A contact device includes: a first fixed terminal; a movable contact that comes into contact with and away from the first fixed terminal by moving relative to the first fixed terminal; and a drive unit that moves the movable contact. The movable contact includes a movable contact main body having a first contact unit that comes into contact with the first fixed terminal. The first contact unit includes a plurality of first contact pieces that come into contact with the first fixed terminal.

An electromagnetic relay includes a base having a receiving space, an electromagnetic unit disposed outside of the receiving space, a magnetically attractive member magnetically attractable by the electromagnet unit, a first stationary contact disposed in the receiving space, a second stationary contact, a movable terminal member and a movable contact. When the electromagnetic unit is energized, the movable terminal member is pushed by the magnetically attractive member and the movable contact contacts one of the first and second stationary contacts. When the electromagnetic unit is de-energized, the movable contact contacts the other one of the first and second stationary contacts.

An overheating destructive switch, comprising: a first conductive element, a second conductive element, a movable conductive element, an overheating destructive element, an operating component, and a second elastic element. The movable conductive element connects the first conductive element and the second conductive element. A first elastic element and the second elastic element act on an operating element. The first elastic element is compressed and has a first elastic force, and the second elastic element has a second elastic force. The first elastic force is greater than the second elastic force under in a normal state. When the overheating destructive element is destroyed due to overheating, the first elastic force is reduced or lost, such that the second elastic force becomes greater than the first elastic force. The movable conductive element is consequently disconnected from the first conductive element and the second conductive element, thus achieving protection against overheating.

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 plasma generator and a method for setting an ion ratio. In an embodiment a plasma generator includes a piezoelectric transformer suitable for ionizing a process gas, an ion separation electrode and a drive circuit suitable for applying a potential to the ion separation electrode.

A solid dielectric deadfront electrical switch assembly having a switch contact assembly. The switch contact assembly can include an upper insulative diaphragm, a male pin contact having an insulating tip and an isolating sleeve, a primary contact, a lower insulative diaphragm, and a female socket contact. The upper insulative diaphragm, isolating sleeve, and insulating tip can assist in electrically isolating the male contact pin when the electrical switch assembly is in an open condition. Further, the upper insulative diaphragm can be separated from the female socket contact, and/or a female-contact insulating sleeve, by a gap chamber that utilizes air as an insulator. The lower insulative diaphragm can be configured to engage a drive rod that is used to axially displace the male pin contact between open and closed positions in a manner that may prevent arcing between the switch contact assembly and a base plate of a switchgear.

A solid dielectric deadfront electrical switch assembly having a switch contact assembly. The switch contact assembly can include an upper insulative diaphragm, a male pin contact having an insulating tip and an isolating sleeve, a primary contact, a lower insulative diaphragm, and a female socket contact. The upper insulative diaphragm, isolating sleeve, and insulating tip can assist in electrically isolating the male contact pin when the electrical switch assembly is in an open condition. Further, the upper insulative diaphragm can be separated from the female socket contact, and/or a female-contact insulating sleeve, by a gap chamber that utilizes air as an insulator. The lower insulative diaphragm can be configured to engage a drive rod that is used to axially displace the male pin contact between open and closed positions in a manner that may prevent arcing between the switch contact assembly and a base plate of a switchgear.

A method for controlling a target switch assembly in a chain of switch assemblies includes distributing the chain of switch assemblies in a wellbore; placing a controller at a head of the wellbore; making a first decision, at the controller, to actuate a corresponding detonator of the target switch assembly; transmitting, from the controller to the target switch assembly, a fire command to activate the corresponding detonator; and making a second decision, locally, at the target switch assembly, to activate the detonator, after the fire command from the controller is received.

A button switch includes a base having a pillar, a cover disposed on the base, a sleeve, an arm adjacent to the pillar and an elastic member having upward-force-applying, extending-rod, and flexible-rod portions. The sleeve jackets the pillar, passes through the cover, and has first and second ribs. The upward-force-applying portion jackets the pillar and abuts against the sleeve and the base to drive the sleeve to move away from the base. The extending-rod portion extends from the upward-force-applying portion to be connected to the flexible-rod portion located under the first rib. When the sleeve is located at a high position, the second rib biases the arm to deform. When the sleeve is located at a low position, the second rib is misaligned with the arm. The flexible-rod portion crosses the first rib to be released and then collides with the cover to make sound as the sleeve is pressed.