yes Paul, cartridge fuses, if you look close at the pullout it has 4 round spots, sort of a circle in a circle.
This holds the 2 fuse clips on each side, the screws where then filled with a rubbery substance.
Said substance will many times be seen to burn off , due to years of constant loading, and four 30 A (green colored) fuses
An observance i've commonly pointed out to justify an upgrade.
pre-date the NEC requirement
pre-date many requirements, but many are still in service here. 30A fuses....K&T wiring....we got it all!
