Specifications

B1
GE Limitamp
®
Medium Voltage Motor Control
Controllers
B
CR194 Vacuum Stationary & Drawout
Features
• Easily removable contactor — The stationary or drawout
contactors can easily be withdrawn by removing easily
accessible bolts. Front access to the coil and tip wear
checks will substantially reduce the need to remove the
contactor in normal circumstances.
• 400 or 800 Ampere Contactor — Vacuum Limitamp control
meets the varying needs of industry including today’s
higher horsepower requirements.
• NEMA rated — Vacuum Limitamp control is fully rated and
designed to meet the requirements of NEMA ICS 3, Part 2
Class E2 controllers.
• UL rated — Vacuum Limitamp control is fully rated and
designed to meet the requirements of UL 347.
• Self-contained power bus — Vertical power bus is a standard
feature of Vacuum Limitamp control. Horizontal power bus
is available within the standard 90-inch height and lines
up with that of previous Limitamp designs. The power bus
ratings have capacity for extended lineups and larger
starter requirements.
• Installation ease — Pr
ovision for cable runs from the top
and bottom; easily accessible terminals and small overall
size make installation fast and easy.
• Proven reliability — Vacuum Limitamp control utilizes the
latest vacuum interrupter technology for long, reliable service.
• Simplified construction — The operating mechanisms
inside Vacuum Limitamp control have been simplified for
further improvements in reliability and ease of maintenance.
• Cooler operation — The reduced power losses of vacuum
interrupters, coupled with other design improvements,
provide a controller that is cooler operating to further
enhance service life.
• Quick-make quick-break non load-break disconnect —
Disconnection of the starter from the main bus is accompa-
nied by a quick-make quick-break non load-break disconnect
switch. This switch improves the overall control integrity by
eliminating the need to rack out the contactor to isolate
the load from the power bus.
• Viewing window — The switch is equipped with a viewing
window for visual assurance that the disconnect contacts
are open, and a full barrier for personnel safety. When the
plunger on the handle is depressed, the CPT secondary is
(isolated) disconnected, which drops out the contactor coil.
Then, when the handle is thrown to the “off” position, the
CPT primary and the high voltage compartment are isolated
from line power.
• Dependable performance — Vacuum Limitamp control is
coordinated to provide the required motor protection func-
tions and offer reliable overcurrent protection against the
damaging effects of overloads and short circuits.
Interrupting Ratings
The interrupting ratings of the controllers vary with the value
of the utilization v
oltage. The following table depicts typical
NEMA E1 (unfused) interrupting ratings for Class E1 controllers.
Table B.1 NEMA Class E1 Interrupting Ratings
In addition to normal motor protective relays, NEMA Class E1
Limitamp control must include instantaneous overcurrent
relays to signal the contactor to open on fault current. NEMA
Class E1 Limitamp control may be employed on systems
having available short-circuit currents up to the interrupting
rating of the contactor.
Relaying, metering, ground fault protection and lightning
arresters are typical of available modifications.
NEMA Class E2 Limitamp control incorporates the high-inter-
rupting capacity of fast-acting fuses. These current-limiting
fuses protect both the connected equipment and control
against the high short-circuit current available from modern
power systems. (See Table B.2.)
Table B.2 NEMA Class E2 Interrupting Ratings
Vacuum Contactors
The vacuum contactors supplied with vacuum Limitamp are
of the magnetically held type. They are fully rated at 400 or
800 amperes in accordance with NEMA and UL standards. The
contactors differ in size, weight and method of termination.
The vacuum interrupters are also different among the various
models and are not interchangeable due to their different
current ratings, and variations in interlock and wire harness
mounting.
The contactor may be serviced in each of the designs avail-
able. This allows easy access for normal maintenance —
such as vacuum interrupter wear checks and replacement
of the operating coil — without removing the contactor. The
only time the contactor needs to be removed is to replace a
vacuum interrupter at the end of its service life.
Contactor Type and Rating
Interrupting Rating rms symmetrical (MVA)
2400 Volts 4200 Volts 5000 Volts 7200 Volts
CR193B Stationary 400 Amp 200 350 400 600
CR193D Drawout 400 Amp 200 350 400 600
CR193C Stationary 800 Amp 200 350 400 —
CR193E Drawout 800 Amp 200 350 400 —
Contactor Type and Rating
Interrupting Rating rms symmetrical (MVA)
2400 Volts 4200 Volts 5000 Volts 7200 Volts
CR193B Stationary 400 Amp 25 43 50 75
CR193D Drawout 400 Amp 25 43 50 75
CR193C Stationary 800 Amp 37 65 75 -
CR193E Drawout 800 Amp 37 65 75 -