Cooper Bussmann LPN-RK-35SPI Time Delay Fuse 35A RK1

Product Description

The COOPER BUSSMANN LPN-RK-35SPI is a Class RK1 time-delay cartridge fuse rated at 35 amps. It is designed for general-purpose overcurrent protection in branch circuits and equipment where motor loads and inrush currents demand a time-delay response. The fuse features a dual-element construction that tolerates temporary overloads without nuisance opening, while still clearing sustained overcurrents and short circuits quickly. The indicating function signals a blown fuse state, speeding up troubleshooting. Licensed electricians and maintenance technicians install this fuse in industrial panels, motor control centers, and commercial electrical distribution systems.

This fuse fits standard Class RK1 fuse holders and is suited for branch-circuit protection of motors, transformers, and similar inductive loads in residential, commercial, and light industrial applications. Its 35 A rating covers a wide range of single-phase and three-phase motor branch circuits where a time-delay fuse is specified by the equipment manufacturer or the NEC. The cartridge body measures 3 inches in overall length and fits holders designed for Class RK1 fuses.

Key Features

• Class RK1 time-delay dual-element design tolerates motor inrush without nuisance tripping
• 35 A continuous rating for branch-circuit and equipment protection
• 100 kA interrupting rating at DC and 300 kA at AC (RMS) for high fault-current environments
• Indicating feature provides visible blown-fuse signal to reduce diagnostic time
• Cartridge body mounts in standard RK1 fuse holders
• CE Certified, CSA Certified (C22.2 No. 248.12), and UL Listed (Guide JDDZ File E4273)

Compatibility

Designed as an OEM-style replacement for Class RK1 cartridge fuse applications. Fits standard fuse holders rated for Class RK1 cartridge fuses in branch-circuit and equipment-protection installations.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the NEC and applicable local codes. De-energize and lock out the circuit before opening any fuse holder or panelboard. Confirm the fuse holder is rated for Class RK1 cartridges and that the ampere rating matches the circuit design. Never replace a blown fuse without first identifying and clearing the fault that caused it to open.