Fuse Class RK5 50A ECNR Series ECNR50

These 250VAC UL Class RK5 fuses are time delay and nonindicating. They tolerate temporary inrush currents without opening, which prevents nuisance-blowing from motor and equipment startups. Also called slow-blow Class RK5 fuses, these 200kA IR fuses 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 RK5 fuses provide moderate current limitation for general use applications where more current-limiting RK1 fuses aren't needed. These fuses have an interrupting rating (IR) of 200kA and 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. They 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 50 A
• AC Voltage Rating 250V AC
• DC Voltage Rating 125V DC
• Class RK5
• Series ECNR
• Visual Indication Nonindicating
• Speed Time Delay
• Body Style Cylindrical
• Fits Fuse Block Style Rejection
• Interrupt Rating 200kA at 250V AC, 20kA at 125V DC
• Fuse Size 3 in L x 13/16 in dia
• Length 3 in
• Diameter 13/16 in
• Equivalent Brand and Series Bussmann FRN-R, Edison ECNR, Littelfuse FLNR, Mersen TR-R
• Equivalent Series ECNR, FLNR, FRN-R, TR-R
• Compatible Fuse Block Series R250
• Body Material Fiberglass
• Element Dual
• Standards CE, CSA Certification Class 1422-01, UL 248-12 Guide JDDZ

Manufacturer Details

• Manufacturer: Bussmann
• Condensed Mfg Number: ECNR50
• MPN: ECNR50

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: 0.11

Classification Details

• Harmonization Code: 8536100040
• GDS Category Name: Class RK5 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