SIRIUS S00, 24 VDC — what you're looking at
The 3RT2016-2BB42-0CC0: This is a Siemens SIRIUS power contactor in the S00 frame — the smallest in the SIRIUS family, sized for light motor and resistive loads up to the contact ratings. The 24 VDC coil pulls in at 0.8 of rated voltage and holds there; the spring-type terminals accept solid or stranded wire from 0.5 to 4 mm², or two conductors of the same range in parallel. It mounts on 35 mm DIN rail per DIN EN 60715, or screws directly to a panel. The S00 footprint is 45 mm wide, 70 mm tall, 73 mm deep — tight enough for high-density control cabinets where every rail slot counts.
Coil and contact ratings — the so-what
The 24 VDC coil is rated for continuous duty across -25 to +60 °C operating ambient. Pull-in time is 7 to 13 ms DC; arcing time on break runs 10 to 15 ms. Main contact ratings: at 24 VDC it switches 10 A, at 48 VDC 2 A, at 60 VDC 2 A, at 110 VDC 1 A, at 125 VDC 0.9 A, at 220 VDC 0.3 A, and at 400 VAC it handles 3 A. The AC-1 (resistive load) maximum switching rate is 1000 operations per hour; AC-3 (motor starting) and AC-3e are 750 ops/h; AC-4 (plugging/reversing) drops to 250 ops/h. That AC-4 ceiling is the one that catches people — if your application does inching or reversing under load, you're limited to one cycle every 14 seconds, not the 4 seconds the AC-3 number suggests.
Mounting and wiring — what fits where
Snaps onto 35 mm DIN rail per DIN EN 60715, or screws to a backplate. Mounting position is flexible: ±180° rotation on a vertical surface, and can be tilted forward or backward by ±22.5° on a vertical surface. Clearance: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the sides. Spring terminals — no screwdriver torque, no retightening. Strip length is standard for spring-cage: 8 to 10 mm, ferruled stranded preferred for multi-conductor pulls.