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A4BQ - Class L - Time-Delay

Approvals & Standards
A4BQ (100-6000)
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)
A4BQ (100-6000) - TA
UL listed

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.

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.

Key features & benefits

  • 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

Applications

  • Mains

  • Feeders

  • Large motors

  • Lighting, heating & general loads

  • Circuit breaker back-up

  • DC rated: UPS DC links, battery disconnects, other DC applications

Technical Specifications
Frequency (Hz) 50/60 Hz
Amperage Range 100 to 600 A
Fuse Class Class L
Speed/Characteristic Time Delay
UL Category Code JDDZ

Reference Finder

66 references in this series

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Item number Ampere rating Fuse size Clearing I2t At Rated Voltage Indication System Product weight
A4BQ400 See product
 400A - - No 1.1068kg
A4BQ400-TA See product
 400A - - Yes 1.2701kg
A4BQ4000 See product
 4000A - - No 1.134kg
A4BQ4000-TA See product
 4000A - - Yes 11.6573kg
A4BQ450 See product
 450A - - No 1.1068kg
A4BQ450-TA See product
 450A - - Yes 1.2701kg
A4BQ500 See product
 500A - - No 1.1068kg
A4BQ500-TA See product
 500A - - Yes 1.2701kg
A4BQ5000 See product
 5000A - - No 14.2882kg
A4BQ5000-TA See product
 5000A - - Yes 14.3789kg
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