Air v Moulded Case
Air v Moulded Case
(OP)
We have to get an incoming device for a board.
Normally it’s easy, 1kA and down get MCCB, 2kA and up get ACB but this one is 1.6kA and ACB and MCCB will both deal with the load current and fault levels.
Anybody got a view on other things I should consider in making my choice?
Normally it’s easy, 1kA and down get MCCB, 2kA and up get ACB but this one is 1.6kA and ACB and MCCB will both deal with the load current and fault levels.
Anybody got a view on other things I should consider in making my choice?





RE: Air v Moulded Case
Power circuit breakers are maintainable, MCCBs are not.
Obviously the MCCB will be much less expensive.
RE: Air v Moulded Case
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Sometimes I only open my mouth to swap feet...
RE: Air v Moulded Case
RE: Air v Moulded Case
That's a bit harsh!
The other thread has been flagged for deletion.
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Sometimes I only open my mouth to swap feet...
RE: Air v Moulded Case
RE: Air v Moulded Case
RE: Air v Moulded Case
its not as simple..
Items to consider and evaluate are:
Cost
application
degree of reliability required
maintainability required ( ACB are maintainable)
electrically operation required or not
Plug in, bolt-on, drawout, stationary- what is important to you
Short circuit ratings- switchboard or switchgear?
Short time ratings- for coordination purposes
ACB have more flexibilty to help coordination
Size of equipment (space )
RE: Air v Moulded Case
His suggestion is a 1600 mccb incomer with dummy trip unit (so basically a switch only) and relying on the upstream device at the transformer for protection. The board will have two 800A switchfuses as outgoing devices.
My initial suggestion was ACB incomer and MCCB outgoing but, as always, cost is an issue
At the end of the day, he’s got to be happy paying for it but I’ve got to be happy building it