A switching device includes: an electronic trip unit; an actuator; a switching mechanism connected via the actuator to the electronic trip unit; a stationary contact; a mobile contact, which is coupled to the switching mechanism; and an alarm module. The alarm module includes: a first, a second, and a third connector; a first relay having a first contact which is connected to the first connector and having a second contact which is connected to the second connector; a second relay with a first contact which is connected to the third connector; and a control unit which is coupled on an output side to a control side of the first relay and to a control side of the second relay, and on the input side to the electronic trip unit.

A current measurement device including current sensors positioned around current conductors in order to form a passage for the current conductors along an axis oriented in a first direction and a differential current sensor positioned around the set of current conductors in order to form a common passage for the current conductors along an axis oriented in a second direction. The current sensors and the differential current sensor are located in spaces that are separated by an interface plane. A method for manufacturing such a current measurement device, to a protection module and a differential circuit breaker including such a device.

A module for detecting an electrical fault includes a housing; a first conductor and a second conductor; a first measurement toroid, positioned around the first conductor and around the second conductor, for measuring a differential current flowing between the first and second conductors; a second measurement toroid, positioned around the first conductor, for detecting an electric arc signal flowing through this conductor; a relay; an electronic processing circuit configured to switch the relay according to the current measured by the measurement toroids. The measurement toroids are aligned with one another and the first toroid takes the shape of an elongated tube and allows the differential protection to operate with its own current.

A circuit interrupter includes separable contacts, a trip actuator structured to cause the separable contacts to trip open, a conductor structured to carry power through the circuit interrupter, a sensor having a forward bias voltage drop inversely proportional to temperature and being disposed proximate the conductor, an amplifier circuit electrically connected to the sensor and being structured to amplify the forward bias voltage drop of the sensor, and a comparator circuit structured to compare the amplified forward bias voltage drop with a predetermined reference voltage and to output a signal to the trip actuator when the amplified forward bias voltage drop is less than or equal to the predetermined reference voltage. The signal causes the trip actuator to cause the separable contacts to trip open.

Devices and methods are provided which facilitate detecting of a disturbance parameter being outside a predetermined range. Such disturbance parameter may for example cause dependent failures in redundant circuits, for example redundant circuits being arranged on a same substrate.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to move the switchable contact to an open position in response to a predetermined electrical condition.

A circuit breaker having, in a current path, a switching device having a thermal and/or magnetic tripping device for interruption of a current circuit having the current path comprehensive in an event of overcurrent or short-circuit, wherein a functional component of the switching device connected into the current path is bridged by means of a bypass which carries the load current detected by means of a current sensor when the current is below a current threshold, and is shut off when the current threshold is exceeded.

Embodiments of the disclosure provide a current protection device with a mutual reactor including a first winding and a second winding. The current protection device is a subcomponent of a previously developed fault current limiter. The current protection device protects the superconductor from potential damage. The current protection device may include a coil electrically connected in series with the first winding or the second winding, an actuator mechanically coupled at an output of the coil, and an electrical interrupter electrically connected to the first and second windings, wherein the actuator is communicatively coupled with the electrical interrupter to actuate a moveable contact of a set of breaker contacts of the electrical interrupter. In some embodiments, the first and second windings are arranged in parallel to one another. In some embodiments, the coil is electrically coupled to an output of the first winding or the second winding.

A method of establishing, and recording, the cause of a power interruption to the load in solenoid-operated electronic miniature circuit breakers of various types without extensive digital resources is presented. In some designs of electronic miniature circuit breakers a circuit breaker trip event will change the inductance of the trip solenoid. This change will take place for an electronic trip or a mechanical trip. A record of the electronic trip signal issued to the solenoid will be present to check against and differentiate the occurrence of an electronic trip from a mechanical trip. The mechanical trip occurs without the electronics and is also indicated by the change in inductance. Thereby, the cause of the power interruption can be determined, recorded and reported.

A circuit breaker includes at least one coil for measuring electric current of an electrical conductor of an electrical circuit, connected to a control unit which compares the measured current or its equivalent with a first current limit value. Upon the first current limit value being exceeded, the control unit initiates an interruption of the electrical circuit. The two terminals of the coil are connected via a series circuit which has a first switch opened in its basic state, a voltage source and a voltage indicator. The control unit is designed such that, when a second current limit value is undercut and a first period of time is exceeded, the first switch is closed for a second period of time, the voltage indicator compares the voltage present with a first voltage value and, when the latter is exceeded, delivers information on the absence of faults of the coil.