Cooper Bussmann LPN-RK-20SP Cartridge Time Delay Fuse 20A

Product Description

The COOPER BUSSMANN LPN-RK-20SP is a Class RK1 cartridge-style time delay fuse rated at 20 amps. It is a general-purpose fuse designed for use in fuse holders and panel-mount fuse blocks found in HVAC equipment, motor control panels, and industrial electrical systems. The dual-element, time delay design allows the fuse to ride through normal motor inrush current while still providing fast protection against sustained overloads and short circuits. Interrupting ratings reach 100 kA at DC and 300 kA at AC (RMS), making it suitable for high-fault-current environments. The non-indicating body gives no visual blown indication. Licensed electricians and HVAC technicians are the primary installers.

This fuse is suited for residential and light commercial electrical systems where Class RK1 protection is specified. Typical applications include motor branch circuits, transformer primaries, HVAC control panels, and general distribution panelboards that require time delay characteristics to handle startup surge currents without nuisance tripping. The cartridge form factor fits standard RK1-rated fuse holders and fuse blocks. It meets the dimensional and electrical requirements for Class RK1 applications where a dual-element time delay fuse is required by design or code.

Key Features

• Class RK1 dual-element time delay design handles motor inrush without nuisance opening
• 20-amp rating suitable for motor branch circuit and control panel protection
• Interrupting capacity of 300 kA at AC (RMS) and 100 kA at DC
• Cartridge body measures 2 inches overall length and 14.3 mm diameter for standard RK1 holder fitment
• CE Certified, CSA Certified (CSA C22.2 No. 248.12), and UL Listed (Guide JDDZ File E4273)
• Non-indicating body; no visual blown indicator

Compatibility

Designed as an OEM-style replacement or service fuse for Class RK1 fuse holders and fuse blocks rated for cartridge-style time delay fuses at 20 amps.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lock out the circuit before removing or installing any fuse. Verify the fuse holder is rated for Class RK1 cartridge fuses and that the circuit voltage and amperage do not exceed the fuse ratings. Do not substitute a fuse of a different class or higher amperage than the original equipment specification.