What it is and where it lands
The Siemens 3RT1016-1KF41 is a SIRIUS power contactor in the compact Size S00 frame, designed for switching motor and resistive loads in control panels. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022, fitting the standard enclosure rail without adapters. The coil is rated 110 V DC, with a closing and holding power of 2.3 W — a steady-state draw that stays within the typical 24 V DC supply budget for a small panel section. A varistor surge suppressor is built into the coil circuit, so you don't need an external snubber for DC switching transients. The front face carries IP20 finger protection; the terminals are also rated IP20, which is standard for enclosed panel mounting.
What the ratings mean for your load
At 230 V rated value the contactor carries 6 A in AC-1 duty (resistive load). That's the thermal current for heater banks or lighting contactor applications where inrush is low. For motor loads, the AC-2 rating at 400 V is 4 kW — this covers wound-rotor motors where the contactor makes and breaks under load. The AC-4 rating at 400 V is 8.5 A, which governs reversing or plugging duty where the contactor interrupts full motor current at standstill. The contactor also carries 10 A at AC-12 (control-circuit duty, 24 V), 2 A at 60 V DC, 1 A at 110 V DC, and 0.3 A at 220 V DC. The DC switching capability is derated by voltage — the 110 V DC 1 A rating is the one that matches the coil voltage for auxiliary switching in the same panel. Maximum operating altitude is 2 000 m without derating; above that, air density reduction lowers the dielectric withstand and thermal dissipation. The ambient operating range is -25 to +60 °C, with the 60 °C ceiling typical for enclosed panels near process machinery.
Coordination and wiring
For Type 2 coordination (no weld after a short circuit) the required upstream fuse is gL/gG 20 A. For Type 1 coordination (welding allowed but no fire hazard) the fuse can be 35 A gL/gG. These values govern the short-circuit protection rating of the branch circuit. Main circuit terminals accept screw-type connections: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid or stranded. AWG equivalents are 2x (20 to 16), 2x (18 to 14), or 1x 12. The 45 mm width and 57.5 mm height leave room for side-by-side mounting (6 mm side clearance required) on the DIN rail. The contactor has one instantaneous auxiliary contact (1 NO/NC configurable). Mechanical life is rated at 30 million operations typical — this is the unloaded mechanical endurance; electrical life depends on the switching category and load current.
Sourcing and lifecycle
If you are evaluating a BOM freeze or a second-source gate, the closest functional peer in the SIRUS S00 family is the 3RT1016-1AR11 (same frame, same AC ratings, but with an AC coil instead of DC). The DC-coil variant (this one) is preferred for applications where the control voltage is already 110 V DC and you want the built-in varistor suppression without adding an external diode.