Patent ID: 9653222
Date: 2017-05-16
CPC Classifications: H01H

Claim:
1. A contact device, comprising: a pair of fixed contacts fixedly disposed inside an arc extinguishing chamber to maintain a predetermined interval from each other; a movable contact disposed inside the arc extinguishing chamber, and contacting to and separating from the pair of fixed contacts; a first arc root movement promotion portion formed on each of the pair of fixed contacts, and promoting a movement of a root of an arc in a direction away from the movable contact, the arc being generated when contacts are opened in which the movable contact moves away from the pair of fixed contacts; and a second arc root movement promotion portion formed on the movable contact, and promoting a movement of the root of the arc in a direction away from the fixed contacts, the arc being generated when the contacts are opened in which the movable contact moves away from the pair of fixed contacts, wherein the first arc root movement promotion portion formed in each of the pair of fixed contacts includes arc runners in a form of a plate formed separately from each of the fixed contacts, the plates as the arc runners being two arranged on two side surfaces, opposite to each other, of each of the pair of fixed contacts to sandwich each of the fixed contacts between the two plates, the plates being parallel to an extending direction of the movable contact and a direction of current flow in each of the pair of fixed contacts, and protruding to a direction opposite to the movable contact beyond each of the pair of fixed contact.