Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
1999-06-25
2001-07-31
Leja, Ronald W. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
C029S762000
Reexamination Certificate
active
06268991
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to circuit breakers, and, more particularly, to a method and arrangement for customizing electronic circuit interrupters.
Multifunctional electronic circuit interrupters, such as described in U.S. Pat. No. 4,672,501 entitled Circuit Breaker and Protective Relay Unit, are capable of providing a plurality of optional protection functions, such undervoltage, overvoltage, phase loss, phase imbalance as well as remote control and indication functions, such as shunt trip, bell alarms and the like. Most commercial applications using such circuit interrupters do not require all the accessory functions and options, such that the circuit interrupters are usually customized for each specific function.
U.S. Pat. No. 5,500,781 entitled Digital Circuit Interrupter with Multiple Accessory Function, describes the use of selection switches that allow factory as well as field selection of the preferred protection and accessory options. Normally-open switches connect through OR logic gates with options circuits, allowing the selected functions to become operational through selected switch closure. This manual selection arrangement is sufficient when a limited number of circuit interrupters are employed.
The automatic insertion of electronic components within printed circuit boards in a high speed manufacturing process is described within U.S. Pat. No. 3,676,746 entitled Compatible Modular Circuit Board Connector, and U.S. Pat. No. 4,670,977 entitled Inserter Device for Electronic Components.
SUMMARY OF THE INVENTION
In an exemplary embodiment of the invention, an electronic circuit interruption device having a plurality of protection, indication and control options includes a dedicated printed circuit board having electrical connection with operating circuits controlling each of the several options. Electrical connections between the operating circuits and the circuit interruption controller are made through corresponding dedicated resistors. The resistors are arranged at a predetermined edge of the printed circuit board for access by means of an arbor tool sized to overlay the resistors for removal thereof without interfering with the circuit board substrate. Option selection is obtained by removal of resistors connecting with non-selected circuits on the printed circuit board. Logic is provided to the arbor by a computer-controlled stepper motor. When large numbers of circuit interrupters require specific protection, indication and control options, selection using the method of the present invention can be made early in the circuit interrupter manufacturing process at substantial cost savings over the prior art.
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Criniti Joseph
Larranaga Javier I.
Messerli Alan
Wambolt Lee
Cantor & Colburn LLP
General Electric Company
Horton Carl B.
Leja Ronald W.
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