Home > Blog > Class T and J Fuse Holder Product Modification

Class T and J Fuse Holder Product Modification

July 8, 2022

Marathon Special Products is announcing a minor change to our 100-600Amp, Class J&T Fuse Holders. This product change is due to new tooling needed to maintain the product line, manufacture it more efficiently, as well as utilize a sustainable/recyclable material for the insulator base. This will be a running change that has no effect on part numbers or agency certification. These changes will only affect the part numbers noted below. The changes are as follows:

Old Version New Version
Insulator Material Laminated General Purpose Phenolic Thermoplastic, Glass filled Polycarbonate
Insulator RTI Rating 130°C 125°C
Insulator Surface Finish Dull top/bottom, rough cut side edges Flat/matte
Recyclable/Sustainable Materials No Yes
Weight Baseline existing models 23% reduction (average)
Modularity (ability to snap together single poles) No Yes
3-Pole Construction (where applicable) Single Piece Modular, Interference fit of 3-single poles
Depth (for all models) Baseline existing models .27” increase +/-.06
Width (for all models) Baseline existing models .11” increase +/-.06
Height Same
Mounting Locations Same
Other Component Materials Same
Catalog Numbers Same
UL File Numbers Same

This will be a running change with no variance to the part numbers or ratings.

It is estimated that these product changes will occur around the dates noted in the table below, but could vary considerably depending on when inventories of the existing design are depleted.

Part Numbers Affected and Estimated Implementation Date:

Catalog Number Description Est. Implementation Date
T100A1B 300V, 100A, T-Class, 1-Pole 8/15/22
T100A3B 300V, 100A, T-Class, 3-Pole
T200A1B 300V, 200A, T-Class, 1-Pole
T200A3B 300V, 200A, T-Class, 3-Pole
T400A1B 300V, 400A, T-Class, 1-Pole
T400A3B 300V, 400A, T-Class, 3-Pole
6T600A1B 600V, 600A, T-Class, 1-Pole
6J6001BFBD 600V, 600A, J-Class, 1-Pole
6J6003BFBD 600V, 600A, J-Class, 3-Pole
T600A1B 300V, 600A, T-Class, 1-Pole 9/26/22
6T400A1B 600V, 400A, T-Class, 1-Pole
6J400A1BFBD 600V, 400A, J-Class, 1-Pole
6J400A3BFBD 600V, 400A, J-Class, 3-Pole
6T100A1B 600V, 100A, T-Class, 1-Pole 5/1/2023
6T100A3B 600V, 100A, T-Class, 3-Pole
  • Some catalog numbers may or may not list dashes or spaces in catalog nomenclature.

Please feel free to email or call with any questions regarding this product modification.

See official product modification notification here: July 2022 - Marathon Special Products Modifies 100-600Amp, Class J&T Fuse Holders.

View More Product Notifications