Patent ID: 7897886

Claim:
A transfer-type switch comprising: a first power input connected to a first power supply; a second power input connected to a second power supply; a movable interlock arrangement positioned between the first and second power inputs and that electrically isolates the first power supply and the second power supply from one another without performing making and breaking of current functions, wherein the movable interlock arrangement is selectively positionable in a first position for supplying power from the first power supply and in a second position for supplying power from the second power supply; and wherein the interlock arrangement includes a plugboard and an isolating plug, wherein the plugboard and the isolating plug include: a first set of sockets electrically connected to the first power supply; a second set of sockets electrically connected to the second power supply; and a set of conductors; wherein the plug may be positioned in the first position such that the conductors are engaged with the first set of sockets or may be positioned in the second position such that the conductors are engaged with the second set of sockets.