156 A at 480 V — AC-1 thermal current and what it means for your load
The Siemens 3RT1466-6XJ46-0LA2 is a Size S10 SIRIUS contactor rated 156 A at 480 V and 144 A at 600 V in AC-1 duty — that's the resistive or lightly inductive load rating, so it handles heater banks, lighting, or transformer primaries at those currents continuously without derating. The 72 VDC coil with a pick-up hold of 0.7x rated value means it pulls in reliably on a sagging DC bus, and the 80–100 ms dropout delay gives the PLC time to sequence downstream contactors off before the main drops. Operating range spans -40 to +70 °C ambient, so it lives in unheated enclosures or next to a motor without a heater — the storage band is even wider at -55 to +80 °C.
Screw fixing and mounting flexibility — panel integration notes
Fastening is screw fixing through an 11 mm hole — no DIN-rail clip on this variant, so budget for a backplate or sub-panel with the single mounting hole centred.
Terminal wiring capacity and auxiliary contact provision
An auxiliary switch is included, so you get at least one NO/NC feedback pair for the PLC input without adding a separate side-mount block.