Eaton ATC-900 - Operator Panel and Display Menus; General Panel Layout and Components; LED Status Indicators; Pushbutton Functions

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Instructional Booklet
Page 12 Effective: August 2014
ATC-900 Magnum Tranfer SwitchO&MManual
3.2.4 TRANSFER MECHANISM
The transfer switch uses Eaton Magnum power case switching
devices and power case switches with a stored-energy mecha-
nism. An electrical operator automatically recharges the mecha-
nism after the switching device has been closed, and an indicator
on the switch shows whether it is in the OPEN or CLOSED posi-
tion and the status of the stored energy mechanism.
The switching device is closed by energizing a solenoid that
releases the spring mechanism. A shunt trip will open the switch-
ing device if energized.
Figure 13. Terminal Connections for a Typical Drawout Transfer Switch (800-3200A Closed Transition Shown).
Figure 13a. Terminal Connections for a Typical Drawout Transfer Switch (4000A Shown).
SOURCE 1
CABLE
CONNECTIONS
LOAD CABLE
CONNECTIONS
SOURCE 2
CABLE
CONNECTIONS
NEUTRAL BOND
IF REQUIRED
NEUTRAL
GROUND
CABLE
CONNECTIONS
CABLE
CONNECTIONS
NEUTRAL
ASSEMBLY
NORMAL
CABLE
CONNECTIONS
LOAD CABLE
CONNECTIONS
EMERGENCY
CABLE
CONNECTIONS
NORMAL
LOAD
NEUTRAL