What this contactor is and where it fits
The Siemens 3RT1044-3BB40 is a SIRIUS S3 power contactor. It carries a 24 VDC coil rated at 10 A at 24 VDC.
Key ratings and what they mean for your selection
The 24 VDC coil draws 10 A at its rated voltage — a standard PLC or relay output can drive it, but check your DC supply's inrush margin. At 60 VDC the switching capacity drops to 2 A, and at 220 VDC it's 0.3 A, so this is a low-voltage DC coil, not a high-voltage DC power contactor. The AC-3 maximum operating rate is 1 000 cycles per hour, which covers most conveyor and pump cycles without thermal buildup. The contactor is rated for pollution degree 3, so it's suited for industrial environments with conductive dust or condensation — not just clean control rooms.
Panel integration notes
The S3 frame measures 70 mm wide by 146 mm high by 152 mm deep. Side-by-side mounting is allowed.
Compliance and documentation
The contactor carries a substance prohibition date of 05/01/2012.