LPJ-100 SP LOW PEAK FUSE BUSSMANN
LPJ-100 SP LOW PEAK FUSE BUSSMANN – Industrial 100A 600VAC/300VDC Class J Dual-Element Time-Delay Fuse
The LPJ-100 SP LOW PEAK FUSE BUSSMANN (Model LPJ-100SP / LPJ-100SPI) is a heavy-duty, ultimate-protection dual-element time-delay knife-blade branch circuit fuse manufactured by Eaton’s Bussmann series. Engineered specifically to provide advanced overcurrent, short-circuit, and high-inrush motor protection, this 100-amp, 600 VAC / 300 VDC Low-Peak™ Class J fuse delivers maximum current limitation and safety across commercial and industrial power panels.
Featuring dual-element time-delay performance, the LPJ-100 SP LOW PEAK FUSE BUSSMANN holds a minimum 10-second time-delay at 500% of its rated current. This allows temporary motor starting currents, transformer primary inrushes, and heavy inductive load surges to pass without causing unwanted fuse openings. Under severe short-circuit conditions, its fast current-limiting action safely interrupts prospective fault currents up to 300 kA RMS Symmetrical at 600 VAC and 100 kA at 300 VDC. Built in a standard UL Class J knife-blade format (1.13” x 4.63” / 28.7 x 117.6 mm), it offers a space-saving alternative to larger Class R or Class H fuses.
Key Features of the LPJ-100 SP LOW PEAK FUSE BUSSMANN
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Dual-Element Time-Delay Performance: Holds a minimum 10-second time-delay at 500% rated load, eliminating unnecessary fuse openings caused by heavy motor acceleration and transient surges.
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Ultra-High 300 kA Interrupting Capacity: Rated to safely interrupt severe short-circuit currents up to 300 kA RMS Symmetrical at 600 VAC (100 kA at 300 VDC), ensuring compliance with NEC® safety standards.
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Optional Visual Blown Fuse Indicator (
SPIVersion): Features an integrated window trip indicator on the body label that instantly signals open-fuse status for quick troubleshooting during maintenance. -
Superior Current Limitation: Restricts peak let-through thermal energy (I^2t) and magnetic stress during short circuits, protecting downstream breakers, contactors, and switches.
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Dual AC/DC Voltage Rating: Fully certified for continuous operation up to 600 VAC and 300 VDC, providing broad circuit compatibility.
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Type 2 “No Damage” Protection: When properly sized, provides Type 2 coordinated short-circuit protection for NEMA and IEC motor controllers and contactors.
Common Applications and Practical Usage
The high interrupting capacity, 100A rating, and superior surge withstand capability of the LPJ-100 SP LOW PEAK FUSE BUSSMANN make it an indispensable protective device across heavy industrial systems:
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Industrial Motor Branch Circuits: Protects medium-to-large AC/DC motor starters, soft starters, and variable frequency drive (VFD) mains without nuisance tripping during startup.
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Power Distribution Switchboards & Panelboards: Serves as main or feeder branch circuit protection in $600\text{V}$ power panels and fused safety disconnect switches.
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Control Transformer Primary Protection: Safeguards primary windings of power distribution transformers while riding through intense magnetizing inrush currents.
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Process Heating & HVAC Machinery: Protects industrial resistance heating loads, heavy-duty commercial HVAC chillers, and automated process control systems.
Technical Specifications
The core electrical, physical, and compliance specifications for the LPJ-100 SP LOW PEAK FUSE BUSSMANN are detailed below:
| Parameter Specification | Technical Details & Operational Values |
| Component Classification | Class J Dual-Element Time-Delay Current-Limiting Fuse |
| Primary Target Keyword | LPJ-100 SP LOW PEAK FUSE BUSSMANN |
| Brand / Series | Eaton Bussmann Series / Low-Peak™ LPJ |
| Catalog Model / Part No. | LPJ-100SP (Non-Indicating) / LPJ-100SPI (Indicating) |
| Amperage Rating | 100 Amps (100A) |
| Voltage Rating | 600 VAC / 300 VDC |
| Interrupt Rating (IR) | 300 kA RMS Symmetrical at 600 VAC / 100 kA at 300 VDC |
| Response Characteristic | Time-Delay (Min. 10 seconds at 500% current) |
| Fuse Class & Form Factor | UL Class J Knife-Blade (1.13” Dia x 4.63” Length) |
| Terminal Connection Type | Bolted Knife-Blade End Terminals |
| Body Material | High-Density Composite Casing with Metal Blade End Caps |
| Agency Certifications | UL Listed (Std 248-8, Class J, Guide JDDZ), CSA Certified, CE, RoHS |
Operating Guidelines and Usage Tips
SAFETY NOTICE: Always isolate main power supplies and verify circuits are completely de-energized using a calibrated voltage tester prior to inspecting or replacing power fuses.
Holder Compatibility: Install exclusively in dedicated UL Class J 70–100A blade fuse blocks or safety disconnect switches (such as Bussmann JM60100 series fuse blocks).
Motor Protection Sizing: For motor branch circuits, size the fuse between 150% and 175% of motor full-load amperes (FLA) in accordance with NEC® Article 430 rules to achieve full overload protection without nuisance trips during startup.
To review official Class J fuse standards and low-voltage current-limiting overcurrent protection guidelines, consult the National Electrical Manufacturers Association (NEMA) Directory.
To check regional warehouse inventory availability or request commercial quotes for volume electrical fuses, visit the Control Qatar Contact Page.
