Cut Sheet

V10-T8-2 Volume 10—Enclosed Control CA08100012E—November 2012 www.eaton.com
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8.1
NEMA Vacuum Break Contactors and Starters
Special Purpose and Mining Rating
Special Purpose and Mining Rating
Contents
Description Page
Special Purpose and Mining Rating
Features and Benefits . . . . . . . . . . . . . . . . . . . V10-T8-3
Standards and Certifications . . . . . . . . . . . . . . V10-T8-3
Catalog Number Selection . . . . . . . . . . . . . . . . V10-T8-4
Cover Control
Non-Reversing . . . . . . . . . . . . . . . . . . . . . . V10-T8-5
Reversing . . . . . . . . . . . . . . . . . . . . . . . . . . V10-T8-6
Contactors . . . . . . . . . . . . . . . . . . . . . . . . . . . . V10-T8-7
Starters
Non-Combination Starters . . . . . . . . . . . . . V10-T8-9
Combination Starters . . . . . . . . . . . . . . . . . V10-T8-12
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . V10-T8-18
Product Description
●
Three-phase magnetic
●
Three-pole full voltage
●
Non-reversing and
reversing
●
600 and 1500 Vac
maximum
●
Starters with
interchangeable heater
OLR
Application Description
Eaton’s vacuum contactors
are designed for starting
and controlling three-phase,
50/60 Hz, AC motors. Motor
full load current should not
exceed the contactor current
rating. These contactors are
built in several versions—
the nameplate on a specific
contactor states the
authorized ratings.
Low voltage vacuum
contactors can be applied to a
wide range of voltages up to
1500V. These applications
include full voltage control of
three-phase squirrel cage
motors, primary control of
low voltage wound rotor
motors and circuit switching
for low voltage capacitors for
power factor improvement.
Operation
The contact structures of
these vacuum break
contactors are located inside
sealed ceramic tubes that
have been evacuated of air.
Any arc occurring across the
contacts upon opening is
automatically extinguished
because ionized air is not
available to sustain it—the arc
breaks when the current
passes through zero. The arc
typically does not survive
beyond the first half cycle
once the contacts begin to
separate. The large arc
chutes normally associated
with starters of this size are
not required. The ceramic
tube with the moving and
stationary contacts enclosed
is called a vacuum
interrupter or a bottle, and
there is one bottle for each
pole of the contactor. A metal
bellows (like a small, circular
accordion) within the bottle
allows the moving contact to
be closed and pulled open
from the outside without
leaking air into the bottle.
Both the bellows and the
metal-to-ceramic seals of
these state-of-the-art bottles
have been refined to the
point where the possibility of
loss of vacuum has been
virtually eliminated.
Contact Force and Altitude
A vacuum contactor is
affected by atmospheric
pressure on the bellows of
the vacuum bottles. Up to an
altitude of 6600 ft, the
contactor is designed to
tolerate normal variations in
barometric pressure. If the
contactor is to be operated
above 6600 ft above sea
level, consult Eaton.