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01.4IB.46300
Equipment Description
FlexTrol
™
Class E2 Medium Voltage Controllers with
Eaton Contactor
The Eaton Type SL 400A Medium Voltage
vacuum contactor and isolating switch
combinations will accommodate the R-Type,
and the E-Type bolt-in fuses as standard and
clip-mounted hookeye fuses as an option,
and
. The Eaton
Type SL 400A and the Eaton Type SL 800A
Medium Voltage vacuum contactors are
similar in design with the exception that the
Type SL 800A design application consists of
higher capacity current carrying parts. Fuse
maintenance for the two applications is similar.
The Eaton Type SL 800A application uses the
current limiting fuse types: ACLS, CLS70, and
AHLE. A dual voltage rating allows the fuses
to be used in both the 2400 and 4800 volt
systems.
NOTICE
The 400A & 800A medium voltage vacuum
contactors are not interchangeable.
Vacuum contactors are magnetically operated
by the application of either AC or DC power,
depending upon circuit requirements. The
contactors may be operated by DC from
rectifiers included with the equipment. The
minimum closing voltage is 85% of the coil
rated voltage. The dropout voltage will vary
considerably between the AC and DC magnets,
but the dropout voltage for the AC magnet
could be as high as 60% of the coil-rated
voltage.
A mechanically latched contactor function
(optional) is used when the vacuum contactor
must stay closed during severe under-voltage
conditions. Applications include fire pumps
and transformer feeders. The latched contactor
is available with or without a manual or
electrical release and latch.
g. M
anual
i
solation
s
witcH
FlexTrol
™
follows the NEMA definition and
contain means for manually isolating the
power circuit by operation of a disconnecting
device. The manual isolating mechanism of
FlexTrol enables personnel to isolate the power
circuit with a manually operated
three-pole, primary circuit disconnecting
device. The controller isolation switch is a
non-load break device. Mechanical and
electrical interlocks are provided to ensure that
the main contactor is deenergized before the
switch can be operated. In the open position,
the switch isolates medium voltage from
the main controller compartment, allowing
access to the controller for inspection and
maintenance. For standard applications, the
isolation switch includes ground fingers that
ground the line side of the power fuses when
the switch is in the open position. The isolation
switch has a mechanical endurance rating of
10,000 operations. Isolation switches in starters
with double-barrel fuses are supplied with
additional phase barriers that must be installed
to maintain the proper dielectric rating of the
starter.
Figure 4
Eaton Type SL Medium Voltage
Vacuum Contactor 400A
