Eaton Bussmann LPJ-500SP Low-Peak Fuse, 500A 600V AC, Class J Dual-Element Time-Delay - Pack of 3

Low-Peak™ LPJ Series Class J Dual-Element Time-Delay Fuse - Eaton Bussmann Series

The Eaton Bussmann LPJ-500SP is a high-performance Class J dual-element fuse designed for ultimate circuit protection in demanding industrial environments. As part of the Low-Peak™ family, it offers a sophisticated balance of current-limiting performance and time-delay capability. The dual-element construction provides a minimum 10-second time-delay at 500% of the rated current, effectively preventing nuisance openings caused by motor start-up surges or temporary power fluctuations.

With a massive 300kA interrupting rating at 600Vac, the LPJ-500SP ensures safety during high-magnitude fault events. Its current-limiting nature restricts both the peak let-through current and thermal energy (I²t), providing superior protection for downstream components such as motor controllers, transformers, and distribution panels.

Technical Specifications:

• Manufacturer: Eaton
• Brand: Bussmann series
• Catalog Number: LPJ-500SP
• Fuse Class: Class J
• Amperage Rating: 500 A
• Voltage Rating: 600 Vac, 300 Vdc
• Interrupting Rating: 300kA Vac RMS Sym., 100kA Vdc
• Time-Delay: 10 seconds (minimum) at 500% of rated current
• Compliance: UL Listed (Class J), CSA Certified, CE, RoHS Compliant

Physical & Operational Features:

• Energy Efficiency: Dual-element design features lower resistance than standard fuses, resulting in cooler operation and reduced power loss within the enclosure.
• Space-Saving: The Class J footprint is significantly smaller than Class R or Class K fuses, allowing for more compact equipment and panel designs.
• Selective Coordination: Simplifies system design with consistent 2:1 ampacity ratios for all Low-Peak series fuses.

Application: The LPJ-500SP is specifically engineered for branch circuit protection, service entrance equipment, and motor control circuits. It is an industry-standard choice for Type 2 "No Damage" protection for NEMA and IEC motor starters, as well as protecting high-power industrial machinery and power distribution systems where high fault currents are possible.