The Siemens 3RT1016-1BF42 is a SIRIUS power contactor in the S00 frame size, rated for a 110 V DC coil. It mounts via screw and snap-on onto a 35 mm DIN rail per DIN EN 50022. The 45 mm width and 57.5 mm height keep panel density manageable for a 4-pole contactor. Side-by-side mounting is supported with a 6 mm gap at the side for heat dissipation.
Ratings and what they mean for your panel
The AC-3 motor-switching rating at 400 V is 3 A, which translates to roughly 1.5 kW for a standard induction motor — sized for small pumps, fans, or conveyor drives. For resistive loads (AC-1), the contactor carries 10 A at 400 V. The DC coil draws 3.3 W holding power, which is low enough to keep the control transformer small. Screw terminals accept up to 2x 4 mm² or 1x 12 AWG for the main circuit, so it handles typical motor leads without a ferrule.
Integration notes
The 72 mm depth fits standard 100 mm deep enclosures with room for wiring behind the contactor. Pollution degree 3 means it is suited for industrial environments with conductive dust or humidity. The IP20 front and IP20 terminal protection require the contactor to be installed inside a panel or enclosure. For type 2 coordination (no weld under fault), use a 20 A gL/gG fuse upstream; for type 1 coordination, a 35 A fuse is allowed.