How many rail extension pieces are included in a 40520-288-52 assembly and how many assemblies are required per switch ?

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Issue:
Rail extension pieces included in a 40520-288-52 assembly and assemblies required per switch

Product Line:
QMB Panelboards

Environment:
Products sold in North America

Resolution:
Two rail extensions are included in each kit. One of these kits is provided with each switch as standard. That switch requires 7.5 inhces of mounting space.