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What is the replacement for a QMB3240, 400 amp switch?

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Replacement of obsolete QMB unit

A 400 amp QMB fusible switch for use in panel boards or switchboard manufactured before 1984 is no longer available. However, we do have a 400 amp 3 pole breaker replacement catalog number that may be considered, catalog number QMB3400LA. A plug on extension assembly catalog number QMB310EX will be required. The QMB3240 took up 12`` of mounting space and the QMB3400LA takes up 7.5`` of mounting space, therefore, you will also need a QW1BL and a QW3BL to cover the 4.5`` of space left from the removal of the QMB3240. However, these old blank fillers are obsolete, no longer available, with no replacement. Suggest installer to have fabrication done at a local sheet metal shop.

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