Abstract: Certain exemplary embodiments can include an arc fault detection circuit. The arc fault detection circuit can include a zero crossing analysis sub-system including a counter configured to determine, for a first waveform, a count of dips that occur between a pair of predetermined zero crossings of a second waveform. The second waveform can be obtained from an electrical circuit.

Abstract: A circuit breaker system 10 (FIG. 1) using electronic trip units 35 is disclosed. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled, and/or monitored by a central computer. Further, the electronic trip units 30 include a data acquisition circuit 100 (FIG. 4) that uses chopping to provide better accuracy and increased dynamic range of current measurements.

Abstract: A circuit breaker (10) (FIG. 1) has a power line (12) for carrying a power signal from a source to a load and a current transformer (14, 16, 18, 20) configured to sense the power signal and provide a sense signal based on the power signal at a first terminal (14a, 16a, 18a, 20a) (FIG. 2). The circuit breaker (10) includes a control circuit (26) configured to receive a first data message and to provide a second data message based on the first data message at a second terminal (40). The circuit breaker (10) further includes a programmable amplifier (30) coupled to the first terminal (14a, 16a, 18a, 20a) and the second terminal (40) configured to receive the sense signal, to receive the second data message, to amplify the sense signal based on the second data message, and to provide the amplified sense signal at a third terminal (42). A method of constructing the circuit breaker (10) is provided (FIG.

Abstract: A circuit breaker system 10 (FIG. 1) using electronic trip units 35 is disclosed. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled, and/or monitored by a central computer. Further, the electronic trip units 30 include a data acquisition circuit 100 (FIG. 4) that uses chopping to provide better accuracy and increased dynamic range of current measurements.

Abstract: A circuit breaker system 10 (FIG. 1) using electronic trip units 35 is disclosed. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled, and/or monitored by a central computer. Further, the electronic trip units 30 include a data acquisition circuit 100 (FIG. 4) that uses chopping to provide better accuracy and increased dynamic range of current measurements.