Appeal No. 1996-4118
Application 08/ 084,255
a base, and
(ii) if it is a field effect transistor, comprises a drain, a source and
a gate, and
ii. controls the line current;
(b) a voltage divider which is connected to the source and drain or to the emitter and
collector of the switching transistor, and
(c) a control transistor which
i. is selected from bipolar transistors and field effect transistors, and
(i) if it is a bipolar transistor, comprises a collector, an emitter and
a base, and
(ii) if is a field effect transistor, comprises a drain, a source and a
gate,
ii. has its base or gate voltage determined by the voltage divider,
iii. control the base or gate voltage of the switching transistor; and
iv. is turned on by a voltage across the collector and emitter or source and
drain of the switching transistor resulting from an overcurrent through the
switching transistor, thereby causing the switching transistor to put the arrangement in
a non-conductive state, and
(d) a voltage source which is applied to the base or gate of the switching transistor
and which biases the switching transistor into or toward conduction in normal
operation; and
(3) is capable of being reset from the non-conducting state into a conducting state by a remotely
controlled interrupting means which interrupts current in the line of the circuit to be protected.
3
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