Overview
The Bussmann LPJ-150SP is a Low-Peak Class J dual-element, time-delay fuse designed for branch-circuit and motor-circuit protection in industrial automation and control systems. Manufactured by Eaton’s Bussmann division, the LPJ-150SP delivers current-limiting protection with a 150-ampere rating at 600VAC or 300VDC, featuring an industry-leading 300 kA interrupt rating at 600VAC and 100 kA at 300VDC. The dual-element design separates overload and short-circuit protection, enabling selective coordination with downstream equipment.
Key Features
- Dual-Element, Time-Delay Design: Provides minimum 10-second response at 500% rated current, allowing high inrush loads (motors, compressors) to start without nuisance trips
- Current-Limiting Performance: Reduces damaging thermal and magnetic effects of fault currents on downstream components
- Selective Coordination: 2:1 ampacity ratio within the Low-Peak family ensures faults remain isolated to the failed circuit
- UL and CSA Certified: Meets rigorous safety standards (UL File E4273, CSA 22.2 No. 248.8, RoHS compliant)
- Series Combination Ratings: Compatible with branch-circuit breakers for broad protective coverage independent of breaker manufacturer
Technical Specifications
- Current Rating: 150 Amperes
- Voltage Rating: 600 VAC, 300 VDC
- Interrupt Rating (AIC): 300 kA @ 600 VAC; 100 kA @ 300 VDC
- Time Delay: Minimum 10 seconds at 500% rated current
- Fuse Class: UL Class J
- Element Type: Dual Element, Time Delay
- Terminal Style: Bolted Blade Terminal
- Body Type: Cartridge, Melamine Housing
- Dimensions: 1.63 in. Dia × 5.75 in. L (41 mm × 146 mm)
- Weight: 13.6 oz (385 g)
- Indication: Non-Indicating
- Certifications: UL Listed, CSA Certified, RoHS Compliant
Typical Applications
The LPJ-150SP is ideal for:
- Motor branch-circuit protection in industrial automation systems
- NEMA and IEC motor controllers requiring coordinated overload and short-circuit protection
- Industrial equipment with high-inrush loads (compressors, pump motors, spindle drives)
- DC applications up to 300 volts (servo drives, power supplies, renewable energy systems)
- Panelboards and motor control centers requiring current-limiting protection
- Three-phase and single-phase systems in manufacturing, processing, and mining operations
Compatibility & Replacements
Compatible With
- UL Class J fuse holders and clips
- Eaton Bussmann LPJ-SP series fuse holders
- Class J panelboard and motor-control-center slots
- Branch-circuit breakers rated for series-combination use
- NEMA-rated and IEC-compliant motor starters
Replaces / Drop-In Replacement For
- Eaton Bussmann LPJ-150 (older non-SP variant)
- Littelfuse JTD-150 Class J dual-element fuses
- Mersen AJT-150 current-limiting Class J fuses
Works With
- Allen-Bradley motor starters and overload protection systems
- Siemens SIMATIC and soft-starter equipment
- Mitsubishi industrial drives and motion controllers
- Omron automation systems
- Schneider Electric devices requiring current-limiting Class J protection
- ABB and Rockwell control circuits
