A shape-memory alloy actuated switch (SMAAS) is provided that enables the stable switching of two separate circuits. The presently disclosed SMAAS includes a substrate, one or more electrical contacts attached to the substrate for connecting to load circuits, and one or more electrically conductive elements for selectively connecting the one or more electrical contacts. The disclosed SMAAS also includes one or more shape-memory alloy actuators attached to the substrate. The one or more shape-memory alloy actuators are configured to move the one or more electrically conductive elements. The shape-memory alloy actuators are self-heated by passing current through the shape-memory alloy material. The disclosed SMAAS may also include electrical contacts to connect an external control current to the shape-memory alloy material. In some examples, the provided SMAAS includes one or more retention mechanisms to prevent movement of the electrically conductive elements after actuation.

The application relates to a spring mechanism for a dual power transfer switch and a dual power transfer switch. The spring mechanism includes: a base mounted on a housing of the dual power transfer switch; and a spring mounted on the base. The spring includes a first leg configured to contact and exert a pressure on an indicator of the dual power transfer switch, so as to generate a frictional force between the first leg and the indicator and reduce a rebound of the indicator upon the indicator moving between a first indicating position and an intermediate indicating position, the first indicating position indicates that the dual power transfer switch is in a first power-on position, and the intermediate indicating position indicates that the dual power transfer switch is in a dual-off position.

The application relates to a spring mechanism for a dual power transfer switch and a dual power transfer switch. The spring mechanism includes: a base mounted on a housing of the dual power transfer switch; and a spring mounted on the base. The spring includes a first leg configured to contact and exert a pressure on an indicator of the dual power transfer switch, so as to generate a frictional force between the first leg and the indicator and reduce a rebound of the indicator upon the indicator moving between a first indicating position and an intermediate indicating position, the first indicating position indicates that the dual power transfer switch is in a first power-on position, and the intermediate indicating position indicates that the dual power transfer switch is in a dual-off position.

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.

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.

The present utility model discloses an adjustable contactor including: a static contact fixed in the contactor; a movable contact which is connected in the movable contact bracket through a contact spring, and which makes contact with the static contact in accordance with the movement of the movable contact bracket in the contactor; the contactor further includes adjusting knobs provided in the movable contact bracket at one end in connection with the contact spring while corresponding to the contact springs connected with individual movable contacts, the adjusting knob being set so that adjustment of the compression or release of the contact spring is achieved by rotating the adjusting knob so as to adjust the contact pressure of the movable contact.

The present utility model discloses an adjustable contactor including: a static contact fixed in the contactor; a movable contact which is connected in the movable contact bracket through a contact spring, and which makes contact with the static contact in accordance with the movement of the movable contact bracket in the contactor; the contactor further includes adjusting knobs provided in the movable contact bracket at one end in connection with the contact spring while corresponding to the contact springs connected with individual movable contacts, the adjusting knob being set so that adjustment of the compression or release of the contact spring is achieved by rotating the adjusting knob so as to adjust the contact pressure of the movable contact.

A balance spring assembly for a disconnector comprises a push rod partially and coaxially arranged in a blade of the disconnector which is rotatable about a first shaft to change an operation status of the disconnector, a first end of the push rod fixed to a second shaft so that the push rod is rotatable about the second shaft; and a spring arranged in the blade and around the push rod, the spring held between a second end of the push rod and an end of the blade adjacent to the first shaft, wherein the second shaft is arranged parallel to the first shaft to enable the push rod to axially move in the blade with a rotation of the blade to thereby compress or decompress the spring. By arranging the balance spring assembly at least in part in the blade of the disconnector, only one set of the springs is needed.

A balance spring assembly for a disconnector comprises a push rod partially and coaxially arranged in a blade of the disconnector which is rotatable about a first shaft to change an operation status of the disconnector, a first end of the push rod fixed to a second shaft so that the push rod is rotatable about the second shaft; and a spring arranged in the blade and around the push rod, the spring held between a second end of the push rod and an end of the blade adjacent to the first shaft, wherein the second shaft is arranged parallel to the first shaft to enable the push rod to axially move in the blade with a rotation of the blade to thereby compress or decompress the spring. By arranging the balance spring assembly at least in part in the blade of the disconnector, only one set of the springs is needed.