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What is the replacement for a QMB3220, Series 4, QMB switch?

Issue:
What is the replacement for a QMB3220 Series 4 QMB switch?

Product Line:
QMB panelboards sold and supported in the USA.

Environment:
Cross reference, replacement.

Cause:
Replacement for obsolete QMB3220.

Resolution:
If the QMB panel board was built before 1961, there is no viable replacement.
If the QMB panel board after 1961, but before 1984, a QMB324, Series D2, QMB switch may be a suitable replacement. The QMB324 requires 9" of panel mounting space and may require a QMB320EX Plug-On Extension Assembly if the existing panel is a 38" wide QW panel board or a free standing switchboard.
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