Non's are fast acting, good for solid state and resistive (linear) loads Wouldn't put non's anywhere near a motor See similar questions with these tags. It was fused with a general purpose fuse and now it's fused with a time delay However in this case it's pretty close I would say it's fine but you shouldn't normally do it without checking.
Yes, those are just brand name differences in nomenclature for the same fuse Bussmann frn‑r series fuses provide motor overload, ground fault and short‑circuit protection The grooved ring in the ferrule and the slot in the knife blade, when used in conjunction with special fuseholders designed to accept class r fuses only, prevent accidental interchanging of any other fuse class. This means class rk1 allow less damaging energy to pass through them while opening (blowing). Using 15 amp fuses in a 30 amp circuit could lead to the fuses blowing frequently or, worse, overheating and potentially causing a fire hazard It's crucial to match the fuse rating to the circuit amperage.
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