If you need a slo-blow a fast blow will burn out when the device is turned on. A slo-blow will not protect a device that calls for a fast-blow. You should always use the type of fuse the device calls for.
Fast/Slow fuse?
I was looking for two kinds of fuses, one slow blow (10A, 250V) and one fast blow (4mA (?), 250V). Went to RadioShack and found that they had fast blow type fuse for 10A/250V and slow blow type for the other.
I just bought them anyway.
What would be the worst possible problem of using fast blow fuse instead of slow blow fuse, and vice versa?
I just bought them anyway.
What would be the worst possible problem of using fast blow fuse instead of slow blow fuse, and vice versa?