BUSSMANN LPJ-125SP 600V 125A Time Delay Fuse

Eaton Bussmann LPJ-125SP 125A Class J Time-Delay Fuse

Buy Eaton Bussmann LPJ-125SP fuse online.The Eaton Bussmann LPJ-125SP is a 125 amp, 600Vac and 300Vdc Class J time-delay current-limiting fuse designed for industrial power distribution, motor circuits, machinery disconnects, control panels and other electrical systems requiring dependable high-fault-current protection.

Part of the Bussmann series Low-Peak™ LPJ family, the LPJ-125SP combines dual-element time-delay performance with fast current limitation during short-circuit conditions. Its high-inrush capability helps the fuse withstand normal temporary startup currents while maintaining effective overload and short-circuit protection.

Key Features

• Catalog Number: LPJ-125SP
• Rated Current: 125 A
• AC Voltage Rating: 600 Vac
• DC Voltage Rating: 300 Vdc
• Fuse Class: Class J
• Operating Characteristic: Time-delay
• Fuse 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: Bolted blade end to bolted blade end
• Application Feature: Suitable for high-inrush motor protection

Technical Specifications

Typical Applications

• Industrial motor circuits
• High-inrush electrical loads
• Industrial control panels
• Machinery disconnects
• Power distribution panelboards
• Branch circuit protection
• Feeder circuit protection
• NEMA and IEC motor controller applications
• Commercial and industrial electrical equipment

Time-Delay Protection for High-Inrush Loads

Motors and other inductive loads can draw substantial temporary current when starting. The LPJ-125SP provides a minimum time delay of 10 seconds at 500% of its rated current, helping the fuse ride through normal startup and transient inrush conditions.

This time-delay performance can help reduce unnecessary fuse openings while maintaining protection against sustained overloads. Proper fuse sizing must always follow equipment specifications and applicable electrical requirements.

Current-Limiting Short-Circuit Protection

During a high-level short-circuit event, the LPJ-125SP rapidly limits the amount of fault current allowed to pass through the circuit. This current-limiting performance helps reduce damaging thermal and magnetic stress on downstream electrical components.

With an interrupting rating of 300 kA at 600 Vac and 100 kA at 300 Vdc, the fuse is designed for properly engineered systems with high available fault-current levels.

Dual-Element Low-Peak Design

The dual-element construction combines overload time-delay performance with fast short-circuit response. Eaton Low-Peak fuses are engineered to provide reliable protection while accommodating temporary overloads and transient surges that can occur during normal equipment operation.

When correctly sized, the LPJ series can support coordinated protection for compatible NEMA and IEC motor controllers and may provide backup protection against motor damage caused by overload or single-phasing conditions.

Class J Space-Saving Construction

The LPJ-125SP uses a Class J fuse configuration with bolted blade connections. The Class J physical design helps prevent substitution with incompatible fuse classes and supports compact installation in compatible Class J fuse blocks, disconnects and fused switches.

Standards and Compliance

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

Important Selection Information

Before ordering, verify the complete catalog number LPJ-125SP, the required 125 amp rating, system voltage, available fault current, fuse dimensions and compatibility with the installed Class J fuse block or holder.

The LPJ-125SP is the non-indicating version. It should not be confused with the LPJ-125SPI, which includes open-fuse indication and has different DC rating considerations.

Ordering Information

Order using the complete manufacturer part number Eaton Bussmann LPJ-125SP. Confirm all electrical ratings, connection requirements and equipment compatibility before purchase or installation.