S00 frame, 2 NO, and what the DC switching curve means
The 3RH2122-2KG40-0LA4: The steep derating reflects the DC arc extinction challenge — unlike AC, there is no natural zero-crossing, so the contact gap must stretch the arc until it extinguishes.
Mounting flexibility and panel integration
This matters when packing multiple contactors side-by-side in a panel — the 6 mm side gap is the minimum to prevent inter-device arcing at the rated pollution degree 3. The coil is fitted with a suppressor diode internally — no external snubber needed for DC control circuits. The product extension auxiliary switch is available, meaning additional contact blocks can be stacked onto this base unit without removing it from the rail.