| 摘要 |
<p>An actuator device (1) for emergency controls (2), being of a type adapted to act on a sectioning switch (20) connected in a power supply circuit (4) to an electric load (RL), so as to cut off the power supply to the load on the occurrence of an emergency or potentially dangerous situation, comprises: a bistable trip-off means (3) coupled mechanically to the sectioning switch (20) and provided with a trip-off linkage (5) and respective reset key (6); an actuating relay (9) whose plunger (10) is arranged to interfere with the linkage (5) and act upon it to change the state of the trip-off means (3); a back-up battery (14) connected to the relay (9) to keep it constantly alive; an electronic circuit (15) for re-charging said battery (14); and a means (19) of connecting at least one, normally closed, emergency control (2) between the battery (14) and the relay (9).</p> |
