A wire wound resistor arrangement including a plurality of wire wound resistors electrically connected in a series connection, a first terminal disposed at a first end of the series connection of wire wound resistors, and a second terminal disposed at a second end of the series connection of wire wound resistors. The wire wound resistors are arranged in a polygonal shape having at least three vertices the first terminal and the second terminal are disposed at one of the vertices.

A sensor, for measuring current in a conductor, has a stack with at least one isolation layer and at least two metallization layers stacked in a z direction, a first winding of conductive material and a second winding of conductive material, the first and second winding each having first and second parts formed in a metallization layer in the stack and mainly extending respectively in y and z directions and respectively having first and second centers of gravity. The first and second centers of gravity are respectively in first and second planes, wherein the first plane intersects with the second plane in a common intersection line in the second direction. The z direction and the y direction are orthogonal. The sensor has measurer configured to measure current through the first and second winding.

The present invention provides a trip control circuit for a circuit breaker capable of breaking a circuit when a fault current occurs due to a DC current component, as well as an AC current. The trip control circuit comprises a current transformer that has a core allowing a circuit to pass through and a secondary coil for detecting a current flowing on the circuit and providing a current detection signal; an oscillation circuit section that configured to apply an electrical signal to the secondary coil to increase a slope of a hysteresis loop of the current transformer to allow the secondary coil to detect a DC current and an AC current; and a trip determining circuit section that configured to compare a current value indicated by the current detection signal with a predetermined reference current value.

A current sensor includes a current sense coil disposed about a conductive lead, the current sense coil configured to sense a current passing through the conductive lead. The current sense coil includes: a first outer coil configured to detect a first magnetic field generated by the current; a second outer coil configured to detect the first magnetic field, the second outer coil further configured to cancel an electrical field induced in the first outer coil; and an inner conductor disposed between the first outer coil and the second outer coil, the inner conductor configured to detect a second magnetic field generated by the current.

The present invention relates to a busbar adapter for connection to a polyphase busbar system, wherein the busbar adapter comprises a top covering element and a bottom covering element, contact devices and contact lines. The busbar adapter also comprises a current measuring device which is designed such that current measurement can be carried out for each phase of the busbar adapter in the busbar adapter.

According to one aspect, embodiments of the invention provide a current monitoring device comprising a current transformer configured to be removeably coupled to a power line and to generate a reference signal having a level related to a current level of the power line, a sensor circuit connected to the current transformer and configured to convert the reference signal to a measurement signal, a flexible cable having a first end and a second end, the first end coupled to the sensor circuit, and a connection portion coupled to the second end of the flexible cable and configured to be removeably coupled to a communications bus, wherein the sensor circuit is further configured to provide the measurement signal to the communication bus via the flexible cable and the connection portion.

According to one aspect, embodiments of the invention provide a current monitoring device comprising a current transformer configured to be removeably coupled to a power line and to generate a reference signal having a level related to a current level of the power line, a sensor circuit connected to the current transformer and configured to convert the reference signal to a measurement signal, a flexible cable having a first end and a second end, the first end coupled to the sensor circuit, and a connection portion coupled to the second end of the flexible cable and configured to be removeably coupled to a communications bus, wherein the sensor circuit is further configured to provide the measurement signal to the communication bus via the flexible cable and the connection portion.

An electrical current transducer is disclosed which includes a primary conductor bar for carrying the current to be measured, a magnetic core having a magnetic circuit gap, a magnetic field sensor having a magnetic field detector positioned in the magnetic circuit gap, and an insulating housing surrounding the magnetic core and magnetic field sensor. The primary conductor bar has connection terminal ends extending outside of the housing configured for connection to an external primary conductor. The primary conductor bar has a core passage section comprising a fuse portion configured for interruption of the primary conductor if a predefined electrical current is exceeded. The core passage section has a reduced width (W1) in comparison to the connection terminal ends extending outside of the housing thereby providing indents within which at least a portion of the magnetic core is positioned such that a central passage of the magnetic core has a width (W3) less than the width (W2) of the primary conductor connection ends.

An electrical activity sensor attachable to a power cable of an electrical device for detecting an impulse generated in the power cable in response to a change in electrical power state of the electrical device is described. The electrical activity sensor has an antenna assembly including an antenna element operable to magnetically couple with an electrical pulse generated in the power cable, to induce an electrical signal, in response to a change in electrical power state of the electrical device and to wirelessly transmit data representative of the electrical power state change of the electrical device to a remote reader device. The antenna element is a helical shape dipole having at least one turn arranged, in use, around the power cable.

An electrical activity sensor attachable to a power cable of an electrical device for detecting an impulse generated in the power cable in response to a change in electrical power state of the electrical device is described. The electrical activity sensor has an antenna assembly including an antenna element operable to magnetically couple with an electrical pulse generated in the power cable, to induce an electrical signal, in response to a change in electrical power state of the electrical device and to wirelessly transmit data representative of the electrical power state change of the electrical device to a remote reader device. The antenna element is a helical shape dipole having at least one turn arranged, in use, around the power cable.