ABB Busch-Universal 6593U-500 Manual De Instrucciones página 82

Installation
1.1.1.48
Supply and Load Connection
The supply is connected to the terminals L and N.
The load is connected to one of the terminals
(controlled outputs).
Connection to terminal N is an option and serves for
reducing the noise on the transformer load when
switched off.
Extensions
Any number of pushbuttons (e.g., 2020) can be
connected in parallel to allow switching and dimming
via pushbutton input terminal 1. Pushbutton control is
either back-to-back with L.