Importance

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Abstract

Disclosed is an automatic transfer switch (ATS) having 'operate,' 'test' and 'isolate' positions for the switch per se. A handle selects one of the positions and a mechanical linkage couples the ATS and the handle to one another. In the improvement, the linkage has first and second members for applying motive force to the switch. The mechanical linkage has first and second rotary driver devices in engagement with the first and second members, respectively, thereby providing redundant switch-positioning mechanisms. The new ATS may be combined with a bypass switch having 'normal,' 'auto' and 'emergency' contact positions. A switch interlock linkage extends between the transfer switch and the bypass switch and includes a bypass plate and a transfer plate coupled to one another by a bar. The bypass switch includes a pivot-mounted first bypass interlock member obstructing substantial movement of the bypass plate when the bypass switch electrical contacts are in the 'normal' position. And the transfer switch includes a pivot-mounted first transfer interlock member obstructing substantial movement of the transfer plate when the transfer switch electrical contacts are in the 'emergency' position.

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First Claim