TS 910 TRANSFER SWITCH
PM140 REV 0 12/02/09 6 Thomson Technology
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 requires
upstream over current protection.
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.
4.1. PRODUCT MODEL CODE
The type of TS 910 series transfer switch supplied is identified by way of a 11 digit product
code which appears on the equipment rating plate (MODEL) on the inside of the door of the
transfer switch. The model code structure is as follows:
Model Number Amperage Voltage*
Standard
ATS
Service
Entrance
Rated ATS 2 Pole
3 w ire w ith
Neutral 50/60Hz
Nema 1
Enclosure
TS912A0100A
100A 120/240V
TS912A0100B
100A 120/240V
TS912A0200A
200A 120/240V
TS912A0200B
200A 120/240V
TS912A0400A
400A 120/240V
TS912A0400B
400A 120/240V
*Configurable for 120/208V System Voltages