Compare 8-1393249-8 & 7-1393159-3

Power Circuit Protection
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7-1393159-3 = TYPE 1
8-1393249-8 = TYPE 4
The diameter of the recommended cutout is different.
See Page 3 of 3
Type 1 = .440 - .450" DIA. (11.2 - 11.4mm) cutout
Type 4 = .470 - .480" DIA. (11.9 - 12.2mm) cutout
Datasheet