I got a service call today for an elevator that was not working. I checked it out and it was a blown fuse. The fuses that were in were one time fuses. All the supply house has was time delays so I replaced it with that to get it going.

What is the differnced between the two and do I need to change it to a one time? The elevator is 3ph 240v and originally dates maybe to 1940 or thereabouts.