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Speech Cut Off Device and tone generator for use on 4+ 1 systems with privacy of speech and lock release (one required per system). It enables speech and operation of lock to be carried out only from the last telephone called.
View moreThe 509N temporarily switches off the system, disabling all intercoms then to send out the call tone which will enable only the called intercom. In a standard 5 modules A type DIN box (87,5 mm). Can be fixed to either a DIN bar or directly to the wall using two expansion type screws.
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