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How to convert an 8538SFA21 non-fusible size 4 combo starter to fusible?

Can you add a fuse block on a non-fusible 8538SFA21 size 4 combo starter to convert to fusible?

Product Line:
Class 8538 Type SF Series C Combination Starter

Products sold and used in the United States

You cannot add a fuse block on the combo starter. You have to swap out the complete switch as the fuse block is integral of the switch.

Complete disconnect switch part number is 3105536650.  
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