Use of MVA (k>1) vs Current (K=1) interrupting rating breakers
Use of MVA (k>1) vs Current (K=1) interrupting rating breakers
(OP)
With MVA rated (K>1) being a thing of the past more associated with older Switchgear and new current rated (K=1) being available for new Switchgear or breaker replacements why would anyone want to purchase/install MVA rated breakers for new Switchgear or breaker replacement in older Switchgear?
the reason I ask is that I notice that many of the major manufacturers still offer MVA rated breakers along with the newer K=1 rated breakers. Even when replacing breakers in existing switchgear I believe you can still replace the older breakers with newer K=1 rated breakers in the existing switchgear.
Are there any specific reasons or applications that would justify the use of an MVA rated breaker?






RE: Use of MVA (k>1) vs Current (K=1) interrupting rating breakers
Again this leaves me wondering why with the new vacuum technology would these MVA rated breakers still be offered as opposed to just the K=1 rated breakers. I thought the MVA rated breakers were a relic of air break devices that did not have the same interrupting capabilities that the vacuum breakers now have.
RE: Use of MVA (k>1) vs Current (K=1) interrupting rating breakers