General Description - Marathon TS 910 Owner's Manual

TS 910 TRANSFER SWITCH

4 GENERAL DESCRIPTION

TS 910 Automatic Transfer Switches employ a power contactor switching unit with a microprocessor
based controller to automatically start a generator and transfer system load to a generator supply in
the event of a utility supply failure. System load is automatically re-transferred back to the utility
supply following restoration of the utility power source to within normal operating limits. All load
transfer sequences are "Open Transition" (i.e. "break-before-make") utilizing an in-phase transfer
detection control sequence.
The TS 910 series transfer switches use a type TSC 9 microprocessor based controller. All
necessary control functions for fully automatic operation are provided by the TSC 9 transfer
controller. The TSC 9 controller is mounted inside the transfer switch enclosure and operating
status is provided via LED indicators that are visible though a front panel opening on NEMA 1 rated
enclosures. For detailed information on the TSC 9 Transfer Switch controller, refer to Section 18 of
this manual.
The standard TS 910 series Automatic Transfer Switch is rated for 100% system load and is suitable
for control of motors, electric discharge lamps, tungsten filament lamps, and electric heating
equipment where the sum of motor full-load ampere ratings and the ampere ratings of other loads do
not exceed the ampere rating of the switch and the tungsten load does not exceed 30 percent of the
switch rating.
Service Entrance Rated TS 910 Automatic Transfer Switch models are supplied with a utility supply
circuit breaker with over current protection. Refer to Section 17 of this manual for detailed
information on over current protection.
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PM140 REV 2 14/01/23 Thomson Power Systems