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What is the difference between the suffix TW and TD for QMB switches?
Issue:
Can I use a switch with TD suffix , for a TW switch, or visa versa?

Product Line:
QMB Panels

Environment:
QMB Switches.

Cause:
Product features

Resolution:
The TW is a suffix on the current design Series E QMB twin switches and TD is a suffix for the obsolete design Series D2 QMB twin switches.  They are not interchangeable.

Schneider Electric USA

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