Cooper Bussmann LPS-RK-3SP Time Delay Fuse 3A RK1

Product Description

The COOPER BUSSMANN LPS-RK-3SP is a time delay cartridge fuse rated at 3 amps and classified as RK1, designed for general-purpose overcurrent protection in demanding electrical systems. With an overall length of 5 inches (127 mm) and a body diameter of 20.6 mm, this dual-element fuse mounts in a standard fuse holder and delivers high interrupting capacity: 100 kA at DC and 300 kA at AC (RMS). The dual-element, non-indicating construction provides reliable short-circuit and overload protection. Licensed electricians and electrical maintenance technicians are the primary installers for this type of fuse in industrial and commercial panel and control applications.

This fuse is suited for use in commercial and industrial electrical systems where RK1-class protection is required. The time delay characteristic allows it to tolerate temporary inrush currents — such as those from motor starting loads and transformer energization — while still responding quickly to sustained fault conditions. It is a common choice for motor branch circuit protection, HVAC control panels, and industrial equipment feeders where reliable, high-interrupting-capacity overcurrent protection is required.

Key Features

• RK1 class fuse with dual-element time delay design for motor and transformer protection
• 3-amp rating with 100 kA interrupting capacity at DC and 300 kA at AC (RMS)
• Cartridge body: 5 inches (127 mm) overall length, 20.6 mm diameter
• Non-indicating construction for standard fuse holder mounting
• CE Certified, CSA Certified (C22.2 No. 248.12), and UL Listed (Guide JDDZ File E4273)
• General-purpose classification suitable for a broad range of overcurrent protection applications

Compatibility

Designed for use in RK1-class fuse holders accepting cartridge fuses with a 5-inch (127 mm) overall length and 20.6 mm body diameter.

Installation Notes

Installation and replacement of this fuse should be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Always de-energize and lock out the circuit before removing or installing the fuse. Use an appropriately rated fuse puller rated for the voltage class of the circuit. Verify that the replacement fuse matches the amperage, class, and interrupting rating required by the overcurrent protection design of the circuit.