Switching module for intercom networks, for use in video door entry systems with 6680 power supply unit (and audio door entry systems with power supply units 0931, 931A and 0931/0CT), can be used to create independent groups of intercommunicating monitors and interphones, has a differentiated call generator, connection of several 935A devices requires one 0832/030 transformer for each switching module, installation on DIN rail (60715 TH35), occupies 4 modules size 17.5 mm
