The Siemens 3RF3330-3AA04 is a 1-pole SIRIUS 3RF33 solid-state contactor rated for AC-1 resistive loads at 30 A at 40 °C, with a load supply range of 48-460 V and a 24 V DC control input. It terminates via ring cable lug connections, which is the standard for panel wiring where vibration resistance matters. This is an active-production part, so the BOM line is stable for new builds and spares planning.
What the AC-1 rating means for your load
The AC-1 rating of 30 A at 40 °C defines the continuous resistive load the contactor can switch — think heaters, incandescent lighting banks, or resistive brake resistors. That 40 °C ambient derating point is the one to watch: inside a crowded panel at 50 °C, the usable current drops. For motor loads (AC-3 duty), this is not the right part; you would step to a 3RF34 or a conventional electromechanical contactor.
The 3RF3330-3AA04 snaps onto a DIN rail — standard 35 mm EN 60715 profile. The packaging dimensions of 105 x 27 x 122 mm mean it occupies a single modular width, so it slots into a panel without crowding adjacent devices. Ring cable lug termination suits permanent wiring; no push-in spring terminals here, so factor in crimping time during panel build.