The SENTRON 5TT5535 is a remote control switch — N-type, rated for AC/DC 230 V, 16 A, with two normally open (2NO) contacts for central on/off switching of lighting or small loads from a remote location.
The 2NO configuration gives two independent switched circuits that close together on a command pulse, suited for centralised on/off control of lighting banks or small motorised valves. N-type designates the neutral-switching variant — the switch opens both phase and neutral, which is typical for lighting circuits where full isolation is required at the point of control.