ABB Busch-Dimmer 6593 U-500 Manual Del Usuario página 45

Connection ENG 45
22 Connection
Busch Universal Master Dimmer with pushbutton mode
Fig. 2
6593U-xxx
The "N" terminal is only necessary in special cases (e.g.
noise emission of the load when the dimmer is switched
off). It has no influence on humming noises from a
transformer which is connected and switched on.