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.

The invention relates to a highly dynamic electromagnetic drive in the manner of a Thomson coil with soft-magnetic frame, comprising a first excitation coil (30) whose winding height is greater than its length, which hence is flat; a soft-magnetic frame (10) in which the first excitation coil (30) is arranged and against which it abuts, and which in in the manner of a pot magnet constitutes an open magnetic circuit which includes an outer region (11), a bottom (12) and an inner region (13), and which is open on its end face, wherein the first excitation coil at least partly encloses the inner part (13) of the frame; a short circuit armature (40) preferably formed hollow cylindrical at least on its side facing the first excitation coil (30), which is movably mounted along an axis and which in its stroke starting position dips into the end-face opening of the frame (10) and thereby at least partly encloses the inner part of the frame (13), wherein the frame (10) entirely or predominantly is formed of a soft-magnetic composite material or one or more sheet stacks, which has a saturation flux density of at least 1.5 T and an effective specific electrical conductivity of not more than 10.sup.6 S/m, and the first excitation coil (30) and/or the frame (10) include at least one means for strain relief, in particular in the form of an enclosure in order to at least partly absorb at least the radial forces occurring on the first excitation coil (30) during an actuating operation vertically to the direction of movement, and wherein the Lorentz force acting on the short circuit armature is used to perform work.

The invention relates to an electric motor-operated on-load tap changer (1) comprising an emergency drive. An electric motor (3) and a power store (13) of said on-load tap changer (1) are mechanically coupled by means of a gear (5) that is provided with a gear housing (90). The gear (5) comprises a gear shaft (61) on which a toothing (55) is designed. For manual emergency operation, the claimed gear shaft (61) has an extension (62) which comprises a free end (65) for attaching a tool (95). The invention also relates to a method for adjusting a defined switching position of an on-load tap changer (1) when in an emergency operation mode.

The invention relates to an electric motor-operated on-load tap changer (1) comprising an emergency drive. An electric motor (3) and a power store (13) of said on-load tap changer (1) are mechanically coupled by means of a gear (5) that is provided with a gear housing (90). The gear (5) comprises a gear shaft (61) on which a toothing (55) is designed. For manual emergency operation, the claimed gear shaft (61) has an extension (62) which comprises a free end (65) for attaching a tool (95). The invention also relates to a method for adjusting a defined switching position of an on-load tap changer (1) when in an emergency operation mode.

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 transmission subsystem has an automatic transfer switch (100) which includes at least a pair of movable contact members (28, 30). The pair of movable contact members includes a first movable contact member (28) at a first location and a second movable contact member (30) at a second location. The automatic transfer switch further includes a fixed member (29), a controller (68) configured to select one of the first and second movable contact members, and a permanent magnetic actuator (65). The permanent magnetic actuator includes an actuator body, a first driving rod (60), and a second driving rod (62). The permanent magnet actuator is configured to move the first driving rod in a first direction independently of movement of the second driving rod. The first driving rod is configured to move the first movable contact member, and the second driving rod is configured to move the second movable contact member.

A transmission subsystem has an automatic transfer switch (100) which includes at least a pair of movable contact members (28, 30). The pair of movable contact members includes a first movable contact member (28) at a first location and a second movable contact member (30) at a second location. The automatic transfer switch further includes a fixed member (29), a controller (68) configured to select one of the first and second movable contact members, and a permanent magnetic actuator (65). The permanent magnetic actuator includes an actuator body, a first driving rod (60), and a second driving rod (62). The permanent magnet actuator is configured to move the first driving rod in a first direction independently of movement of the second driving rod. The first driving rod is configured to move the first movable contact member, and the second driving rod is configured to move the second movable contact member.

A device for supplying electric power includes a rectifier, an adaptive voltage clamping circuit, and a DC-DC voltage regulator. The rectifier receives electrical power, and is electrically connected to an input line of the adaptive voltage clamping circuit. The adaptive voltage clamping circuit includes a power transistor, a voltage feedback circuit, and a controller. The DC-DC voltage regulator is electrically connected to the adaptive voltage clamping circuit and, in one embodiment an actuator. The controller monitors the voltage feedback circuit and controls the power transistor to a fully open state to transfer electric power to the DC-DC voltage regulator when the voltage level supplied to the DC-DC voltage regulator is less than a threshold. The controller controls the power transistor in a linear state to regulate the voltage transferred to the DC-DC voltage regulator when the voltage level supplied to the DC-DC voltage regulator is greater than the threshold.

A device for supplying electric power includes a rectifier, an adaptive voltage clamping circuit, and a DC-DC voltage regulator. The rectifier receives electrical power, and is electrically connected to an input line of the adaptive voltage clamping circuit. The adaptive voltage clamping circuit includes a power transistor, a voltage feedback circuit, and a controller. The DC-DC voltage regulator is electrically connected to the adaptive voltage clamping circuit and, in one embodiment an actuator. The controller monitors the voltage feedback circuit and controls the power transistor to a fully open state to transfer electric power to the DC-DC voltage regulator when the voltage level supplied to the DC-DC voltage regulator is less than a threshold. The controller controls the power transistor in a linear state to regulate the voltage transferred to the DC-DC voltage regulator when the voltage level supplied to the DC-DC voltage regulator is greater than the threshold.