(57) A current switch arrangement for an electromechanical locking unit, which locking
unit includes a cylinder lock mechanism (1) operated mechanically by a key (2), blocking
means (4) functionally dependent on an electronic code associated with the key (2),
and an electronic control unit (5) which, on the basis of said electronic code, is
arranged to control the blocking means (4) and which, under the control of the current
switch arrangement, is connectable to an electric power source (17). The arrangement
comprises permanent magnet means (11a, 11b) to be attached in association with the
cylinder lock (1), a so called reed switch (10) or the like located in the immediate
vicinity of the permanent magnet means (lla, llb) within the magnetic field provided
thereby and a piece (12) of ferromagnetic material located in the key shank (2a) and
arranged to be positioned in the vicinity of the permanent magnet means (11a, 11b)
when the key (2) is inserted into the cylinder lock (1) so that it causes a change
in the magnetic field activating the reed switch (10) or the like to provide a control
pulse which connects the electronic control unit (5) to the power source (17).
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