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Equipment Description
01.4IB.65131
e. v
AcuuM
I
nterrupterS
PowlVac 38
™
ARM Series 4 circuit breakers
utilize sealed vacuum interrupters to control
the primary circuit. Some vacuum interrupters
appear to be identical in size and shape
externally, but types vary in rating due to the
differences in their internal construction.
f. v
AcuuM
I
nterrupter
c
onnectIon
Connection to the vacuum interrupter
stems is made by means of copper vacuum
interrupter blocks. The multi-contact bands
inside the upper vacuum interrupter block
make contact with this block and the upper
stem of the vacuum interrupter. The upper
primary disconnecting devices are then
assembled to the vacuum interrupter block.
Another copper vacuum interrupter block with
primary disconnecting device is mounted to
the bottom or moving stem of the vacuum
interrupter. The multi-contact bands in the
lower vacuum interrupter block make contact
with the inside of the block and the moving
stem of the vacuum interrupter. The multiple
parallel paths of the multi-contact bands keep
the current density low.
