Mitsubishi Denki Kabushiki Kaisha

Shigeru Masuda

Teijiro Mori

Masahiro Kakizoe

Shizutaka Nishizako

Yuichi Wada

Hiroyuki Okado

Yuji Sako

Tatsuya Hayashi

Shigeharu Otsuka

Hiroaki Tazawa

Shigeharu Ohtsuka

Harumi Hiraki

Tokio Tateishi

Syunichi Sutoh

Shizutaka Nishisako

A switch which is superior in current limiting performance. The switch comprises a movable contact element having a pair of movable contacts secured thereto, a pair of fixed contacts individually secured to fixed contact elements for individually contacting with the movable contacts, an electromagnetic driving device including a movable iron core, and a first operating rod secured to the movable iron core. An electromagnet is disposed alongside the electromagnetic driving device and includes a movable iron core, and movement of the movable iron core of the electromagnet is transmitted to the movable contact element by way of a transmitting member and a second operating rod. The first and second operating rods are disposed for movement along a common axial line, and movement of the movable iron core of the electromagnetic driving device is transmitted from the first operating rod to the movable contact element either directly or by way of the second operating rod.

Switch

A switch for as an electromagnetic contactor, a circuit breaker for wiring, an air circuit breaker and so on is provided. The switch comprises a fixed contact 8A joined to a fixed contactor 8, an movable contact 6A joined to a movable contactor 6 to face the fixed contact, a plurality of arc extinguishing metallic plates 13 arranged with predetermined distances and in parallel to the fixed contactor 8 at the side of the end portion of the movable contactor 6 and a commutation plate 15 placed at the opposite side of the fixed contactor so as to interpose the movable contactor. In the switch, an end of the arc extinguishing metallic plates 13 is extended toward the movable contactor 6, and the end of the extended portion is cut to form leg portions 13fa, 13ga which allows the movement of the movable contact 6A, and it is moved to contact with the fixed contact 8A, whereby an arc produced between the movable contact 6A and the fixed contact 8A is rapidly attracted to the arc extinguishing metallic plates to allow interruption of a large electric current.

Power switch

An electromagnetic contactor in which at least one pair of contacts which disengage from each other to interrupt a current are provided in an arc-extinguishing chamber defined by a partition wall of electrically insulating material. An absorbing member of porous metal is provided on the inner surface of the partition wall to absorb molten metal particles which are formed by arcing at the time of disengagement of the contacts. A shield plate of electrically insulating material is provided on the inner surface of the absorbing member, and through-holes are formed in the partition wall of the arc-extinguishing chamber and the shield plates in such a manner that the through-holes of the partition wall are non coincident in position with those of the shield plate so that the absorbing member is protected from damage.

Electromagnetic contactor

An electromagnetic contactor in which an arc extinguishing chamber is defined by an insulating base and a box attached removably to the insulating base. In the arc extinguish chamber, there are accommodated fixed contact elements having fixed contacts, a movable contact element having a movable contact adapted to be brought into and out of contact with the fixed contacts of the fixed contact elements, a commutation electrode for receiving arcs established when the movable contact comes out of contact with the fixed contacts, arc extinguish metal plates for extinguishing arcs commutated to the commutation electrode, and an extinguishing plate support for supporting the arc extinguishing plates. The extinguishing plate support is formed with a groove or hole for receiving the end portion of the commutation plate so that it is held on the commutation electrode. By elastically clamping the commutation electrode between the inner wall faces of the box defining the arc extinguishing chamber, the extinguishing plate support is held in the arc extinguishing chamber by the commutation electrode.

A switch for making and breaking an electric current and having an arc-extinguishing mechanism. Said switch includes a fixed contact plate having a fixed contact thereon, a movable contact plate having a fixed contact adapted for movement to come into and go out of said fixed contact and an arc deflecting plate provided substantially parallel to said movement. Said arc deflecting plate is made of magnetic metal and is formed with a U-shaped portion in proximity to said fixed contact plate.

In an electric power switch in which an arc generated between movable and stationary contacts 6, 14 migrates to an arc runner 15 and a commutation end plate and is extinguished by a grid 2 arranged therebetween, a cut is formed at least in the lower half of the end plate which confronts the grid, whereby the end of the arc is driven towards the center of the end plate and away from a surrounding arc box 1.

Electric power switch with slotted commutation end plate

An electromagnetic contactor comprises a stationary contact point fixed to a stationary contact, a movable contact point fixed to a movable contact to associate with the stationary contact point for switching operations, an arc box for arc extinction for receiving the stationary and movable contacts, a commutation plate fixed to the arc box to commutate arc produced between the stationary and movable contacts and grids placed adjacent to the commutation plate and each having fitting pawls to be inserted into slits formed in the arc box, the top end of said fitting pawls being bent at the portion projecting from the slit to fix the grid to the arc box. The shortest distance X between the commutation plate and the stationary contact and the shortest distance Y between the grid and the stationary contact have relation of X.ltoreq.Y.

A power switching device including a fixed contact, a movable contact, an arc runner for transferring a leg of an electric arc to the outside of the fixed contact, a U-shaped fixed contactor electrically connected to the fixed contact, and a deionizing grid for extinguishing the arc. The side of the fixed contact is opposed to the side of the arc runner in three directions. At least the portion of the arc runner close to the fixed contact is kept away from the fixed contact and is physically separated therefrom by an electrically insulating medium. The arc runner is fixed and connected to a portion of the fixed contactor which is on the opposite side of the deionizing grid with respect to the fixed contact. Further, the runner extends so that it forms a continuous path along which the arc runs. Accordingly, after the arc has been transferred to the runner, it is urged toward the deionizing grid, thereby assuring continuous and smooth movement of the arc. Thus, a situation in which the arc is moved away from the grid resulting in incomplete extinction of the arc is prevented.

Power switching device

A power switchgear is equipped with a stationary contact and contact-maker, a movable contact and contact-maker, a commutating electrode and an arc runner. The elements are constructed and arranged such that when the contacts open, the resultant arc will be quickly driven from the contacts to the commutating electrode and arc runner, to increase the life of the contacts and shorten the arcing time.

Growing community of inventors

Nagoya, Japan

Shigeru Masuda