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What is the difference between a QMB364 and QMB364W Fusible Switch?

If I have an exisitng QMB364 switch , can I use the Series E1 QMB364W Switch? 

Product Line:
QMB Panelboards.

QMB Switches.

Product Design Features

The QMB364 Series D2 , 200A switch , is a replacement for the QMB3620 Series 1-4 switch.

Due to the drastic QMB364 Series D2 design differences, a Current Series E1, or greater Series QMB364W switch, cannot be used in place of a Series D2 switch.

The QMB364W is electrically equivalent to the QMB364 and older QMB3620, but current Series E1 , and D2 are not interchangeable.
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