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Section 9 – Auto Transfer Switchgear (LIS-ATS) Configuration
When supplied, the LIS-ATS configuration consists of two motor-operated BreakMaster Load Interrupter Switches
and, in the middle, a control panel section connected by a common load side bus. This arrangement allows the
automatic selection of either of two incoming lines (Normal or Emergency).
Lower section of the control panel section consists of a bus arrangement for cable exit as well as for bus connection
of two motor-operated LIS switches. Upper section of control panel consists of an MX250 module, RT box and
relays, which help the product to detect the current supply and to give the signal to toggle the switch for restoring
the power supply. Upper door of control panel consists of indication lamps, Auto/Manual selector switch and
Reset push button to show the status of and to control ATS manually.
As standard, this arrangement is supplied with key interlocking for safe operation. Key interlocking normally consists
of a lock on each switch and a lock on each door. Each of the locks is keyed alike and only one key should be
available to operating personnel. Since the key is retained in its lock when a switch is closed or a door is opened, this
requires that both switches must be locked in the open position to unlock either main door, preventing access to
energized load side bus or fuses. See GE Zenith Operation and Maintenance Manual #71R-2000A for more information.
WARNING
Only one key should be available to operating personnel for this interlock scheme.
When shipped from the factory, each lock will have a separate key. All extra keys
must be destroyed or otherwise made inaccesible to operating personnel. Failure
to do so could result in severe injury or death.
!
BreakMaster Load Interrupter Switch
