Abstract Apparatus for selectively disconnecting the electric service of individual customers from an electric power supply line by electrical signals transmitted from a central point remote from the customer's premises. A circuit interrupter, such as a circuit breaker or, preferably, a fuse, is connected in series with the circuit of each of the customers, and is operated by a coded signal, transmitted from the central point by radio waves or over telephone or power lines, which is received by apparatus at the customer's premises and thereupon actuates the interrupter. Preferably, the coded signal is transmitted to the customer's premises using the same apparatus used to remotely read the customer's utility service meter, such being an Automatic Remote Meter Reading (ARMR) system of a known type which would also be installed. Also, novel remotely operable fuses which are particularly suited for use as the circuit interrupter in the system are described.
A remotely operable fuse comprising a fuse body, a pair of spaced electrically conductive members on said body forming electric contacts, electrically conductive fusible means having a pair of opposite ends one of which is electrically connected to one of said contacts and the other of which is electrically connected to the other of said contacts, said electrically conductive fusible means comprising a pair of non-fusible electrically conductive members, one member being electrically connected to and extending from said one of said contacts and the other member being electrically connected to and extending from said other of said contacts to adjacent said one member, and a pellet of fusible metal disposed between and electrically connecting said members, an electrically energizable heating element adjacent to but spaced from said fusible means intermediate said ends thereof, said heating element having a pair of terminal ends at least one of which is electrically isolated from said fusible means, and means for connecting said terminal ends of the heating element to a source of electrical energy for thereby energizing said heating element and causing fusing of said fusible means.
Claim 2
Dependent Claim
185 words
A remotely operable fuse comprising a fuse body, a pair of spaced electrically conductive members on said body forming electric contacts, electrically conductive fusible means having a pair of opposite ends one of which is electrically connected to one of said contacts and the other of which is electrically connected to the other of said contacts, said electrically conductive fusible means comprising a pair of non-fusible electrically conductive members, one member being electrically connected to and extending from said one of said contacts and the other member being electrically connected to and extending from said other of said contacts to adjacent said one member, and a pellet of fusible metal disposed between and electrically connecting said members, an electrically energizable heating element adjacent to but spaced from said fusible means intermediate said ends thereof, said heating element having a pair of terminal ends at least one of which is electrically isolated from said fusible means, and means for connecting said terminal ends of the heating element to a source of electrical energy for thereby energizing said heating element and causing fusing of said fusible means.
Claim 3
Dependent Claim
31 words
A remotely operable fuse as set forth in claim 1, wherein said heating element comprises a helically wound coil of wire extending around and spaced from said members and said pellet.