The 3RF3320-2AA04: The spring-loaded terminal accepts 0.2–2.5 mm² solid or ferruled stranded wire. Strip length is 8 mm. The 105 x 27 x 122 mm package clips onto a standard DIN rail — no mounting screws needed, which saves panel space and speeds installation. The 24 VDC control input is common in modern PLC-driven panels. The AC-1 rating (resistive loads) at 20 A at 40 °C means this contactor is sized for heater banks, lighting, or transformer primaries — not motor starts, where AC-3 derating would apply.
RoHS compliant since 15-01-24. Export controls are AL: N / ECCN: 9N9999, so no special license is needed for most destinations. Group Code R711 and Product Group 3725 are internal Siemens cataloging fields; they don't affect fit or function but can help with cross-referencing in Siemens tools.