Fuse Class L 300A A4BY Series MPN:A4BY300

Time-delay, nonindicating UL Class L fuses tolerate temporary inrush currents without opening, which prevents nuisance-blowing from motor and equipment startups. Also called slow-blow Class L 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 L fuses protect electrical feeders and service equipment from overcurrent. These 600VAC fuses are not interchangeable with any other UL fuse class. They are current-limiting to prevent electrical damage by disconnecting circuits before they're exposed to the full magnitude and duration of an overcurrent. Class L fuses bolt onto their mountings for a secure hold that resists loosening from vibration and helps ensure proper seating to maintain contact with the circuit.

Technical Specifications

• Item Fuse
• Amps 300 A
• AC Voltage Rating 600V AC
• DC Voltage Rating 300V DC
• Class L
• Series A4BY
• Visual Indication Nonindicating
• Speed Time Delay
• Body Style Blade
• Fits Fuse Block Style Nonrejection
• Interrupt Rating 100kA at 300V DC, 200kA at 600V AC
• Fuse Size 8-5/8 in L x 2 in dia
• Length 8 5/8 in
• Diameter 2 in
• Equivalent Brand and Series Bussmann KLU, Bussmann KTU, Littelfuse KLLU, Littelfuse KLPC, Mersen A4BY
• Equivalent Series A4BY, KLLU, KLPC, KLU, KTU
• Body Material Glass/Melamine
• Element Dual
• Standards CSA, UL

Manufacturer Details

• Manufacturer: Mersen
• Condensed Mfg Number: A4BY300
• MPN: A4BY300

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 L 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