Panel fit and wiring capacity
The 3RT2544-1AB00 is a Size S3 contactor from the SIRIUS family, measuring 70 mm wide by 140 mm high by 152 mm deep — the depth is the dimension that extends behind the DIN rail, so budget that into your enclosure back-panel layout.
Coil and auxiliary contact ratings
The magnet coil is rated 24 V at 50 Hz, drawing 0.38 A holding current — screw-type terminals on the coil, so wire it with standard control wiring. At AC-1 maximum switching frequency it handles 900 operations per hour — that's the resistive-load ceiling; for motor loads (AC-3) the rate will be lower, but the contactor is sized for the duty.
Operating environment and clearances
Arcing time is 10 to 20 ms, and the AC operating time (pick-up + drop-out) is 11 to 21 ms — fast enough for most sequencing applications but verify against your PLC cycle time if you're using the auxiliary contacts for feedback.