5
At the heart of every POWER/VAC switchgear is the vacuum interrupter,
which delivers fast, quiet power switching and precise arc extinction. Oil
gas or high pressure air is not needed to aid interruption, resulting in a
simpler, more reliable breaker.
POWER/VAC breakers feature easy-to-read controls and indicators, an
easily inspected primary disconnect, contact erosion indicator and
precisely tooled breaker mechanisms. A lower compartment roll-in breaker
is available for indoor or walk-in outdoor switchgear.
Standardization and interchangeability of POWER/VAC breakers greatly
simplify maintenance and training. For example, all breakers are the same
size, and most frame parts, primary conductors, disconnects and mecha-
nisms are interchangeable.
The main bus
compartment is
completely isolated
by 11 gauge metal
barriers. Bus bar
s
insulated with high
dielectric epoxy
pass thr
ough track-
resistant polyester
glass barriers
between cubicles.
The secondary dis-
connect combines
the contact reliability
of a plug with the
self-aligning con
-
venience of sliding
contacts.
Current transformers
are located behind
mechanically actu-
ated safety shutters
and a barrier that
isolates the primary
disconnect as the
break
er is moved
into the disconnect
position.
Voltage transformer
trays are automati-
cally grounded on
withdrawal, which
provides isolation
from primary
connections.
Dry type control
power transformers
are insulated with
molded resin epoxy
and mounted in a
drawout tray for
easy access.
Even two-breaker
vertical sections
offer ample space
for terminating up
to two 750 MCM
cables per phase.
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