Abstract: The electrical contactor (100) according to the invention comprises at least one first switch (104) that includes a first moving contact (112) and several second switches (106) that include a second moving contact (116). The contactor further comprises at least one control device for controlling the movement of the or each first (112), second (116) moving contact, respectively. The control device is capable of controlling the movement of the or each first moving contact (112) into the open position before that of each second moving contact (116) into the open position, and when the or each first moving contact (112) is in the closed position, the second switches (106) are connected in parallel, whereas when the or each first moving contact (112) is in the open position, the second switches (106) are connected in series.

Abstract: An arc extinguishing apparatus for a ring main unit includes: a housing; a plurality of fixed contactor assemblies fixed to be protruded toward the center in the housing and formed by inserting a permanent magnet for arc extinguishing by a magnetic force between a pair of main circuit fixed contacts; a plurality of earthing fixed contactors fixed to be protruded toward the center in the housing and installed to be spaced apart from the fixed contactor assemblies at a predetermined angle; a 3-phases common rotational shaft installed to be rotatable at the center of the housing; and a rotatable movable contactor assembly having a plurality of puffer guide plate sections having openings with a narrow opening width to accelerate the velocity of flow of insulating gas to extinguish arc by blowing it, and rotatable to a circuit closing position, an earthing position, and a circuit opening position.

Abstract: A heavy-duty circuit breaker has a housing with a longitudinal housing axis and a contact arrangement disposed in the housing. The contact arrangement is conductively connected to a first electrical lead fed through the housing and a second electrical lead fed through the housing. The housing comprises a first housing part and a second housing part. The first electrical lead is fed through the first housing part, and the second electrical lead through the second housing part. The two housing parts are connected together so as to be rotatable in opposite directions about the longitudinal housing axis.

Abstract: A high-voltage loadbreak switch operates submersed in a dielectric fluid and may be configured to switch one or more phases of power using one or more phase switches. Each phase switch may include first and second stationary contacts. The first stationary contact may be connected to a phase of a high-voltage power source. Each phase switch also may include a non-stationary contact. The non-stationary contact may be placed in a first position to electrically couple the first stationary contact to the second stationary contact, and in a second position to decouple the first stationary contact and the second stationary contact. The region of motion of the first non-stationary contact between the first position and the second position includes an arcing region. The high-voltage loadbreak switch uses a fluid circulation mechanism to improve circulation of the dielectric fluid through the arcing region.