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General Description
Application
The Cutler-Hammer AMPGARD medium voltage metal-enclosed
control family from Eaton's electrical business provides control and
protection of medium voltage motors and equipment rated 2300 to
6600 volts nominal/7200 volts maximum.
AMPGARD control has a complete metal-enclosed offering:
Full and reduced voltage starting of medium voltage motors up to
8000 hp.
Integral LBS load break available as main, tie or feeder. The LBS
can be supplied as fused or un-fused.
Features
Personnel safety : Positive mechanical isolating switch with visible
disconnect completely grounds and isolates the starter from the line
connectors with a mechanically driven isolating shutter, leaving no
exposed high voltage. Medium voltage door is mechanically locked
closed with the disconnect; low voltage section has separate door
and is segregated from the medium voltage section.
Ease of installation: Current limiting fuses, contactor assembly and
isolating switch assembly are easily removed from the enclosure; line
and load terminals are completely accessible from the front.
Ease of maintenance: All components are front accessible,
facilitating routine inspection and/or parts replacement. The low
voltage compartment is painted white as standard to maximize
serviceability.
Simplicity of design: Component-to-component design eliminates
half of the electrical connections.
Time-proven contactor technology: Two vacuum contactor ratings
are utilized, 200 ampere and 400 ampere. Contactors are available
as stab-in or bolt-in design.
High degree of isolation: Main bus is located in separate compart-
ment on top of lineup. Vertical bus is barriered in rear of starter and
auxiliary compartments. Load cables are isolated from adjacent starter
in two-high sections. A vertical low voltage wireway is provided for
isolation of customer control wiring. The low voltage control compart-
ment is isolated from medium voltage by steel barriers.
AMPGARD Motor Control Assembly
Starter catalog types are available for the following applications:
Squirrel cage, full voltage (reversing and non-reversing).
Squirrel cage, primary reactor.
Squirrel cage, autotransformer.
Reduced voltage solid-state.
Personnel Safety Features
One of the most important considerations in designing the Cutler-
Hammer AMPGARD starter was personnel safety. The result is an
extensive system of interlocks and other safety features.
2
EATON CORPORATION Cutler-Hammer Chiller Starter (AMPGARD) Technical Data TD02003003E Effective: October 2006
Interlocks
Interlocking on AMPGARD starters includes:
Isolating switch mechanism locks the medium voltage door
closed when the switch is in the ON position.
Provision for optional key interlocks.
When door is open, interlock prevents operating handle from
being moved inadvertently to ON position.
When contactor is energized, isolating switch cannot be opened
or closed.
Other Safety Features
AMPGARD starters include many additional features designed to
protect operating personnel. These features include:
Provision for a padlock on the isolating switch handle in OFF position.
Shutter barrier between line terminals and isolation switch stabs is
mechanically driven.
Distinctive marking on back of switch assembly appears when
shutter barrier is in position and starter is completely isolated from
the line.
Grounding clips provide a positive grounding of the starter and
main fuses when the isolating switch is opened.
High and low voltage circuits are compartmentalized and isolated
from each other.
The drawout isolation switch is easily removed by loosening two
bolts in the back of the switch. The shutter remains in place when
the switch is withdrawn.
Isolation Switch
Operating Shaft
Mechanical
Interlock with
Contactor
Isolation Switch Handle
Removable Cover Allows
Access to Bolted Line Side
Connections
Distinctive Marking
when Shutter is in
Closed Position
Shutter Mechanism and Finger Barrier Isolation of Incoming Line Bus
(Shown with Removable Portion of Isolation Switch Removed)
Isolation
Switch Door
Locking
Mechanism
Shutter Operated by
Stab Motion when Isolation
Switch is in Position
Motion of Shutter
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