Ferraz Shawmut A4BQ800 800 Amp 600 Volt Class L Time Delay Fuse
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Manufacturer Mersen
Mfg Catalog # A4BQ800
Crawford Part # 113995


  • Fastest operation under short circuit conditions: Let-thru currents are typically 20 percent lower, with a corresponding let-thru energy (clearing I2t) up to 40% lower than the next fastest Class L fuse
  • Time-delay for high inrush loads such as motors and transformers, without nuisance opening
  • 300kA interrupting rating - self-certified, UL witnessed tests
  • Most current-limiting for lowest peak let-thru current; even at fault currents up to 300kA
  • Recommended for Arc Flash energy reduction
  • Pure silver links ensure lowest let-thru current and longer fuse life
  • Easy 2-to-1 selectivity for prevention of nuisance shutdowns and “blackouts”
  • Rejection-style design prevents replacement errors
  • High-visibility orange label gives instant brand recognition
  • Reduced inventory because A4BQ can replace all older types of Class L fuses now in-service
  • Metal-embossed date and catalog number for traceability and lasting identification
  • Fiberglass body provides dimensional stability in harsh industrial settings
  • High-grade silica filler ensures fast arc quenching
  • Optional mechanical TA indicator (100-6000A). Please contact factory for special trigger actuator


  • Mains
  • Feeders
  • Large motors
  • Lighting, heating & general loads
  • Circuit breaker back-up
  • DC rated: UPS DC links, battery disconnects, other DC applications


  • Sell Pack Height: 2.38 in
  • Product Weight: 4 lb
  • Product Diameter: 2 in
  • Product Length: 8.63 in
  • Mounting: Bolted
  • Ampere Rating: 800 A
  • AC Max I.R./Breaking Capacity: I1: 200 kA
  • ROHS Compliant: Yes
  • Sell Pack Weight: 4.2 lb
  • Sell Pack Width: 2.5 in
  • Sell Pack Length: 8.75 in
  • Body/Insulating Material: GMG
  • Connection/Terminal Type: Blade
  • Sell Pack Quantity: 1 Each
  • Speed/Characteristic: Time Delay
  • Fuse Class: Class L
  • Connection/Terminal Material: Silver-Plated Copper
  • Rated voltage AC UL: 600 V
  • Rated voltage DC UL: 500 V

Approvals & Standards

  • UL listed to standard 248-10 File E2137
  • DC listed to UL standard 248 (100-2000A)
  • CSA certified to standard C22.2 No. 248.10 (601-6000A)
  • UL listed
  • Approvals & Standards


UPC 78200193937
Product Description Amp-Trap 2000 A4BQ fuses are 20 percent more current limiting than any other Class L fuse on the market. When correctly coordinated, they bring a superior level of protection to service entrance equipment. Downstream circuit components have maximum protection against short circuit let-thru current. A4BQ's built-in 4-second time-delay characteristic (at 500percent of rated current) accommodates harmless inrush currents with no nuisance opening.
MDM Pkg GTiN 00782001939373
Length 8.63 in
Type Time-Delay
Diameter 2 in
Terminal Type Blade
Applications For Mains, Feeders, Large Motors, Lighting, Heating and General Loads, Circuit Breaker Back-Up, UPS, Battery Circuits
Mounting Type Bolt-On
Weight 4 lb
Pkg Qty 1
Family Brand Name Ferraz Shawmut
Class L
Insulation Material GMG
Construction Fiberglass
Tc Connection Blade
Amperage 800 Amp
Interrupt Rating 200 kA
Terminal Material Silver-Plated Copper
Sub Brand Amp-Trap 2000
Rated Voltage AC 600 V
Rated Voltage DC 500 V
Fuse Class Class L

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