The relay is rated for 690 V and carries a CLASS 10 trip class, meaning it will trip within 10 seconds at 7.2× the set current — standard for protecting standard induction motors during startup.
The 3RU2146-4HB0 is rated for 22 kW at 400 V, 30 kW at 500 V, and 45 kW at 690 V — these are the motor power ratings it can protect at those line voltages. The auxiliary contact ratings cover a wide control-voltage range: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, and 0.75 A at 690 V. That means the same relay works in 24 VDC control circuits and 400 VAC signal circuits without a separate interface relay.
Main-circuit terminals accept solid wire 2x (2.5 to 16 mm²) and stranded wire 2x (6 to 16 mm²), 2x (10 to 50 mm²), or 1x (10 to 70 mm²). The auxiliary terminals accept solid or stranded 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). The screwdriver interface is a 4 mm hexagon socket — keep a hex bit in your kit, not a flathead. The relay mounts in any position, which helps when you're squeezing it into a tight corner of the panel.
The relay carries a substance prohibitance date of 03/01/2017, indicating RoHS and REACH compliance from that date.