Selection of CD Circuit breaker
Selection of CD Circuit breaker
(OP)
Hello,
Is there any recommendation to select a DC circuit breaker?
In a facility there have been some trips and nobody knows the reasson.
The only clue is that DC circuit breaker only has "instantaneous element" settable between 1600 and 3200 A and operates at almost 1 cycle.
Why DC circui breakers do not have thermal element?
Any answers or clues will be welcome!
Is there any recommendation to select a DC circuit breaker?
In a facility there have been some trips and nobody knows the reasson.
The only clue is that DC circuit breaker only has "instantaneous element" settable between 1600 and 3200 A and operates at almost 1 cycle.
Why DC circui breakers do not have thermal element?
Any answers or clues will be welcome!






RE: Selection of CD Circuit breaker
I've seen DC breakers without thermal settings used in UPS systems but I've also seen many other applications where a thermal trip unit is used.
RE: Selection of CD Circuit breaker
Rafiq Bulsara
http://www.srengineersct.com
RE: Selection of CD Circuit breaker
Another possible reason is that the battery protecting the critical installation is itself only protected against catastrophic faults such as a dead short, at which point the load is already lost.
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If we learn from our mistakes I'm getting a great education!
RE: Selection of CD Circuit breaker
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.