The Siemens 5TT5522 is a SENTRON remote control switch rated 16 A at 400 V AC, with two normally open (2 NO) contacts and a 24 V AC/DC control voltage.
The 16 A rating holds at cos φ 0.6, so it handles motor or inductive loads that draw that current with a lagging power factor — not just resistive heaters. The 400 V AC supply voltage is the line side; the control coil is separate, 24 V AC or DC. Two NO contacts give you a single-pole double-throw equivalent but with two isolated make circuits, useful for pilot duty or splitting a load across two control paths.