Abstract: A method for identifying a type of fault condition with a circuit breaker includes detecting by the circuit breaker a fault condition of a plurality of fault conditions, storing in a memory device a trip code representing a type of the detected fault condition, interrupting current flow through the branch circuit in response to detecting the fault condition, and receiving a reset of the circuit breaker. The trip code may then be displayed in response to a momentary press of a test button that is a short duration press, and activating an LED interface in the circuit breaker to indicate the trip code representing the type of the detected fault condition.

Abstract: A method for identifying a type of fault condition with a circuit breaker includes detecting by the circuit breaker a fault condition of a plurality of fault conditions, storing in a memory device a trip code representing a type of the detected fault condition, interrupting current flow through the branch circuit in response to detecting the fault condition, and receiving a reset of the circuit breaker. The trip code may then be displayed in response to a momentary press of a test button that is a short duration press, and activating an LED interface in the circuit breaker to indicate the trip code representing the type of the detected fault condition.

Abstract: A system and method are provided to detect a fault on a circuit. A current sensor is provided for sensing current on at least one line conductor and/or a neutral conductor on a circuit, and a switch is operated between at least first and second positions to selectively control a signal pathway on the at least one line conductor or the neutral conductor in relations to the sensor. The sensor performs a first current measurement corresponding to current across one conductor from the at least one line conductor and the neutral conductor in the first position, and a second current measurement corresponding to a current balance or imbalance between the conductors in the second position. The current sensor outputs the first current measurement for detecting an arc fault in the first position, or the second current measurement for detecting a ground fault in the second position.

Abstract: A system and method are provided to detect a fault on a circuit. A current sensor is provided for sensing current on at least one line conductor and/or a neutral conductor on a circuit, and a switch is operated between at least first and second positions to selectively control a signal pathway on the at least one line conductor or the neutral conductor in relations to the sensor. The sensor performs a first current measurement corresponding to current across one conductor from the at least one line conductor and the neutral conductor in the first position, and a second current measurement corresponding to a current balance or imbalance between the conductors in the second position. The current sensor outputs the first current measurement for detecting an arc fault in the first position, or the second current measurement for detecting a ground fault in the second position.

Abstract: A single current transformer arc fault/ground fault sensing circuit utilizes a sense coil and an injection coil from the line conductor placed concentrically and overlapping on a common core. The injection coil is operated by an in-line switch to allow current flow into the injection winding to influence the sense coil. With both the line and return conductors of a single phase circuit being surrounded by the transformer, opening the switch allows a ground fault sampling period, while closing the switch allows an arc fault sampling period.

Abstract: Method and system for performing arc fault and ground fault detection in a dual function CAFI/GFCI circuit breaker uses two analog-to-digital converters (ADC), one for performing arc fault sampling and one for performing ground fault sampling. Each ADC operates independently of the other ADC and may be accessed as needed by the microcontroller without interfering with the operation of the other ADC. Such simultaneous use of multiple ADCs minimizes or eliminates the need for complex time slicing and similar control schemes, thus freeing up the microcontroller for other operations and fault detection related tasks.

Abstract: A single current transformer arc fault/ground fault sensing circuit utilizes a sense coil and an injection coil from the line conductor placed concentrically and overlapping on a common core. The injection coil is operated by an in-line switch to allow current flow into the injection winding to influence the sense coil. With both the line and return conductors of a single phase circuit being surrounded by the transformer, opening the switch allows a ground fault sampling period, while closing the switch allows an arc fault sampling period.

Abstract: Method and system for performing arc fault and ground fault detection in a dual function CAFI/GFCI circuit breaker uses two analog-to-digital converters (ADC), one for performing arc fault sampling and one for performing ground fault sampling. Each ADC operates independently of the other ADC and may be accessed as needed by the microcontroller without interfering with the operation of the other ADC. Such simultaneous use of multiple ADCs minimizes or eliminates the need for complex time slicing and similar control schemes, thus freeing up the microcontroller for other operations and fault detection related tasks.