| 摘要 |
<p>The invention relates to a spring operated actuator for an electrical switching apparatus. The actuator has a main shaft (1) transmitting the actuation movement to the switching apparatus and has opening spring means and closing spring means. According to the invention the opening spring means includes an opening torsion spring (3) and the closing means includes a closing torsion spring (4). The axes of the torsion springs (3, 4) extend in the same direction and at a distance from each other that is less than 20 % of the external opening spring diameter.</p> |
