External Manual Operator (E.M.O.) on Automatic Transfer Switches

November 1, 2022

The 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 in the market today. The unique E.M.O 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 E.M.O, the manual transfer process is 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 E.M.O 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 instantly open the closed contacts and instantly close the open contacts 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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