Abstract: An anti-theft alarm cable, wherein the circuit between a sound generator (1) and a battery (2) is made when an attempt is made to remove a power cable from its permanent location between an electrical appliance and the main supply, characterized in that the sound generator (1) and battery (2) are encapsulated in the rear part of the connector. There is a diaphragm and sound holes in the connector which let sound from the sound unit pass out of the connector. There is a locking device in the front pan of the connector wherein a metal piece presses out of the connector and into the wall of the input terminal to ensure that the connector remains in the input terminal. A transformer can be built into the plug and conduct DC to PCB 2 through two extra conductors in the power cable.

Abstract: Alarm cable II, wherein a siren is triggered when there is a loss of mains voltage, characterized 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 lightning or surge voltage. There may be input terminals for telephone lines which allow pager or mobile phone signalling.