Siemens SIRIUS 3RT1017-2BB44-3MA0 is a size S00 power contactor with a 24 VDC coil, rated for 5.5 kW at 400 V AC-3. Three normally open main contacts handle the load; the magnet coil draws 3.3 W both closing and holding. Spring-loaded terminals accept 2x (0.25 to 2.5 mm²) solid or stranded wire.
Mounting and integration
Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022. Side-by-side mounting is supported with a 6 mm gap to the side. Panel depth allowance: 114 mm. Pollution degree 3 rated, so it's suited for industrial enclosures where conductive dust or condensation may be present.
What the ratings mean
The 5.5 kW AC-3 rating at 400 V covers standard squirrel-cage motor switching — that's the load a contactor this size typically sees. AC-4 at 400 V is 8.5 A, which applies for inching or plugging duty where the contactor makes and breaks stalled-rotor current. The 24 VDC coil holds at 3.3 W; verify the control transformer or power supply can deliver that continuously. The 10 A AC-12 rating covers resistive loads like heaters.