Fuse Amp-Trap® 600V 2500A Time-Delay Class L A4BY Series

The Fuse Amp-Trap® A4BY Series is a Class L time-delay fuse designed for protecting service entrance equipment, feeder circuits, and circuit breakers. It is suitable for applications in mains feeders, load centers, panelboards, switchboards, and metering centers. This 600V fuse is rated for continuous currents up to 2500 amperes with a 4-second minimum time delay at 500% rating to handle normal current surges and coordinate with ground fault relays. The A4BY fuse is widely used by electrical distributors and switchgear suppliers for reliable current limiting protection in industrial and commercial electrical systems.

Specifications

• Manufacturer: Mersen
• Manufacturer Part #: A4BY2500
• Voltage Rating: 600VAC, 300VDC
• Amperage Rating: 2500 A
• Interrupt Rating: 200 kA
• Fuse Class: Class L
• Connection Type: Blade
• Mounting Type: Bolted
• Dimensions (L x W x H): 10.75 in x 4.5 in x 4.5 in
• Diameter: 4.5 inches
• Product Weight: 13.82 lbs
• Insulation Material: GMG (Glass Melamine)

Features

• Current-limiting fuse with 4-second time-delay to allow normal surges
• 100% rated for continuous current up to ampere rating
• Unique dimensions prevent replacement by other fuse classes
• Blade stamped catalog numbers for permanent identification
• Glass melamine body and plated terminals ensure reliability in harsh environments
• UL listed and CSA certified for safety and performance

Downloads & Links

• Spec Sheet
• Drawings
• Curves 1
• Spec Sheet FR
• Curves 2