Time Delay Fuses
Time Delay Fuses
(OP)
I would like to know weather fuses used in motor starters are time delay fuses.Please find the specific fuse type we have used in the attached Image..Are these fuses time delay fuses..?
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RE: Time Delay Fuses
Back in the day we used dual element type time delay fuses for both overload protection and for overcurrent (fault) protection.
Now overload relays are much more dependable and more sophisticated. Time delay fuse back-up is no longer the issue that it was years ago.
A fuse in a listed combination where the normal current is monitored and low level protection provided by the overload relay, does not need to provide good protection at lower current levels.
The purpose of an HRC fuse is to safely interrupt high fault currents. These fuses (HRC) may not be suitable for use in other circuits.
Use of other than HRC fuses in the motor starter may void the listings and approvals and be dangerous in the event of a high current arc.
Bill
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"Why not the best?"
Jimmy Carter
RE: Time Delay Fuses
RE: Time Delay Fuses
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Time Delay Fuses
Slow-blow and fast-blow are descriptions generally reserved for smaller fuses, other than ultra-fast types used in semiconductor applications.
RE: Time Delay Fuses