Fuse Class RK1 20A KWN-R Series

Fast-acting, nonindicating UL Class RK1 fuses open within seconds of being exposed to overloads and short circuits. Also called fast-blow Class RK1 fuses, they are highly sensitive to changes in current flow and don't tolerate temporary overload currents or power surges. 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 20 A
• AC Voltage Rating 250V AC
• DC Voltage Rating 250V DC
• Class RK1
• Series KWN-R
• Visual Indication Nonindicating
• Speed Fast Acting
• Body Style Cylindrical
• Fits Fuse Block Style Rejection
• Interrupt Rating 200kA at 250V AC, 20kA at 250 V DC
• Fuse Size 2 in L x 9/16 in dia
• Length 2 in
• Diameter 9/16 in
• Equivalent Brand and Series Bussmann KWN-R, Littelfuse KLNR, Mersen A2K-R
• Equivalent Series A2K-R, KLRN, KWN-R
• Compatible Fuse Block Series RM250, RM600
• Body Material Melamine
• Element Single
• Standards CE, Guide JDDZ

Manufacturer Details

• Manufacturer: Bussmann
• Condensed Mfg Number: KWNR20
• MPN: KWN-R-20

Label Details

• Hazardous Material: N
• Green Material Flag: N
• COO Name: MEXICO
• TAA Compliant: Y
• Country of Origin: MX
• CA Prop 65 Wht Label: N

Shipping Details

• Ship Weight: 0.40

Classification Details

• Harmonization Code: 8536100040
• GDS Category Name: Class RK1 Fuses
• GDS Family Name: Fuses
• GDS Segment Name: Electrical
• UNSPSC: 39121607
• UNSPSC Class ID: 16
• UNSPSC Commodity Name: Circuit protection devices and accessories
• UNSPSC Commodity ID: 07
• UNSPSC Commodity Name: Glass body 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