The 3RU2146-4LD0: Trip Class 10 means the relay will trip within 10 seconds at 7.2× the set current — standard for standard-duty motor starting where the start-up transient is under 10 seconds. The 45 kW at 400 V rating tells you the maximum motor power this relay can protect on a 400 V three-phase supply; at 690 V it covers up to 75 kW. Temperature compensation is active from -40 to +60 °C, so the trip curve stays accurate across a wide ambient range without manual adjustment.
Fastening method is contactor mounting — it snaps onto the matching SIRIUS contactor, no DIN rail needed. The main circuit accepts solid conductors 2×(2.5–16 mm²) and stranded 2×(6–16 mm²), 2×(10–50 mm²), or 1×(10–70 mm²). Auxiliary control wiring uses 2×(0.5–2.5 mm²) solid or stranded.
Contact ratings and auxiliary circuit
The auxiliary contacts are rated for various control voltages: 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. The note "for message 'Tripped'" indicates this is the signalling contact that changes state when the relay trips, used for remote indication or PLC input.
Compliance and substance restrictions
The relay carries a substance prohibitance date of 03/01/2017, confirming RoHS/REACH compliance from that date onward.