Siemens 3RT1017-2BB48-0NA3 — SIRIUS Power Contactor, Size S00
The Siemens 3RT1017-2BB48-0NA3 is a SIRIUS-brand power contactor in frame size S00, designed for switching motor loads up to 5.5 kW at 690 V AC-3 duty — that's the rating that governs real motor starts, not the AC-1 resistive number. The 24 V DC coil pulls in at 85% of rated voltage (0.85 x Us) and drops out at 10% (0.1 x Us), giving a clean margin for control voltage sag on a 24 VDC bus. Spring-loaded terminals on the main circuit accept 2x (0.25... 2.5 mm²) solid or stranded, so no ferrule crimp needed for the typical control-wire gauges. Mechanical life is rated at 30,000,000 cycles — that's the contactor mechanism, not the contacts under load. For a conveyor or pump start-stop application, that's a decade-plus of daily cycling before the armature wears. The 45 mm width and 114 mm depth fit a standard 35 mm DIN rail (DIN EN 50022) with screw or snap-on mounting, and side-by-side mounting is allowed with 6 mm clearance to adjacent devices for heat dissipation.
Switching Ratings — What the Numbers Mean
AC-3 at 400 V: 5.5 kW (the motor-starting duty that matters for induction motors up to 7.5 hp). AC-4 at 400 V: 8.5 A (for inching or plug-reverse applications where the contactor breaks stalled-rotor current). DC switching is limited: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V — the arc extinction in DC is harder, so these are the maximum make/break currents. For resistive loads (AC-12), the maximum operating current is 10 A. Coil inrush (closing power) and holding power are both 3.3 W DC — the solenoid is a DC economizer design, so the coil doesn't overheat in continuous duty. Pollution degree 3 means it's rated for industrial environments with conductive dust or condensation, not just clean dry panels.
Mounting and Wiring
Mounts on 35 mm DIN rail per DIN EN 50022 via screw or snap-on. The 45 mm width and 114 mm depth leave room for auxiliary contact blocks on the front. Spring-loaded terminals for the main circuit accept 2x (0.25... 2.5 mm²) or AWG 24...14 — strip length is standard 8–10 mm. Side-by-side mounting is allowed; no derating required for adjacent contactors at rated load. One instantaneous NO auxiliary contact is built in. For type 2 coordination (no damage to the contactor under short circuit), use a gL/gG fuse rated 20 A; for type 1 coordination (contactor may need replacement after fault), use 35 A. The IP20 rating on the front and terminals means finger-safe but not washdown — keep it inside the enclosure.