Door closure, in particular a shaft door of a machine or of a lift, wherein the door closing a housing and comprises a latch with respect to the door in a locking position and into a released position and is supported in the housing, whereby the closure of a manually operable emergency unlocking for the transfer of the locking bar into its release position, wherein the emergency unlocking device has a driver, with the transfer of the locking bar into the release position by means of an emergency unlocking key is actuated, characterised in that, on or in the housing (1) a safety switch (19, 33) with with positive opening operation properties or at least a part of a which can be used instead of such a safety switch electrical safety circuit in each case for the interruption of a normal operation of the machine or of the elevator and / or for the resumption of an interrupted normal operation of machine or elevator is provided, that a this / is assigned to the said carrier (11) for the actuation of the safety switch (19, 33) and the safety circuit is provided, of the of the driver (11) of the emergency unlocking different or, with this..
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