What this contactor is and where it fits
The Siemens SIRIUS 3RT2016-2BB44-3MA0 is a Size S00 power contactor with a 24 V DC coil and spring-type terminals, built for snap-on mounting onto 35 mm DIN rail per DIN EN 60715. It occupies 45 mm of rail width and 121 mm depth, so it fits standard panel layouts without extra spacing.
Coil and switching ratings — what they mean for your load
The coil is rated 24 V DC with a pick-up value of 0.8 x rated voltage and a holding factor of 1.1 x rated voltage — meaning it pulls in reliably at 19.2 V and stays sealed up to 26.4 V. Rated operational current at 24 V is 6 A; at 400 V it carries 3 A. At 230 V it is rated for 1 hp motor loads. These numbers define the maximum continuous current the main contacts can handle at each voltage level — oversizing the contactor for your actual load current is standard practice to ensure contact life.
Switching frequency and mechanical endurance
Maximum switching rate depends on duty: 1 000 operations per hour at AC-1 (resistive), 750/h at AC-2 and AC-3 (motor starting), and 250/h at AC-4 (plugging/inching). Mechanical endurance is rated at 10 000 000 operations typical — a high-cycle figure that suits conveyor, pump, and fan applications where the contactor sees frequent starts.
Mounting and wiring notes
Mounting position is flexible: +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward/backward. Minimum clearances: 10 mm upwards and forwards, 10 mm downwards, 6 mm at the sides. Wire cross-section accepts solid or stranded 0.5 to 4 mm² (single or 2x 0.5–4 mm²). The spring-type terminals on the coil reduce wiring time — no screw tightening needed, just insert the stripped wire.