FORM 1 An enclosed assembly to provide protection against contact with internal parts, where no internal separation is provided.
FORM 2 As Form 1, but with separation of all functional units from one another
FORM 3 As Form 2, but with separation of all functional units from one another
FORM 4 As Form 3, but the incoming and outgoing terminals are also required to be separated from the Busbar system, and from one another
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