Part identity and load rating
The Siemens 3RF3330-1AA14 is a SIRIUS 3RF33 series solid-state contactor, one-pole, rated 30 A in AC-1 duty at 40 °C ambient. That AC-1 rating covers resistive heating loads — think ovens, furnaces, or lighting banks where the inrush stays under 1.5× steady-state. The load circuit accepts 48 to 460 V AC/DC, and the coil is 24 V AC/DC, screw-terminated.
Packaged dimensions are 105 × 27 × 122 mm (L × W × H). The 27 mm width is a single modular unit on a DIN rail — it occupies one slot in a standard enclosure. Screw terminals accept the load and control wiring; no special tooling needed. The 1-pole design means it switches one phase; for three-phase resistive loads you need three units or a 3-pole variant.