Bussmann LPJ-30SP 30A 600Vac TIME-DELAY CLASS J Fuse

Eaton Bussmann LPJ-30SP 30A Class J Time-Delay Fuse

Buy Eaton Bussmann LPJ-30SP fuse online.The Eaton Bussmann LPJ-30SP is a 30 amp, 600Vac and 300Vdc Class J time-delay current-limiting fuse designed for dependable branch-circuit protection in industrial and commercial electrical systems.

Part of the Bussmann series Low-Peak™ LPJ family, this non-indicating fuse combines dual-element time-delay performance with rapid current limitation during short-circuit conditions. Its high-inrush capability helps accommodate temporary startup currents associated with motors, transformers and other inductive loads while maintaining protection against sustained overloads and high-level fault currents.

Key Features

• Catalog Number: LPJ-30SP
• Rated Current: 30 A
• AC Voltage Rating: 600 Vac
• DC Voltage Rating: 300 Vdc
• Fuse Class: Class J
• Operating Characteristic: Time-delay
• Construction: Dual-element
• Protection Type: Current-limiting
• AC Interrupting Rating: 300 kA RMS symmetrical at 600 Vac
• DC Interrupting Rating: 100 kA at 300 Vdc
• Time-Delay Performance: Minimum 10 seconds at 500% rated current
• Fuse Indicator: Non-indicating
• Connection: Ferrule end to ferrule end
• Overall Dimensions: 2.25 × 0.81 × 0.81 in

Technical Specifications

Typical Applications

• Industrial motor circuits
• Motor controllers and starters
• Machinery disconnects
• Industrial control panels
• Power distribution panelboards
• Feeder and branch circuits
• Transformer and inductive loads
• Commercial and industrial electrical equipment

Time-Delay Protection for High-Inrush Loads

Motors, transformers and other inductive equipment can draw temporary inrush current when energized. A fuse that responds too quickly may open during normal equipment startup, even when no damaging fault is present.

The Bussmann LPJ-30SP provides a minimum time delay of 10 seconds at 500% of its rated current. This time-delay characteristic helps the fuse ride through normal temporary overloads and transient surges while remaining responsive to sustained overcurrent conditions.

Current-Limiting Short-Circuit Performance

During a high-level short circuit, the LPJ-30SP limits the amount of fault current that passes through the circuit. Effective current limitation helps reduce damaging thermal and magnetic stress on conductors, motor controllers, switching equipment and other downstream electrical components.

Its 300 kA AC interrupting rating and 100 kA DC interrupting rating make the LPJ-30SP suitable for properly engineered systems with high available fault current. System voltage and available fault current must remain within the published fuse ratings.

Dual-Element Low-Peak Design

The dual-element design combines overload time-delay performance with rapid short-circuit response. This allows one fuse to provide protection across different overcurrent conditions without requiring excessive oversizing simply to accommodate normal startup current.

When correctly selected as part of a coordinated electrical system, Bussmann Low-Peak fuses can support selective coordination and properly applied motor controller protection. Final fuse sizing must follow the equipment manufacturer's instructions and applicable electrical requirements.

Compact Class J Construction

The LPJ-30SP provides Class J branch-circuit protection in a compact cylindrical package. Its ferrule terminals are designed for compatible 30 amp Class J fuse blocks, fuse holders, disconnects and fused switching equipment.

Class J fuse dimensions help prevent substitution with incompatible fuse classes. Physical fit alone, however, should never be used as the only selection criterion. The current rating, voltage rating, fuse class, operating characteristic and interrupting rating must all match the application.

Compatible Fuse Holder Selection

The LPJ-30SP is intended for compatible 30 amp Class J fuse blocks and holders. Eaton Bussmann holder families for Class J fuses in the 0–30 amp range include JM60030 modular fuse blocks, CH30J holders and JT60030 Safety J™ holders. The exact holder catalog number depends on pole count, terminal configuration, mounting method and cover requirements.

Standards and Compliance

• cULus Listed
• UL 248-8 Class J fuse
• CSA C22.2 No. 248.8 Class J fuse
• CE marked
• RoHS compliant

LPJ-30SP and LPJ-30SPI Identification

The LPJ-30SP is the non-indicating version. It should not be confused with the LPJ-30SPI, which includes an open-fuse indicator. Always verify the complete manufacturer part number before ordering a replacement.

Important Selection Information

Before purchasing, confirm the complete catalog number LPJ-30SP, the required 30 amp rating, system voltage, available fault current, physical dimensions and compatibility with the installed Class J fuse holder.

Do not select a replacement fuse solely by amperage or physical appearance. Voltage rating, fuse class, time-current characteristic, interrupting rating and equipment requirements must also be verified.

Ordering Information

Order using the complete manufacturer catalog number Eaton Bussmann LPJ-30SP. Confirm the required quantity and all electrical specifications before purchase or installation.