LPJ_SP Class J
Available With Indication
Description: Dual-element, time-delay fuse; 10 seconds (minimum) at 500% rated amps. Now available with optional indication on select ratings
Ratings:
Volts: 600Vac (or less); 300Vdc (or less)
Amps: 1-600A
IR: 300kA RMS Sym. 100kA dc
Agency Information: CE, UL Listed - Special Purpose*, Guide JFHR, File E56412, CSA Certified (200k AIR) Class J per CSA-22.2 No. 248.8, Class 1422-02, File 53787.
General Information:
• True dual-element fuses with a minimum 10 second timedelay at 500% overload.
• Long time-delay minimizes needless fuse openings due to temporary overloads and transient surges.
• Can often be sized for back-up protection against motor burnout from overload or single-phasing if other overload protective devices fail.
• High interrupting rating to safely interrupt overcurrents up to 300,000A.
• High degree of current limitation due to the fast speed-ofresponse to short-circuits.
• Faster response to damaging short-circuit currents than mechanical overcurrent protective devices.
• Reduces let-through thermal and magnetic forces in order to protect low withstand rated components.
• Proper sizing provides “no damage” Type “2” coordinated protection for NEMA and IEC motor control in accordance with IEC Standard 947-4-1.
• Dual-element fuses have lower resistance than ordinary fuses so they run cooler.
• Lower watts loss reduces power consumption.
• Unique dimensions assure that another class of fuse with a lesser voltage rating, interrupting rating or current-Iimiting ability cannot be substituted.
• Space-saving package for equipment down sizing.
Features and Benefits
• Separate overload and short-circuit elements provide time delay for sizing of high inrush loads linked with Class J current limitation.
• Selective coordination ratio of 2:1 (within Low-Peak fuse family) prevents electrical shutdowns from extending beyond the failed circuit.
• Series combination ratings with branch circuit breakers allows broad range of coverage, independent of breaker manufacturer.
Typical Applications
• Power Panelboards
• Branch Circuit Breaker Panelboard Mains
• Machinery Disconnects
• Industrial Control
Dimensions
Catalog Numbers (Amps)
| Catalog numbers | Amp rating | Catalog numbers | Amp rating |
| LPJ-1SP | 1A | LPJ-25SP** | 25A |
| LPJ-1-1/4SP | 1.25A | LPJ-30SP** | 30A |
| LPJ-1-6/10SP | 1.6A | LPJ-35SP** | 35A |
| LPJ-1-8/10SP | 1.8A | LPJ-40SP** | 40A |
| LPJ-2SP | 2A | LPJ-45SP** | 45A |
| LPJ-2-1/4SP | 2.25A | LPJ-50SP** | 50A |
| LPJ-2-1/2SP | 2.5A | LPJ-60SP** | 60A |
| LPJ-2-8/10SP | 2.8A | LPJ-70SP** | 70A |
| LPJ-3SP | 3A | LPJ-80SP** | 80A |
| LPJ-3-2/10SP | 3.2A | LPJ-90SP** | 90A |
| LPJ-3-1/2SP | 3.5A | LPJ-100SP** | 100A |
| LPJ-4SP | 4A | LPJ-110SP** | 110A |
| LPJ-4-1/2SP | 4.5A | LPJ-125SP** | 125A |
| LPJ-5SP | 5A | LPJ-150SP** | 150A |
| LPJ-5-6/10SP | 5.6A | LPJ-175SP** | 175A |
| LPJ-6SP** | 6A | LPJ-200SP** | 200A |
| LPJ-7SP** | 7A | LPJ-225SP** | 225A |
| LPJ-8SP** | 8A | LPJ-250SP** | 250A |
| LPJ-9SP** | 9A | LPJ-300SP** | 300A |
| LPJ-10SP** | 10A | LPJ-350SP** | 350A |
| LPJ-12SP** | 12A | LPJ-400SP** | 400A |
| LPJ-15SP** | 15A | LPJ-450SP** | 450A |
| LPJ-17-1/2SP** | 17.5A | LPJ-500SP** | 500A |
| LPJ-20SP** | 20A | LPJ-600SP** | 600A |
*Meets all performance requirements of UL Standard 248-8 for Class J fuses
**Available with optional permanent replace fuse indication. To order, place “I” at end of catalog number. As below table.
Available with silver plated terminals. Add SP/ in front of Catalog Number.
Catalog Numbers (With optional permanent replace fuse indication)
| LPJ-6SPI | LPJ-35SPI | LPJ-150SPI |
| LPJ-7SPI | LPJ-40SPI | LPJ-175SPI |
| LPJ-8SPI | LPJ-45SPI | LPJ-200SPI |
| LPJ-9SPI | LPJ-50SPI | LPJ-225SPI |
| LPJ-10SPI | LPJ-60SPI | LPJ-250SPI |
| LPJ-12SPI | LPJ-70SPI | LPJ-300SPI |
| LPJ-15SPI | LPJ-80SPI | LPJ-350SPI |
| LPJ-17-1/2SPI | LPJ-90SPI | LPJ-400SPI |
| LPJ-20SPI | LPJ-100SPI | LPJ-450SPI |
| LPJ-25SPI | LPJ-110SPI | LPJ-500SPI |
| LPJ-30SPI | LPJ-125SPI | LPJ-600SPI |
Time-Current Characteristic Curves–Average Melt
Current Limitation Curves
