Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1995-02-06
1997-01-21
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 64, 361115, H02H 300
Patent
active
055964737
ABSTRACT:
An electrical switch with overcurrent protection communicates as a slave with a remote master station by sending return messages to the remote master station only in response to messages addressed to it. A portable unit plugs into the electrical switch and disables communications between the electrical switch and the remote master station. The portable unit then establishes communications with the electrical switch by sending a global message to the electrical switch requesting the unique address at successive baud rates until a return message containing the electrical switches' address is received. A communications module in the electrical switch transfers to a master mode in response to the global message in order to send the return message containing its unique address. It then reverts to the slave mode for response to subsequent messages from the portable unit containing the unique address. Either the remote master station or the portable unit can test the circuit breaker by sending a message containing a digital test current to the circuit breaker.
REFERENCES:
patent: 4747061 (1988-05-01), Lagree et al.
patent: 4751605 (1988-06-01), Mertz et al.
patent: 4870531 (1989-09-01), Danek
patent: 4958252 (1990-09-01), Murphy
patent: 5101316 (1992-03-01), Levain
patent: 5270898 (1993-12-01), Elms et al.
patent: 5309312 (1994-05-01), Wilkerson et al.
Boccabella Michael F.
Engel Joseph C.
Johnson Richard A.
Oravetz David M.
Wise James I.
Eaton Corporation
Gaffin Jeffrey A.
Jackson Stephen W.
Moran Martin J.
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