Fuse Class RK1 225A LPN-RK-SP Series MPN:LPN-RK-225SP

Time-delay, nonindicating UL Class RK1 fuses tolerate temporary inrush currents without opening, which prevents nuisance-blowing from motor and equipment startups. Also called slow-blow Class RK1 fuses, they open to disconnect an electrical circuit when exposed to sustained loads and short circuits. They have no indicator for identifying a blown fuse, so they're sometimes used with an indicating fuse block or cover.

UL Class RK1 fuses are more current-limiting than RK5 fuses to react more quickly to overcurrent. These fuses are the same size as Class H and K fuses, but have a rejection feature that prevents an accidental downgrade from a current-limiting system. Their modified terminals ensure a match with the rejection clips in Class R fuse holders that prevent the installation of fuses with a lower interrupting capacity. They're typically used in newer equipment, but can also be used with a Class H fuse holder to upgrade older installations from Class H or K fuses for improved overcurrent protection. These fuses are current-limiting to prevent electrical damage by disconnecting circuits before they're exposed to the full magnitude and duration of an overcurrent.

Technical Specifications

• Item Fuse
• Amps 225 A
• AC Voltage Rating 250V AC
• DC Voltage Rating 250V DC
• Class RK1
• Series LPN-RK-SP
• Visual Indication Nonindicating
• Speed Time Delay
• Body Style Blade
• Fits Fuse Block Style Rejection
• Interrupt Rating 100kA at 250V DC, 300kA at 250V AC
• Fuse Size 8-5/8 in L x 2-3/8 in dia
• Length 8 5/8 in
• Diameter 2 3/8 in
• Equivalent Brand and Series Bussmann LPN-RK-SP, Littelfuse LLNRK, Mersen A2D-R
• Equivalent Series A2D-R, LLNRK, LPN-RK-SP
• Compatible Fuse Block Series HM600, R250
• Body Material Melamine
• Element Dual
• Standards CE, UL Special Purpose Guide JFHR, Guide JDDZ, File E4273, CSA Class 1422-02, File 53787, CSA C22.2, No. 248.12

Manufacturer Details

• Manufacturer: Bussmann
• Condensed Mfg Number: LPNRK225SP
• MPN: LPN-RK-225SP

Label Details

• Hazardous Material: N
• Green Material Flag: N
• Country of Origin: MX
• CA Prop 65 Wht Label: N

Classification Details

• Harmonization Code: 8536100040
• GDS Category Name: Class RK1 Fuses
• GDS Family Name: Fuses
• GDS Segment Name: Electrical
• UNSPSC: 39121604
• UNSPSC Class ID: 16
• UNSPSC Commodity Name: Circuit protection devices and accessories
• UNSPSC Commodity ID: 04
• UNSPSC Commodity Name: Time delay fuses
• UNSPSC Family ID: 12
• UNSPSC Family Name: Electrical equipment and components and supplies
• UNSPSC Segment ID: 39
• UNSPSC Segment Name: Electrical Systems and Lighting and Components and Accessories and Supplies

Shipping Details

• Not For Sale In: HI AK PR