Ferraz Shawmut A4BT800 Current Limiting Time Delay Fuse

Description:

The Ferraz Shawmut A4BT800 Fuse is a Class L current-limiting time-delay power fuse rated at 800 Amps and 600 VAC, designed to provide overcurrent and short-circuit protection for high-capacity electrical distribution systems. Commonly installed in motor control centers (MCCs), switchboards, distribution panels, transformers, feeders, and industrial power systems where high interrupting capacity and inrush current tolerance are required. Maintenance technicians and system integrators use this fuse for equipment repair, retrofit, expansion, and replacement to protect electrical equipment, improve system reliability, and minimize downtime. The A4BT800 features a 200 kA interrupting rating at 600 VAC and a 10-second time-delay characteristic, making it suitable for protecting motors and other inductive loads with high starting currents.

Applications:

The Ferraz Shawmut A4BT800 Fuse is used to protect industrial electrical systems against overloads and short circuits while allowing temporary inrush currents during motor startup. It is commonly utilized in motor control centers, transformers, feeders, switchgear, HVAC equipment, industrial machinery, manufacturing plants, and commercial power distribution systems requiring UL Class L current-limiting fuse protection.

Technical Specifications:

• Manufacturer: Ferraz Shawmut (Now Mersen)
• Part Number: A4BT800
• Product Type: Class L Time-Delay Current-Limiting Fuse
• Current Rating: 800 A
• Voltage Rating: 600 VAC / 500 VDC
• Interrupting Rating: 200 kA AC / 100 kA DC
• Fuse Class: UL Class L
• Time Delay: 10 Seconds at 500% Rated Current
• Terminal Type: Blade
• Body Material: Glass Melamine Tube
• Standards: UL 248-10, CSA C22.2 No. 248.10
• Installation: Bolt-In Class L Fuse Holder
• Application: Main, Feeder, Motor, and Transformer Protection

Common Replacements:

• Bussmann KLU-800
• Littelfuse KLPC800
• Edison LCL800