Abstract: A combined toroid/shunt device for detecting residual current in an electrical installation comprising a plurality of conductors such as a live conductor (2) and a neutral conductor (3) is described. The device comprises a toroid means (1, 4) for detecting an AC residual current within a first range and a plurality of resistive shunts (6a) to (6d) for connection in respective ones of the plurality of conductors. A current detection means (5, 7, 13) responsive to current flowing in each of said shunts for detecting a DC residual current and/or an AC residual current within a second range is described. The first range of AC residual current is an AC residual current resulting from earth leakage or cross-leakage between conductors up to a saturation level at which the toroid or electronic means associated means therewith becomes saturated. The second range includes an AC residual current of said saturation level.

Abstract: A current sensing device and a residual current detection device are described having a temperature compensation capability so that residual current can be directly measured to a high degree of precision in the background of a high load current. The residual current device comprises a plurality of resistive shunts for connection in respective ones of a plurality of lines through which current can flow to and from a load, and a detector means sensitive to the voltage developed across each of the shunts to detect any imbalance between the currents flowing through the shunts.

Abstract: A residual current detection device comprising a plurality of resistive shunts for connection in respective ones of a plurality of lines though which current can flow to and from a load, and detector means sensitive to the voltage developed across each of the shunts to detect any imbalance between the currents flowing though the shunts.

Abstract: A current sensor which has a rigid metallic link member having two end portions of conductive material and an intermediate portion of resistive material interconnecting the end portions. An integrated circuit analog to digital converter is mounted on the link member. The converter has analog input terminals for connection to respective ones of the two end portions of the link member and digital output terminals for connection to a processing apparatus.

Abstract: A current sensing device and a residual current detection device are described having a temperature compensation capability so that residual current can be directly measured to a high degree of precision in the background of a high load current. The residual current device comprises a plurality of resistive shunts (14) for connection in respective ones of a plurality of lines through which current can flow to and from a load, and detector means (15) sensitive to the voltage developed across each of the shunts to detect any imbalance between the currents flowing through the shunts. The temperature compensation means (15h) is provided for facilitating compensation for fluctuations in shunt resistance with variations in temperature. The current sensor comprises a rigid metallic link member having two end portions (13) of conductive material and an intermediate portion (14) interconnecting the end portions.