disconect preference
- Thread starter arnettda
- Start date
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fishin' electrician
Senior Member
- Location
- Connecticut
Fuse manufacturers will tell you one thing, breaker manufacturers will tell you another. I'd weigh costs and ease of installation of each since either will do the job.
bphgravity
Senior Member
- Location
- Florida
Fusing may give you some better fault clearing characteristics, but need to be replaced and you run the risk of single-phasing the system. It really boils down to design preference and cost.
weressl
Esteemed Member
Fuses need replacement when they 'blow', circuit breakers can be just re-closed after the fault is investigated and cleared. Mismatched fuses can create problems. Fuses T/C characteristic is closer to the transformer thermal damage curve so protection can be tailoired closer to it. As the result they will better limit the let-through current in some regions than circuit breaker, so the arc flash hazard's magnitude is limited better than CB's.
CD's will be smaller than fused disconnect, but more costly initially.
boboelectric
Senior Member
- Location
- Eighty Four,Pa.15330
Typical feeder installation in say a mall is a m.c.c. center (breakers) feeding a fusible discnnect to protect a xmfr that feeds a circuit breaker MDP.
charlie
Senior Member
- Location
- Indianapolis
Also, there is a lot of consternation about not being able to reset fuses so they have to be replaced. It has been my experience that most of the time you never have a problem with an overcurrent device unless you are trouble shooting. 
- Location
- Massachusetts
As an installer I prefer breakers as they are almost always more compact than the equivalent fused disconnect.
If I was EC paying the bills I would leaning toward fused disconnects.
If I was the customer in most cases I would want breakers for their ability to be reset without having to find new fuses quickly at what might be off hours.
The customers that we work with that specify fused disconnects often also specify spare fuses for all disconnects.
If I was EC paying the bills I would leaning toward fused disconnects.
If I was the customer in most cases I would want breakers for their ability to be reset without having to find new fuses quickly at what might be off hours.
The customers that we work with that specify fused disconnects often also specify spare fuses for all disconnects.
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