Circuit breaker with current level indicator

Details Circuit breaker with current level indicator Circuit breaker with current level indicator

1996-10-22

1999-08-17

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340662, 340664, 335 17, 361 86, G08B 2100

Patent

active

059399910

ABSTRACT:
A circuit breaker has line and load terminals and a mechanism which indicates the magnitude of current flowing through the circuit breaker. The mechanism includes a current sensing resistor coupled between the supply and load terminals. An amplifier is coupled to the current sensing resistor and produces a first output signal corresponding to the current magnitude. A first light emitting diode is energized by the first output signal. A first comparator is coupled to the amplifier and produces illumination of a second light emitting diode when the first output signal exceeds a first reference voltage level. A third light emitting diode is illuminated by a second comparator when the first output signal exceeds a second reference voltage level. Thus the number of light emitting diodes that are illuminated indicates the relative level of current conducted by the circuit breaker.

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Article entitled "High-side Current Sense Causes Little Error" by Charles L. Langner, p. 41 EDN Design Ideas, date unknown, admitted prior art.

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