Patent ID: 8094425
Filing Date: 2012-01-10
Classification: G03B,G03F,H01H,H02H

Abstract:
1. 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 suitable for connection to said electrical device, said transformer producing an electrical signal at a pair of terminals thereof 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 be suitable for sensing 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 suitable for sensing 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 suitable for being effective to control said electrical device when said electrical device is electrically connected thereto; and (d) said input circuit, said pair of terminals of said transformer, and said switch circuit being located within a single unitary package; wherein said input circuit is free from determining a value of power based upon said electrical signal.