Circuit breaker warning relay and control accessory - gives visual indication of impending overcurrent condition with sufficient time for manual intervention to prevent damage

摘要

Double diodes are connected to the outputs of first operational amplifiers equal in number to the input terminals. The double diodes have first outputs connected in parallel with each other and in series with one input to a second operational amplifier having ON and OFF states, another input to the second operational amplifier being connected to a reference voltage. An indicator diode connected to an output from the second operational amplifier for providing indication of the ON state of the latter.