What it is and what it does
The Siemens SIRIUS 3RT1016-1JA41 is a size S00 power contactor — the smallest frame in the SIRIUS contactor family, built for switching motor loads and resistive circuits in control panels. It carries a 10 A maximum operating current under AC-12 duty (resistive load), and is rated for AC-2 at 400 V at 4 kW and AC-4 at 400 V at 8.5 A, covering both starting and plugging/inching motor applications. The coil is DC-operated with a 2.3 W closing and holding power draw, and includes an integrated diode surge suppressor for back-EMF protection on the coil drive.
Mounting and integration
Mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 50022. The 45 mm width and 72 mm depth fit standard panel layouts; side-by-side mounting is allowed with no additional gap, saving rail space. Front and terminal protection is IP20, so it's safe for open-panel installation behind a locked enclosure door. The screw-type terminals for the main current circuit accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid/stranded wire, and 2x (20 to 16 AWG), 2x (18 to 14 AWG), or 1x 12 AWG for the main contacts. For type 2 coordination, use a 20 A gL/gG fuse; for type 1, a 35 A gL/gG fuse.