Press Release

Russelectric, A Siemens Business, Highlights the External Manual Operator (E.M.O.) on Automatic Transfer Switches

Russelectric, A Siemens Business, manufacturer of power control
systems and automatic transfer switches, is highlighting its External Manual Operator (E.M.O.), a
standard feature of the Russelectric RTS-03 Series and RTS-30 Series of open-transition
automatic transfer switches, the most rugged and complete line of 480 VAC 30-cycle and 3-
cycle UL tested switches available today, the company says. The unique External Manual Operator
feature enables easy, safe and quick manual transfer with the door fully closed, significantly
reducing downtime and the risk of arc flash injuries.
With the External Manual Operator, the manual transfer process is much easier and faster for
both the preferred and the alternative power sources, and no special procedures are required to
ensure the system is de-energized during the transfer operation. That means less downtime
because the cabinet door remains closed.
The External Manual Operator utilizes the same Russelectric transfer mechanism as the
automatic electrical operator, a design proven to provide exceptional safety and durability.
During an open-transition transfer, the contact mechanism is securely locked in position until an
over-center position is reached. Preloaded springs then instantaneously open the closed contacts
(quick-break) and instantaneously close the open contacts (quick-make) with only a momentary
break in between.
This quick-break design along with rapid arc quenching features provide for rapid arc
interruption, under maximum voltage and amperage, reducing contact erosion and overheating to
extend useful life. Russelectric transfer switches have the highest 480 VAC 3-cycle closing and
withstand ratings of any switches available today.
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