Table

Class L Fuse Ratings and Applications

Class L Fuse Ratings and Applications reference with assumptions and boundary notes.

Reference boundary

Class L label reference only. It does not select service equipment protection, replacement fuse size, holder, or switch rating.

Reference table

Read common Class L fuse label fields for large ampere cartridge fuses.

Reference basis uses manufacturer Class L fuse literature summarized as label-reading fields.
Label fieldField meaningTypical valueBoundary
Voltage ratingCommon large-fuse voltage label600 VClass L label reference only; actual product marking governs use
Typical ampere rangeCommon large cartridge fuse range above 600 A601 A to 6000 AClass L label reference only; actual product marking governs use
Current limitingCurrent-limiting fuse wording on some productsCurrent limitingClass L label reference only; manufacturer curves govern let-through
MountingLarge fuse block or switch referenceLarge fuse blockClass L label reference only; equipment label and holder data govern use
Time-delayDelay characteristic on some productsTime-delayClass L label reference only; manufacturer curves govern response
Use notes
  • Use this table for preliminary reference and arithmetic checks only.
  • Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.