What this contactor is and what the ratings mean
The Siemens 3RT2325-1AC20-ZX95 is a 4-pole contactor from the SIRIUS family, Size S0, with screw terminals. Its AC-1 rating of 35 A at 24 V AC, 50/60 Hz defines the resistive load it can switch continuously — think heater banks, lighting, or transformer primaries, where inrush is minimal. The 4 NO main poles give you four independently switched circuits, all normally open. The integrated auxiliary contact block (1 NO + 1 NC) handles feedback or interlocking without a separate add-on.
Where it fits in the panel
Size S0 is the standard footprint for this current class on a DIN rail. The screw terminals accept solid or ferruled stranded conductors typical of control panel wiring. The 24 V AC coil is common in North American and European control circuits where a control transformer supplies the coil voltage. The 50/60 Hz rating means it works on either line frequency without derating.