| 摘要 |
<p>Alarm cable II, wherein a siren is triggered when there is a loss of mains voltage, characterised in that a switch function (SW) in the connector (3) also registers that the alarm is not disconnected from the appliance that is to be secured. In the connector (3) there is also a fastening device (14, 15) which is connected to a circuit (8) which registers whether the fastener is released, and then triggers the alarm. In the plug (2) to the mains supply there is a microswitch (SW) which makes it possible to distinguish between attempted theft and regular power failure. A varistor and a gas discharger connected in parallel relation across the mains phase protect against lightening or surge voltage. There may be input terminals for telephone lines which allow pager or mobile phone signalling.</p> |
