Overview
The Eaton Bussmann LPJ-20SP is a dual-element, time-delay, Class J current-limiting fuse rated for 20A at 600VAC (300VDC). This Low-Peak fuse is engineered for high-performance circuit protection in industrial machinery, control panels, and branch circuit applications. The separate overload and short-circuit elements enable precise coordination with other protective devices while accommodating inrush currents common in motor circuits.
Key Features
- Dual-Element Design: Separate overload and short-circuit elements provide time-delay protection, ideal for motor and equipment starting
- High Interrupting Rating: 300 kA interrupting rating at 600 VAC and 100 kA at 300 VDC
- Time-Delay Performance: Minimum of 10 seconds of 500% rated current ride-through, compatible with high inrush loads
- Selective Coordination: 2-to-1 selective coordination ratio within Low-Peak fuse family prevents cascading shutdowns
- Compact Cartridge Body: 0.81″ diameter × 2.25″ length with ferrule terminals for standard fuse holders
Technical Specifications
- Amperage Rating: 20A
- Voltage Rating: 600VAC / 300VDC
- Fuse Class: Class J
- Interrupting Rating: 300 kA @ 600VAC; 100 kA @ 300VDC
- Response Time: 10 seconds minimum at 500% rated current
- Element Type: Dual-element, current-limiting
- Body Material: Melamine
- Dimensions: 0.81″ Dia × 2.25″ L (20.57mm × 57.15mm)
- Terminal Type: Ferrule end × ferrule end
- Indicator: Non-indicating
- Certifications: UL Listed, CSA Certified, RoHS Compliant
Typical Applications
The LPJ-20SP is suited for:
- Branch circuit and motor protection in industrial control panels
- Machinery and equipment circuits with high inrush currents
- Power distribution and panelboard main/branch protection
- Automation and process control systems requiring reliable overcurrent protection
- Equipment where selective coordination is critical to minimize downtime
Compatibility & Replacements
Compatible With
- Standard Class J cartridge fuse holders rated for 600VAC operation
- Industrial control panels and branch circuit panelboards
- Motor protection circuits with dual-element fuse coordination requirements
- Electrical systems rated for 600VAC / 300VDC operation
- Eaton / Bussmann Low-Peak fuse families and selective coordination schemes
Replaces / Drop-In Replacement For
Common substitute model numbers include Littelfuse JTD and Mersen AJT in equivalent ratings. Always verify replacement compatibility with system integrator before ordering.
Works With
- UL-listed fuse holders and rejection-style fuse blocks
- Coordinated protection schemes with Bussmann Low-Peak fuse families
- Industrial control systems and motor starters requiring selective coordination
- Electrical distribution equipment certified for 600VAC Class J fuses
