Abstract: A novel voltage switching device operable under a first and a second source voltages is disclosed. The device, which is capable of converting one of the source voltages to the design voltage of an electrical appliance when the two are different, comprises a connector having voltage indicators representing the first and the second voltage switching positions, respectively; and a voltage switching plug having a groove and a pair of fuses for the different source voltages. The connector, in one of the embodiments, may have two pairs of guide slots arranged in a perpendicular relationship between the two pairs. The plug may have a pair of complementary members apt to be selectively engaged with any one pair of the slots when the plug is coupled with the connector. The plug can be accurately coupled with the connector in the first or the second source voltage position based on a simple reading of the corresponding voltage indicator through the groove provided in the cover.

Abstract: A selector fuse to be used in an ordinary fuse socket, having a cup-shape body with an exterior screw threaded sheath thereon. A plurality of (3) contact fuse members in the interior are connected with the sheath. A rotatable shaft has a contact finger engaging the fuse members successively upon rotation of the shaft. The fuse members are spring biased radially inwardly, and yieldingly maintain engagement with the finger, and have detent formations yieldingly holding the shaft in set position. Additionally, the fuse members are so shaped as to block reverse rotation of the shaft. The fuse members may be of different, or the same, fusing values, as desired.

Abstract: A multiple fuse device having a multiple fuse assembly within the device rotatable about an axis in fixed directions through at least a certain predetermined angle and having at least two rotational positions in which at least one fresh fuse is connected between an electrical source and a load circuit, the improvement characterized by the assembly having a body with a conductor carrying portion having a plurality of radially extending angularly spaced apart separate conductors carried by said portion, at least three adjacent ones of said conductors being connected in a set in series each to its adjacent conductor by fuse means and at least one of the conductors in this set being connected with the source and an adjacent conductor simultaneously being connected with the load circuit to fusibly connect one line of the load circuit with the electrical source when the assembly is in a selected rotational position.