Fuse replacement with MCB
Fuse replacement with MCB
(OP)
I am doing a project to replace control fuse of circuits with MCB/MCCB's.One of the aim is not to disturb the original design.Due to that i want to replace fuse with breaker of same breaking capacity.my question is that is there critical role for breaking capacity of control circuit fuse.How is it related with the short cicuit breaking capacity of the bus.
The bus in question has two incomers ,one buscoupler & many outgoing modules.
The bus in question has two incomers ,one buscoupler & many outgoing modules.






RE: Fuse replacement with MCB
Rafiq Bulsara
http://www.srengineersct.com
RE: Fuse replacement with MCB
The breaking capacity of the bus is 80 KA whereas fuse breaking capacity is 120KA.the fuse link is 80 KA.
RE: Fuse replacement with MCB
Btw, bus do not have breaking capacity, just withstand capacity.
What is the difference between the fuse and the fuse link?
Rafiq Bulsara
http://www.srengineersct.com
RE: Fuse replacement with MCB
Rafiq Bulsara
http://www.srengineersct.com
RE: Fuse replacement with MCB
You would have to go with an MCCB, and actually a Current Limiting High Interrupting Capacity MCCB to replace your fuses. Basic MCCBs are 14-35kAIC, HIC versions are typically 65kAIC and you need to get to the highest level Current Limiting HIC MCCBs to get to anything that high. For a simple control circuit, be prepared for a 20X cost factor and 10X size factor.
Stick with the fuses.
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RE: Fuse replacement with MCB
RE: Fuse replacement with MCB
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies