Delta Q3 fuse question

[Victor5]

I have a Delta Q3, model #40-650, and I am in need of a new fuse. The fuse markings show it to be a 4 amp, but I would like to know if it's a fast-blow or a slow-blow. Factory was no help with specs, and when I plug in the fuse part number (1347417) into Google, it just gives suppliers, but no specs. TIA.

[Linda In Phoenix]

There was an old post on this forum about the Q3 and a club who has several. Maybe they can help you.
https://forum.scrollsawer.com/forum/...oll-saw-manual

[Victor5]

Thanks! I'll check with them. I have the manual, but it is not specific. It just gives me the part number.

[NC Scroller]

If you can't find out I would opt on the side of caution and get a regular fuse. Fuses of this type are pretty standard and you should be able to find them in your local hardware or auto parts stores.

[JustLarry]

I found this information on fuses in general.

Blowing type. Fast-blow fuses will blow as soon as the current reaches the fuse's amperage rating, while slow-blow fuses are designed to tolerate a large number of startup surges and modest short-term overloads without blowing.
Fast-blow fuses usually have a thin wire while slow-blow fuses usually have a thicker, coiled wire.
You should never substitute a slow-blow fuse for a fast-blow fuse or vice versa.

https://www.youtube.com/watch?v=19Sf0CIZB9A

From this information, fuse may have letter T or F on it. F-fast blow. T-slow. The picture of the fuse you need looks to be a slow blow.
Slow blow may also have a thin wire with what looks like a clump of solder on the wire.

[Jim McDonald]

Twenty years in electronics retail and here is a quick dirty way to tell the difference:
a fast blow will only have the wire element. Slow blow almost always has some extra structure that will be left behind after the fuse blows.
Secondly, there is a series of three letter engraved on one of the end caps and that can be matched.
Rule of thumb is that slow blow will not let go until it reaches 1.5 x the rating. It is to allow high draw items such as motors to come up to speed when the draw is stabilized.
While discussing blown fuses, on a fast fuse, if the wire just separates and the glass is clear, it's about 99% sure it was an overload. However, if the glass is smoked on the interior, chances are there was a short.

[Victor5]

Thank you for all of the replies. Looking at the inside of the fuse, it looks to be a fine wire with a tiny ball of solder on the fine wire. the markings on the end caps of the fuse are:
250V 4A on one end. the other end has: 53S 51S