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TS 870 Transfer Switch
PM062 REV 11 16/04/19
14
Thomson Power Systems
For further information on the TSC 900 Transfer Controller, refer to separate instruction manual
PM151.
4.2.
ATS POWER SWITCHING MECHANISM
Four types of ATS power switching mechanisms are provided with TS 870 Series ATS based
on amperage size and optional features supplied with the ATS as described below.
4.2.1. “S”- STYLE ATS MECHANISM (100A-800A, OPEN TRANSITION)
The ATS mechanism consists of 2 power
switching devices which are mounted in a
horizontal (i.e. side-by-side) configuration. The
ATS mechanism provides a positive
mechanical interlock to prevent both power
switching units from being closed at the same
time. The ATS mechanism utilizes a single
120VAC reversible gear motor drive which is
mounted in between the two power switching
devices. The transfer switch gear motor utilizes
the power from the source to which the
electrical load is being transferred. The gear
motor drives a common drive hub assembly
which in-turn operates the power switching
device toggles via independent operating arms.
Two limit switches are utilized to disconnect
control power to the gear motor once correct
operating positions are reached.
On 100-250A transfer mechanisms, the load-side of the power switching devices are
interconnected via power cable. On 400-800A transfer mechanisms, the load-side of the power
switching devices are interconnected via bus bars. The TSC 900 transfer controller provides a
standard neutral position delay timer to allow adequate voltage decay during transfer operation
to prevent out of phase transfers
Summary of Contents for TS 870
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