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Mersen Products

Low Voltage UL/CSA Fuses

Class L

A4BQ - Class L - Time-Delay

Amp-Trap 2000 A4BQ fuses are 20% 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 500% of rated current) accommodates harmless inrush currents with no nuisance opening.

Features :-
  • Fastest operation under short circuit conditions: Let-thru currents are typically 20% 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)
  • Most current-limiting for lowest peak let-thru current; even at fault currents up to 300kA
  • 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 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 arcquenching
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