The Siemens 3RT1044-3EL24 is a SIRIUS S3 power contactor — the S3 frame size sits between the compact S2 and the larger S6 in the SIRIUS family, sized for motor switching and resistive loads in industrial control panels. The coil is 24 VDC — a common control voltage across PLC and relay logic panels. Rated operating range at 50 Hz is 0.8 to 1.1 times rated voltage, and at 60 Hz it's 0.85 to 1.1, so the coil holds in through brownout conditions down to about 19.2 VDC. Dropout typically occurs below 18 VDC, which is standard for this class.
Terminal and enclosure details
The main power terminals accept 2x (10... 50 mm²) stranded wire — that's a big lug range, covering everything from 8 AWG up to 1/0 AWG depending on the termination method. The control/auxiliary terminals take 2x (0.25... 2.5 mm²) solid or 2x (2.5... 16 mm²) stranded, which covers standard control wiring. The front of the contactor is IP20 with a cover or box terminal; the terminal body itself is IP00, so the panel enclosure provides the overall ingress protection. It means the contactor is designed for the usual panel conditions, not for clean rooms or sealed electronics cabinets without consideration of condensation.
Mechanical shock resistance is 10.6 g for 5 ms and 6.2 g for 10 ms on AC, with DC arcing time of 14 to 20 ms. Those numbers matter if the contactor is mounted near heavy switchgear or on a mobile platform. Dimensions: 163 mm high, 70 mm wide, 188 mm deep.