A fusible disconnect switch devices includes dual sets of switch contacts to connect or disconnect a current path through an overcurrent protection fuse with reduced arcing severity. Faster acting and longer contact path switch mechanisms are described providing satisfactory switching of DC circuits without excessive electrical arcing in a reduced physical package size.

A key assembly to be installed on a keyboard is provided. The key assembly includes a base plate including a snap-fit hook, a scissor member including a pivot shaft, and a keycap. The keycap is disposed on the scissor member and connected thereto. The scissor member is disposed on the base plate and connected thereto. A bending portion of the snap-fit hook has a chamfer structure to which the pivot shaft is pivotally connected in such a manner that the vertical gap between the snap-fit hook and the pivot shaft is reduced.

A trippable control system for one or more electrical breaker poles, comprises a first link pivotable about a first pivot point between first and second positions; a second link pivotable about a pivot axis for connecting to one or more breaker poles, whereby movement of the first link causes the second link to pivot about the pivot axis between a position for opening and a position for closing the breaker pole(s); and a trip mechanism suitable for releasing the first pivot point and for exerting a movement force on the first link to move the first link between the second and third positions when the first link pivots about a second pivot point. Movement of the first link between the second and third positions causes the second link to pivot about the pivot axis between the position for closing the breaker pole(s) and the position for opening the breaker gear.

A trippable control system for one or more electrical breaker poles, comprises a first link pivotable about a first pivot point between first and second positions; a second link pivotable about a pivot axis for connecting to one or more breaker poles, whereby movement of the first link causes the second link to pivot about the pivot axis between a position for opening and a position for closing the breaker pole(s); and a trip mechanism suitable for releasing the first pivot point and for exerting a movement force on the first link to move the first link between the second and third positions when the first link pivots about a second pivot point. Movement of the first link between the second and third positions causes the second link to pivot about the pivot axis between the position for closing the breaker pole(s) and the position for opening the breaker gear.

A switch includes a housing, a movable member reciprocable in the movement direction relative to the housing and including an operation part located at an end of the movable member outside the housing, a guide that guides the movable member in the movement direction, and a sealant sealing a gap between the movable member and the housing inside the compartment.

A switch includes a housing, a movable member reciprocable in the movement direction relative to the housing and including an operation part located at an end of the movable member outside the housing, a guide that guides the movable member in the movement direction, and a sealant sealing a gap between the movable member and the housing inside the compartment.

A change-over switch includes a swing member configured to swing in response to an operation from the outside, a contact member configured to swing about the swing axis identical to the axis of the swing member and including a plurality of movable contacts extending in different directions, and a substrate on which a fixed contact is formed, the fixed contact configured to contact the plurality of movable contacts of the contact member. In the change-over switch, the movable contact that contacts the fixed contact formed on the substrate is changed over by swinging of the contact member in conjunction with swinging of the swing member. A switch device includes a power source switch configured to open and close a circuit which supplies electric power to a power load, and a change-over switch configured to change over electric power supplied to the power load.

A change-over switch includes a swing member configured to swing in response to an operation from the outside, a contact member configured to swing about the swing axis identical to the axis of the swing member and including a plurality of movable contacts extending in different directions, and a substrate on which a fixed contact is formed, the fixed contact configured to contact the plurality of movable contacts of the contact member. In the change-over switch, the movable contact that contacts the fixed contact formed on the substrate is changed over by swinging of the contact member in conjunction with swinging of the swing member. A switch device includes a power source switch configured to open and close a circuit which supplies electric power to a power load, and a change-over switch configured to change over electric power supplied to the power load.

A seesaw type operation unit having a new configuration is provided. A swinging member is capable of swinging in a predetermined direction with a rotation axis at a center. An urging member urges the swinging member to a neutral position. A detector includes a rotating portion which is arranged coaxially with the rotation axis and rotates integrally with the swinging member, and outputs a signal depending on a rotation amount of the rotating portion. An operating member receives an operation from an outside and causes the swinging member to rotate in the predetermined direction by the operation. A supporting member rotatably and coaxially supports the swinging member and the operating member. In a case where the operating member is rotated in the predetermined direction, the operating member pushes an end of the swinging member to rotate the operating member, the swinging member, and the rotating portion integrally with one another.

A seesaw type operation unit having a new configuration is provided. A swinging member is capable of swinging in a predetermined direction with a rotation axis at a center. An urging member urges the swinging member to a neutral position. A detector includes a rotating portion which is arranged coaxially with the rotation axis and rotates integrally with the swinging member, and outputs a signal depending on a rotation amount of the rotating portion. An operating member receives an operation from an outside and causes the swinging member to rotate in the predetermined direction by the operation. A supporting member rotatably and coaxially supports the swinging member and the operating member. In a case where the operating member is rotated in the predetermined direction, the operating member pushes an end of the swinging member to rotate the operating member, the swinging member, and the rotating portion integrally with one another.