A vacuum assembly including a vacuum interrupter may be sealed with a
compliant material and/or rubber plugs, so that a cavity is created and
maintained within the assembly for use with a current exchange housing
and/or bellows, during operation of the vacuum interrupter. During vacuum
molding of the vacuum assembly to encapsulate the vacuum assembly in an
epoxy, a resulting pressure differential caused by the vacuum molding is
prevented from disturbing the seal around the vacuum assembly, by way of
a needle or tube included in the seal. In this way, air from within the
cavity is allowed to escape, while the epoxy is prevented from entering
the cavity. Then, once encapsulation is complete, the vacuum assembly can
be joined with an operating rod and other components to complete a vacuum
switching device.