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What is the replacement for a QMB3640?

Issue:
What is the replacement for a QMB3640?

Product Line:
QMB panelboard, switchboard with QMB distribution.

Environment:
Products sold in the United States.

Cause:
Availability, replacement parts.

Resolution:
There is no longer a fusible switch replacement for a QMB3640 400A QMB Series 4 switch for the QMB panel with round busbars. However, if the panel has flat busbars, we do have a QMB3400LA
circuit breaker unit and a QMB310EX plug-on extension assembly to mount the breaker unit. If the panel has the railroad track looking busbars, the replacement would just be the QMB3400LA.
When replacing the QMB3640 you may need filler plates but they are obsolete, no longer available, with no replacement. Suggest installer to have fabrication done at a local sheet metal shop.
 

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