Arrangement for separating a control device from an AC mains supply

Abstract

The invention relates to an arrangement for isolating control devices from the mains in cases where the internal operating voltage is supplied by means of a mains-bound voltage source. Control devices of this kind, which are used in many fields of engineering, including applications in living rooms and bedrooms, are always connected to mains voltage, this entailing disadvantages in terms of costs, a hazard potential and concerns as regards health. The task of the invention, which consists in isolation from the mains during times at which no control functions are to be performed, is solved by providing a relay (12) with at least one relay-actuated switch which is in the OFF position when not excited and is located in the mains-side supply lead (11) and by providing an auxiliary power source (9, 10) which is wired in parallel with the mains-bound voltage source (7, 8) and is connected to the control input of the relay (12) via a switch (3 to 6). (FIG.)

Dependencies are inferred from the claim text.