| 摘要 |
<p>PURPOSE:To protect electronic equipment connected in parallel from interference from counter electromotive force by maintaining the counter electromotive force by a permanent magnet at zero with a movable iron core kept at a specified position during manual operation or by installing diodes in a circuit. CONSTITUTION:Provision is made so that a link 11 is not held by a cross bar 14 when a contact 3 is closed by manually moving the cross bar 14 with its protrusion held 14a by hand. A movable iron core 6 stays in the same position as when the contact 3 is freed. Thus, the position of the movable iron core 6 remains unchanged relative to a permanent magnet 9, and no counter electromotive force is generated by the permanent magnet 9 when the contact 3 is freed manually, thereby keeping electronic equipment connected in parallel free from interference from counter electromotive force. Also, installing diodes D1, D2, D3 in positions shown in a circuit in which electronic equipment RA2 is connected in parallel to a relay with an electromagnetic coil RA1 and a permanent magnet PM minimizes counter electromotive force if ever present, protecting the electronic equipment against interference from counter electromotive force.</p> |
