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