What the ratings mean for fit
The LC1E1801BD: The AC-3 rating at 18 A means it's sized for direct-on-line starting of three-phase squirrel-cage motors up to roughly 7.5 kW at 400 V. The same contactor also carries an AC-1 rating for resistive loads — useful if you're switching heaters or lighting banks in the same panel. The 24 V DC coil draws steady current with no hum; verify your control supply can hold above the dropout threshold under load. IP20 finger-safe terminals mean it's intended for inside an enclosure — not for washdown or outdoor exposure. Mounts on DIN rail or directly to a backplate, so it fits standard panel layouts without special brackets.