SIRIUS S00 power contactor with 110 VDC coil
The Siemens SIRIUS 3RT2016-2BF42 is a size S00 power contactor with a 110 VDC coil and spring-type terminals, built for switching loads in control panels and motor circuits. The coil holds at 110 VDC nominal and drops out below 0.8 of that voltage. The contactor snaps onto a 35 mm DIN rail per DIN EN 60715, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward and backward — useful when the panel layout forces an off-axis orientation.
DC switching capacity — what the ratings mean
The 3RT2016-2BF42 is rated for DC switching at several voltage points: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. These are the maximum currents the main contacts can interrupt at those DC voltages — DC arcs are harder to extinguish than AC, so the rating drops as voltage rises. The arcing time is 10 to 15 ms, and the total break time (including arc extinction) is 7 to 13 ms at DC — fast enough for most control and small motor circuits, but not a semiconductor-speed switch. Operating frequency varies by duty: up to 1 000 cycles per hour at AC-1 (resistive), 750 at AC-2 and AC-3 (motor starting/running), and 250 at AC-4 (plugging/inching). The AC-3e rating also maxes at 750 cycles per hour. These limits govern thermal rise in the contactor — exceeding them shortens life or causes welding.
Panel fit and wiring
The contactor measures 45 mm wide, 70 mm high, and 73 mm deep — a compact S00 footprint that fits standard 45 mm-wide DIN-rail slots. Clearance to adjacent devices: 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm to the side. Spring-type terminals accept solid or stranded wire from 0.5 to 4 mm², or two wires of the same range per clamp. No screw torque to check — strip, insert, and the spring holds. An auxiliary switch is built in, so you get one N.O. or N.C. feedback contact without adding a side-mount block — saves a slot on the rail.
Lifecycle and sourcing reality
Operating temperature range is -25 to +60 °C during operation, with storage from -55 to +80 °C. The storage range is wider because the contactor is not dissipating heat when stored — that limit governs handling, not running.