The Siemens 3RT2016-1SB42 is a SIRIUS coupling contactor in size S00.
This contactor is rated for 1,000 operations per hour at AC-1 (resistive), 750 per hour at AC-2 and AC-3 (motor starting), and 250 per hour at AC-4 (plugging/inching). The AC-3e rating also sits at 750 ops/hour. Mechanical life is typical 30 million operations — that's a lot of cycles before the armature wears out, so it'll outlast most of the gear it's switching.
Terminals are screw-type, accepting solid or stranded wire from 0.5 to 4 mm², or two wires in parallel (2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm²). Clearance distances: 10 mm above and below, 10 mm forward, 6 mm to the side. The 45 mm width and 58 mm height with 73 mm depth mean it'll fit a standard 45 mm DIN slot with room for airflow.
The 3RT2016-1SB42 is listed as current production.