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The QMB3640 switch is no longer available. There is a 400A circuit breaker device, cat. no. QMB3400LA, which can be retrofitted in its place, in some cases.
Please refer to the latest Supplemental Digest, Section 13 for more information regarding retrofitting.
A plug-on extension assembly, cat. no. QMB310EX, is required. Also, a QW1BL and a QW3BL blank filler would be required. However, these old blank fillers are obsolete, no longer available, with no replacement.
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