The SENTRON 5TT5542 is a remote control switch rated 16 A with two normally-open contacts, switching at 110 V AC/DC. It's a panel-mount component for remote switching of lighting, heating, or small motor loads in commercial and industrial control cabinets — think contactor-style duty but in a compact DIN-rail footprint.
The 16 A rating is the thermal continuous current through each NO pole. For resistive loads you can run the full 16 A; for inductive loads derate per the manufacturer's switching curve.
Deployment context
The compact width — typical for a 16 A remote switch — saves rail space compared to a full-size contactor. Terminal design accepts up to 6 mm² conductor, so it handles the incoming feed for a sub-distribution board or a lighting contactor panel.