2CKA006400A0090

3 wire connection (neutral conductor required). For the extension of the Busch-Comfort switch or 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 control element 6815-to-101. For Busch-Presence detector sensors 6813- to -102. 6440/05 U