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|300 kA interrupting rating, self certified (UL witnessed)|Most current limiting for lowest peak let-thru current, even at fault currents up to 300 kA|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 (when used with recommended fuse blocks)|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 arc quenching|Silver plated copper contact