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3-wire connection technology (neutral conductor required). For expansion of Busch-Comfort switch® or Busch-Presence detector installations. For communication with universal relay insert 6440/01 U. For communication with universal e-contact insert 6440/04 U. For Busch-Comfort switch® operating element 6815-...-101. For Busch-Presence detector sensors 6813-¿-102. Only in conjunction with commercially available flush-mounted device boxes according to DIN 49073, mount or Busch-Jaeger art. no. 3040 flush-mounted box masonry, 3050 flush-mounted box hollow wall or 3060 flush-mounted box concrete)
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