In Google, search for: "HA027985PL" filetype:pdf or "Eurotherm 275 instrukcja obsługi PDF"

Before powering the unit, verify the voltage requirements listed on the side label (typically 85-264V AC or 24V AC/DC). Terminals 1 & 2: Main AC power supply. Terminals 3 & 4: Control output (Relay or Logic). Terminals 10 (+) & 11 (-): Thermocouple or sensor input.