The 3RF3365-3BA04 is a 1-pole solid-state contactor from the Siemens SIRIUS 3RF33 family, rated for AC-15 switching duty at 27.5 A (40 °C ambient). AC-15 is the category for electromagnetic loads — solenoids, contactor coils, clutches — where the inrush can be several times the holding current. The 27.5 A figure is the thermal continuous current under that duty, not a motor-starting rating; for motor loads you'd look at AC-51 or AC-53a ratings on a different variant.
Mounts on DIN rail in a standard control panel. The ring cable terminal connection suits permanent wiring — no push-in or spring-cage termination here, so factor in ring lug crimping for the install. The 105 x 50 x 125 mm package leaves room for adjacent contactors or overload relays in the same row. Because it's solid-state, there's no coil dropout or contact wear to plan around; the 24 V DC control side draws a steady current, not a surge, which simplifies PLC output sizing.
RoHS compliant since 15-Jan-2024. Group code R711, product group 3725 are internal cataloging references; useful for cross-referencing in Siemens legacy systems or liquidation lots.