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Manufacturer Mersen
Mfg Catalog # A4BQ900
North Coast Part # 153894


  • 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: 3.25 in
  • Product Weight: 4.55 lb
  • Product Diameter: 2.5 in
  • Product Length: 10.75 in
  • Mounting: Bolted
  • Ampere Rating: 900 A
  • AC Max I.R./Breaking Capacity: I1: 200 kA
  • ROHS Compliant: Yes
  • Sell Pack Weight: 4.78 lb
  • Sell Pack Width: 3.38 in
  • Sell Pack Length: 11 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 78200193005
Family Brand Name Ferraz Shawmut
GTiN 00782001930059
Length 10.75 in
Type North American Power Fuses
Diameter 2.5 in
Terminal Type Blade
Applications Mains Feeders Large motors Lighting, heating & general loads Circuit breaker back-up UPS Battery Circuits
Mounting Type Bolted
Weight 4.55 lb
Pkg Qty 1
Class L
Insulation Material GMG
TC Connection Blade
Amperage 900 Amp
Interrupt Rating 200 kA
Terminal Material Silver-Plated Copper
Sub Brand Amp-Trap 2000, SmartSpot
Rated Voltage AC 600 V
Rated Voltage DC 500 V
Fuse Class Class L
Voltage null

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