A relay contactor is provided and includes a shaft assembly comprising a plate, which is movable between an open position at which the plate is displaced from leads and a closed position at which the plate contacts the leads and an actuation system configured to selectively move the plate into the closed position. At least one of the shaft assembly and the actuation system is configured such that, as the plate moves into and away from the closed position, a movement of the plate relative to the leads comprises at least a non-linear, rotational or an abnormally linear component.

A vacuum interrupter module for a tap changer includes an insulation plate having a first main side and a second main side opposite of the first main side, a vacuum interrupter assembly, a bypass switch assembly, and a control cam. The vacuum interrupter assembly includes a vacuum interrupter and a driving mechanism coupled with the vacuum interrupter, the vacuum interrupter and the driving mechanism being arranged on the first main side of the insulation plate. The bypass switch assembly includes two bypass contacts, each one mechanically connected to a corresponding bypass lever, the two bypass contacts and the two corresponding bypass levers being arranged on the first main side of the insulation plate. The control cam is arranged on the first main side of the insulation plate and configured to actuate both the driving mechanism and, through the corresponding bypass levers, the two bypass contacts.

A valve controller includes a housing defining an interior volume, and a transmission assembly at least partially disposed in the interior volume of the housing. The transmission assembly includes a shaft coupled to a cam sub-assembly, which includes a first side and a second side opposite the first side, a first cam, and a second cam coupled to the first cam. Each of the first and second cams includes a bore arranged to receive the shaft and a lobe. The lobe of the first cam and the lobe of the second cam being at least partially coplanar. A first switch and a second switch are disposed in the interior volume of the housing and adjacent to the transmission assembly. The lobe of the first cam is arranged to activate the first switch and the lobe of the second cam is arranged to activate the second switch.

A valve controller includes a housing defining an interior volume, and a transmission assembly at least partially disposed in the interior volume of the housing. The transmission assembly includes a shaft coupled to a cam sub-assembly, which includes a first side and a second side opposite the first side, a first cam, and a second cam coupled to the first cam. Each of the first and second cams includes a bore arranged to receive the shaft and a lobe. The lobe of the first cam and the lobe of the second cam being at least partially coplanar. A first switch and a second switch are disposed in the interior volume of the housing and adjacent to the transmission assembly. The lobe of the first cam is arranged to activate the first switch and the lobe of the second cam is arranged to activate the second switch.

The shell is provided with an axial opening at the top and a guide track structure inside. The movable terminal is provided inside the shell and forms an arm spring. The actuating lever is threaded through the axial opening, with a flat slope on one side and a positioning slope on the other. The actuating lever is provided with a guiding structure, and the positioning slope is provided with a positioning structure. Moving upwards along the circumference, the actuating lever has a position 1 and a position 2. When the actuating lever is at position 1 or position 2, the guiding structure joins the guide track structure. When the actuating lever is at position 1, the arm spring comes into contact with the flat slope and slips. When the actuating lever is at position 2, the arm spring comes into contact with the positioning slope and slips.

A limit switch operating head includes a shaft rotatable in clockwise and counter-clockwise directions, a cam member supported on the shaft and that is rotatable in the clockwise and counter-clockwise directions responsive to rotation of the shaft, and a follower actuated by the cam member responsive to rotation thereof, with the follower including a pivot pin, a lever portion pivotable about the pivot pin, and a rolling pin mounted to the lever portion and in contact with the cam member. An actuator member contacts the lever portion and translates linearly in a first direction or second direction responsive to pivoting thereof. The rolling pin moves along a profile of the cam member upon rotation of the cam member so as to cause the lever portion to pivot, with the actuator member linearly translating in the first direction or the second direction responsive to the pivoting of the lever portion.

A limit switch operating head includes a shaft rotatable in clockwise and counter-clockwise directions, a cam member supported on the shaft and that is rotatable in the clockwise and counter-clockwise directions responsive to rotation of the shaft, and a follower actuated by the cam member responsive to rotation thereof, with the follower including a pivot pin, a lever portion pivotable about the pivot pin, and a rolling pin mounted to the lever portion and in contact with the cam member. An actuator member contacts the lever portion and translates linearly in a first direction or second direction responsive to pivoting thereof. The rolling pin moves along a profile of the cam member upon rotation of the cam member so as to cause the lever portion to pivot, with the actuator member linearly translating in the first direction or the second direction responsive to the pivoting of the lever portion.

A limit switch includes: a switch main body; and an operation unit connected to the switch main body. The operation unit includes: a housing; a shaft member, a biasing member; and a plunger. The shaft member includes a shaft body supported by the housing in a manner rotatable from a return position to an operation position around a rotation axis, and a cam. The plunger includes: a plunger body; and at least one contact portion. The at least one contact portion includes a recess positioned on a facing surface facing the at least one protrusion and recessed in a direction moving closer to the switch main body. The recess includes: a first end; a second end; and an inclined surface. The inclined surface is inclined in a direction moving closer to the switch main body as the inclined surface extends from the second end to the first end.

An isolating switch for a circuit includes: a switching mechanism movable between an open position in which the circuit is open and a closed position in which the circuit is closed; and a housing. The housing includes: a first housing component coupled to and enclosing the switching mechanism; a second housing component coupled to the switching mechanism and movable with respect to the first housing component to move the switching mechanism between the open position and the closed position; at least one aperture arranged in one of the first or second housing components; and at least one test point electrically connected to the circuit and arranged in an other of the first or second housing components. The second housing component is movable with respect to the first housing component between at least: a first relative position in which the switching mechanism is in the closed position.

An operating mechanism for opening and closing at least two contacts simultaneously is provided. The operating mechanism includes a base frame and a bridge body having an elongate contact surface with a length and a width. The elongate contact surface is configured to extend in a length direction over and be in contact with operating rods of the at least two contacts. The operating mechanism further includes a first reaction arm extending substantially parallel to the length of the elongate contact surface and a second reaction arm extending parallel to the first reaction arm and at a distance of the first reaction arm in the direction perpendicular to the elongate contact surface. The operating mechanism also includes a rod mechanism of two links and a cam arranged on a shaft.