The Siemens 3RT1016-1HB42-ZW97 is a SIRIUS coupling relay rated for AC-3 duty at 4 kW / 400 V, with a 1 NC auxiliary contact and a DC 24 V coil accepting 0.7...1.25 times the rated control supply voltage. It is a 3-pole, size S00 unit with screw terminals, supplied in a multi-unit packing of 42 pieces arranged 2x1 layers.
The 1 NC auxiliary contact provides a feedback or status signal; the DC 24 V coil with a 0.7...1.25*US tolerance ensures reliable pick-up even if the control supply sags to about 16.8 V or rises to 30 V. Size S00 is the smallest SIRIUS frame, so it fits compact DIN-rail layouts without crowding adjacent devices.