Cooper Bussmann LPN-RK-12SP RK1 Time Delay Fuse 12A

Product Description

The COOPER BUSSMANN LPN-RK-12SP is a Class RK1 cartridge time delay fuse rated at 12 amps for general-purpose overcurrent protection in industrial and commercial electrical systems. The dual-element, time delay design allows the fuse to withstand normal motor inrush currents without nuisance opening while still providing fast response to sustained overloads and short-circuit faults. The cartridge body measures 2 inches in overall length and 0.563 inches in diameter, fitting standard fuse holders designed for RK1-class fuses. This fuse is installed by licensed electricians in motor branch circuits, HVAC equipment, and other inductive load applications requiring Class RK1 protection.

The LPN-RK-12SP is suited for residential and light commercial applications where low-voltage AC or DC branch circuit protection is required. Typical installations include motor control panels, HVAC disconnect boxes, and equipment requiring Class RK1 fusible protection. The non-indicating design is standard for this product type. It mounts via a standard fuse holder compatible with RK1-class cartridge fuses. This fuse is sold individually with a minimum order quantity of 3 units.

Key Features

• Class RK1 dual-element time delay design handles motor inrush without nuisance tripping
• 12-amp rating for branch circuit and equipment protection
• Interrupting capacity of 100 kA at DC and 300 kA at AC (RMS) for high fault-current environments
• Compact cartridge body: 2 inches overall length, 0.563 inches diameter
• Non-indicating fuse body with standard fuse holder mount type
• CE Certified, CSA Certified (CSA C22.2 No. 248.12), and UL Listed (Guide JDDZ File E4273)

Compatibility

Designed as an OEM-style replacement for Class RK1 cartridge fuse positions requiring a 12-amp, time delay, dual-element fuse in a standard fuse holder.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the NEC and applicable local codes. Always de-energize and lock out the circuit before removing or replacing a fuse. Verify the fuse holder is rated for Class RK1 cartridge fuses and confirm the replacement amperage matches the circuit protection requirements before installation. Do not substitute a different fuse class in a holder designed for RK1 fuses, as dimensional and interrupting-rating differences may create a safety hazard.