Replacing a 601A fuse with a 600A fuse
- Thread starter Tainted
- Start date
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Typically no.
The 601A is probably a Class L bolt in style. In years gone past the UL listing for fuses didn't allow for ampere ratings to switch between "barrel sizes" so the minimum rating for an 800A barrel Class L was 601A.
However, I believe you can now special order Class L fuses that are 600 and smaller. Check with Cooper or Ferraz.
Why would someone need a class L 601A fuse if the fuse is not a service fuse? Could it be for coordination?
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Yeah, Class L is the key.
Class R fuses max out at 600A, but are not even close to being interchangeable with a Class L. There are fuse reducers available so you can put a 400A fuse into a 600A fuse holder, but until the listing standards changed 601A was the smallest Class L possibility.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Sure or:
Arc Flash mitigation?
Remote tripping availability on bolted pressure switches, which only accept Class L fuses?
A service entrance which has now become a feeder?