Overview
The Bussmann LPJ-70SP Low-Peak fuse is a current-limiting Class J cartridge fuse designed for branch-circuit and feeder protection in industrial automation, motor control, and distribution applications. This dual-element, time-delay fuse combines overload and short-circuit protection elements, making it ideal for systems with high inrush loads that require selective coordination and reliable arc interruption.
Key Features
- Dual-Element Time Delay: 10-second minimum delay at 500% of rated current, protecting against nuisance trips while responding to true faults.
- High Interrupting Rating: 300 kA @ 600VAC / 100 kA @ 300VDC breaking capacity ensures safe arc suppression.
- Selective Coordination: 2:1 selective coordination ratio within Low-Peak fuse family prevents electrical shutdowns from extending beyond the failed circuit.
- Current-Limiting Design: Reduces let-through current and energy stress on downstream components.
- Compact Cartridge Form Factor: 1-1/8″ x 4-5/8″ (28.7mm x 117.6mm) blade-terminal construction fits standard Class J fuse holders.
- Agency Approvals: UL Listed (File JDDZ E4273), CSA Certified, RoHS compliant.
Technical Specifications
Key electrical and physical parameters:
- Rated Current: 70 Ampere
- Voltage Rating: 600 Vac / 300 Vdc
- Interrupting Rating: 300 kA Vac RMS (Symmetrical), 100 kA Vdc
- Time Delay: 10 seconds minimum at 500% rated current
- Fuse Class: Class J (UL 198.4)
- Fuse Type: Dual-element, current-limiting, cartridge
- Terminal Type: Knife blade
- Body Diameter: 1.13 inches (28.7 mm)
- Body Length: 4.63 inches (117.6 mm)
- Color: Yellow (standard Low-Peak color code)
- Series: LPJ (Low-Peak brand by Bussmann/Eaton)
Typical Applications
The LPJ fuses are ideal for sizing of high inrush loads, making them suitable for:
- Motor branch-circuit protection in automation cabinets
- Transformer and choke protection
- Industrial control circuits with transient inrush requirements
- HVAC compressor and pump motor circuits
- Manufacturing equipment and process control systems
- UPS and power distribution systems requiring selective coordination
Compatibility & Replacements
Compatible With
- Standard Class J fuse holders and clips (rejection-type bases may require adapter)
- 600V ac/300V dc electrical distribution systems
- Industrial PLCs, drives, and control modules requiring branch-circuit protection
- Power distribution panels and motor control centers rated for 600 Vac
Replaces / Drop-In Replacement For
- Other 70-amp Class J dual-element fuses with equivalent time-delay characteristics
- Verify specific replacement compatibility with your system integrator before ordering
Works With
- Series combination ratings with branch-circuit breakers for coordinated protection
- Class J fuse-holder assemblies in allen-bradley, Siemens, Schneider Electric, and other industrial control equipment
- Industrial electrical systems utilizing selective coordination protocols
