A circuit interrupter includes separable contacts; an operating mechanism; an electronic trip unit; and a current sensor assembly including: a harvester circuit having a primary conductor through which input current passes, a secondary winding and a harvester core structured to saturate at a first input current level, a Rogowski coil structured to measure voltage at an output of the Rogowski coil, the measured voltage indicative of output current of the Rogowski coil, where linearity of the output of Rogowski coil deviates more than a deviation tolerance based at least in part on saturation of the harvester core at the first input current level, and a compensation coil arranged at 180 degree opposite to the secondary winding of the harvester core, the compensation coil structured to delay saturation of the harvester core until the input current reaches a second input current level higher than the first input current level.

Provided are a fuse and a circuit system. The fuse includes: a housing, a closed chamber being provided in the housing and being filled with an arc extinguishing filler, and a first conductive terminal and a second conductive terminal which are used as a current input end and a current output end being respectively connected to the housing; a melt which is connected in series between the first conductive terminal and the second conductive terminal, at least part of the melt being disposed through the closed chamber; and an impact apparatus, which is arranged in the housing, is positioned outside the closed chamber, and is configured to act, when receiving an excitation signal, on the melt to generate an impact force to make the melt break in the closed chamber.

A power management system for home, apartment, facility and building circuits includes a grid inter-active system comprising a cord, an electrical connection to an outlet, and a connection to an external power producing appliance. In addition, the system includes a communication or automatic interface associated with a system that detects power outages or other grid or time related event.

A power management system for home, apartment, facility and building circuits includes a grid inter-active system comprising a cord, an electrical connection to an outlet, and a connection to an external power producing appliance. In addition, the system includes a communication or automatic interface associated with a system that detects power outages or other grid or time related event.

A switch assembly has a switch; and a servo drive system for the switch. The servo drive system includes: a motor configured to drive the switch; a power section configured to supply power to the motor; and a control unit configured to control the power section depending on at least one desired value. The control unit is configured to identify the presence of at least one safety-relevant event and, in the case of the safety-relevant event, to transmit at least one control signal to the power section. The power section is configured to initiate or carry out at least one safety measure depending on the control signal.

A low voltage circuit breaker is provided. The low voltage circuit breaker includes a contact system with a first contact and a second contact that are electrically connectable and disconnectable relative to one another. The first contact includes a body having a first layer and a second layer, wherein the first layer is arranged on the second layer and is configured to come in contact with the second contact for providing the electrical connection with the second contact. The first layer has a first material composition having an Ag content that is higher than an Ag content of a second material composition of the second layer. Further, the first material composition has a WC content that is lower than a WC content of the second material composition.

A low voltage circuit breaker is provided. The low voltage circuit breaker includes a contact system with a first contact and a second contact that are electrically connectable and disconnectable relative to one another. The first contact includes a body having a first layer and a second layer, wherein the first layer is arranged on the second layer and is configured to come in contact with the second contact for providing the electrical connection with the second contact. The first layer has a first material composition having an Ag content that is higher than an Ag content of a second material composition of the second layer. Further, the first material composition has a WC content that is lower than a WC content of the second material composition.

A circuit breaker includes a vacuum interrupter having a closed position and an open position. The circuit breaker includes a linkage operatively coupled to and extending from the vacuum interrupter and a high-speed actuator operatively connected to the linkage. The high-speed actuator is operable to move the linkage by a repulsion force and cause the vacuum interrupter to move to the open position. The circuit breaker includes a decelerator with an integrated latch assembly operatively coupled to the high-speed actuator. The decelerator decelerates the repulsion force of the high-speed actuator and latches the actuator with the integrated latch assembly to maintain the vacuum interrupter in the open position.

A circuit breaker includes a pole unit with a moveable electrode and a fixed electrode. A resilient member is operably connected to a first end of the pole unit. A linkage extends from the second end of the pole unit and operably connects to the moveable electrode. A linear actuator is operably connected to the linkage and located away from the pole unit. A Thomson coil or other high-speed actuator is also operably connected to the linkage. A gap is provided between the pole unit and the linear actuator member when the resilient member is not extended. To open the electrodes, the high-speed actuator first acts on the linkage by pulling the movable electrode away from the fixed electrode. The linear actuator then actuates and increases the distance between the contacts of the breaker by pulling the pole unit toward it, closing the gap.

Automatic transfer switches and methods of forming such switches are disclosed herein. One automatic transfer switch disclosed herein includes a first source bar structured to connect to a first power source, a second source bar structured to connect to a second power source, and a stationary bar structured to be coupled to a load. The automatic transfer switch also includes a first movable bar and a second movable bar each electrically coupled and rotatably connected to the stationary bar. The length of each movable bar and the angle of each movable bar with respect to the stationary bus bar are selected to approximately balance the contact force on each movable bar. Thus, smooth and reliable operations of the automatic transfer switch can be achieved.