Compact cartridge size of 20.57×57.15mm (0.81 in. x 2.25 in.)
- Dual element design with separate overload and short circuit elements providing selective co-ordination ratio of 2:1 within Low-Peak fuse family
- Non-indicating, non-rejection style compatible with standard Class J holders
- Approvals include CE, UL, CSA, and RoHS compliance
Technical Specifications
The LPJ-25SP meets UL 198.14 Class J fuse standards and is certified by CSA. It is suitable for branch circuit, motor circuit, and backup protection applications in industrial control panels and motor starters.
Typical Applications
- Motor circuit protection with soft-start or VFD inrush tolerance
- Industrial control circuits requiring selective coordination
- Equipment requiring high interrupting rating (300 kA) at 600 Vac
- DC circuit protection at 300 Vdc up to 100 kA
Compatibility & Replacements
Compatible With
- UL Class J fuse holders and bases for cartridge fuses
- Standard industrial control panels rated 600 Vac / 300 Vdc
- Motor starters, soft starters, and variable frequency drives
- Series combination-rated branch circuit breakers (verify with breaker manufacturer)
Replaces / Drop-In Replacement For
- LPJ25, LPJ-25, LPJ 25A, LPJ25A, LPJ-25A, and LPJ25SP variant designations
- Other 25A Class J dual-element time-delay fuses (verify amperage and voltage ratings)
Works With
- Compatible replacement fuses include Littelfuse JTD and Mersen AJT 25A models
- Bussmann Low-Peak LPJ family (selective coordination with 2:1 ratio)
- Any Class J fuse holder base rated 600 Vac minimum
