| 摘要 |
Antitheft device for an electromagnetic actuator system with a coil (3). It comprises a main casing (1), and a plate (2) which contains this coil (3) and a static switch (16) for controlling the latter. The casing (1) and the plate (2) are embedded in the resin and are connected together by a multistrand cable (16 strands, for example), only three strands (10, 11, 12) of which are usable, all the others being open to the air. The casing (1) contains the resistor (14) for protecting the control electrode (20) of the static switch (16). A Zener diode (21), which is connected in series in the control circuit (11, 20) of this switch (16), guarantees that, in the event of severance of the cable (9), an infinite resistance is always found between any two strands of this cable. Furthermore, application of DC voltage (+12 volts, 0 volts) between two of these strands has every chance of destroying this static switch (16). <IMAGE> |
