Patent ID: 7808758

Claim:
A protection device for monitoring current in a power cable to an electrical device and for controlling said electrical device in response to a system remotely located from said protection device, the protection device comprising: (a) a transformer magnetically linked with said power cable connected to said electrical device, said transformer producing an alternating electrical signal at a pair of transformer terminals in response to the presence of a changing current within said power cable; (b) an input circuit electrically connected to said pair of terminals of said transformer and having an output terminal and being electrically connected to said transformer so as to sense said electrical signal, said input circuit producing, in response to sensing said electrical signal, one of a first signal representative of said changing current in said power cable at said output terminal of said input circuit, and a first circuit condition at said output terminal of said input circuit representative of said changing current in said power cable; (c) a switch circuit for sensing at a pair of switch circuit terminals one of a second signal and a second circuit condition of said remotely located system and providing one of a third signal and a third circuit condition, in response to sensing one of said second signal and said second circuit condition, said third signal and said third circuit condition being effective to control said electrical device when said electrical device is electrically connected thereto; and (d) said input circuit, said transformer terminals, and said switch circuit terminals being located within a package, wherein said input circuit, said transformer terminals, and said switch circuit are not readily separated from one another, wherein said input circuit does not include a voltage tap for determining power based upon said electrical signal.