Current Limiting vs Time Delay Fuses

[PhaseShift]

Can someone explain the difference between current limiting and time delay fuses. Where are each typically used? What is typically used on control transformers and such items?

Am I correct in also thinking that there is also an instantaneous type of fuse?

 

[mivey]

The Bussman has all the info you might want:
Here is one link:
http://www.bussmann.com/library/arcflash/SPDFuseOperation.pdf

They have a nice library of info.

 

[jim dungar]

Can someone explain the difference between current limiting and time delay fuses. Where are each typically used? What is typically used on control transformers and such items?

Am I correct in also thinking that there is also an instantaneous type of fuse?

The standard naming of fuse types is "non-time delay" and "time delay".
These are describing how the fuse reacts to medium levels of currents (usually starting about 6X). Current limiting deals with how fast the fuse extinguishes the arc. The current limiting portion of a fuse curve usually occurs at .01sec.