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EATON CORPORATION Cutler-Hammer
Chiller Starter (AMPGARD) Technical Data TD02003003E Effective: October 2006
Type SL 200/400 Ampere Vacuum Contactor Bolt-in
FIGURE 1. BOLT-IN CONTACTOR REAR/SIDE VIEW
SL 200/400 Ampere Vacuum Contactor
Cutler-Hammer Type SL Vacuum Contactors were designed and
engineered specifically for use in AMPGARD starters. They are self-
supporting, compact, drawout, 3-pole, dc magnet closed contactors.
To permit application matching of the starter to the motor rating, the
SL Contactor is available in 200 ampere and 400 ampere ratings.
SL Contactors are available in the standard bolt-in configuration and
optional stab-in design. Either bolt-in or stab-in designs can be sup-
plied in a two-high configuration, with a starter maximum of 400 full
load amperes. The total structure rating cannot exceed 720 amperes
for a combination of two starters.
Design
Cutler-Hammer Vacuum Contactors are highly versatile, low-chop
contactors that have been designed to meet all applicable NEMA
standards and are UL
recognized components. The contactors
accommodate mechanical interlocks which function with the starter
isolation switch and with other contactors. These interlocks provide
unmatched safety and service protection.
The contactors consist of a molded frame with moving armature,
magnet and vacuum interrupters. The contactor is easily positioned
into the starter and long-life vacuum interrupters provide many opera-
tions with a minimal maintenance program. The SL operating coils are
energized by a control board which provides a pulse-width-modulated
dc output. Control voltages and contactor dropout times are pro-
grammed using a DIP switch located on the control board. The con-
trol board is mounted in a protected cavity in the molded contactor
frame to prevent inadvertent access to the voltage and dropout DIP
switch. Four auxiliary contacts (2NO, 2NC) are supplied with each
contactor and are wired to terminal blocks on the starter control panel.
The vacuum interrupters employ special main contact materials that
exhibit a low chop current plus other specially engineered characteris-
tics that minimize switching surges. Surge protection is therefore not
required due to the use of the vacuum contactor. Surge protection
may be required for other reasons such as the high probability of
lightning strike, etc.
Maintenance
Reduced maintenance is one of the outstanding features of the
Cutler-Hammer Vacuum Contactor line. The special contact material
in the vacuum interrupters provides long life even under severe oper-
ating conditions. The main coils operate with a very low temperature
rise to maximize insulation life. Steel bearings on the main shaft
provide long, trouble-free operation.
A simple go/no-go gauge is used for checking contact wear. Wear
can be checked without removing the contactor from the starter. The
vacuum contactor is much lighter than previous generation airbreak
or vacuum contactors, which allows for easier insertion and removal
from the starter structure.
Contactor Control Board
DIP Switch on Contactor Control Board
