| 摘要 |
An electric circuit formation is configured in such a way that a plurality of contact components (11), which are neighbored each other and can be contacted or separated, are arranged between a first fixed electrode (4) and a movable electrode (10), and between a second fixed electrode (5) and the movable electrode (10) so as to configure a usual electric circuit, and a current-limiting resistor (15) is connected to the usual electric circuit in parallel so as to configure a current-limiting electric circuit. Contact-separation components (12) including engagement protrusions (12a), which can be fitted to concave engagement portions (11a) provided at side surfaces of each of the contact components (11), are arranged at both sides of the contact components (11). The contact-separation components (12) are driven by a contact driving unit so as to be shifted between an insertion position, at which the neighboring contact components (11) are separated each other, and the opposite extraction position. Even when the contact-separation components (12) are shifted to the extraction position, the engagement protrusions (12a) are contacted to the concave engagement portions (11a) of all contact components (11) which are shifted to the insertion position so as to be separated. |
