The auxiliary power supply K12G is used to assist the Central unit when it powers installations with high consumption in 15 V , like those that have many Control units with intercom. If there are 2 Central units or E17G or E18G amplifiers in the installation, it probably will not be necessary to install power supplies. The power supply K12G/IN is used in no-music installations with Intercom units J12U. In this case, no Central unit is required.
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