SIRIUS S00 auxiliary contactor — 3 NO, 45 mm wide
The 3RH2131-1KG40-0LA4: It is designed for switching control circuits, signal interlocking, and extending the contact set of a main contactor in a motor starter or control relay circuit.
These are the maximum continuous switching currents per contact; the actual load current must stay within these limits for the applied voltage to avoid contact welding or excessive arcing. The built-in suppressor diode across the coil (closing power 13 W at DC) reduces voltage spikes on the control circuit, protecting the PLC output or relay driving it.
Panel integration and environmental limits
These are the minimum air gaps to adjacent components or enclosure walls for heat dissipation and arc flash containment. The mechanical endurance is 30 million switching cycles typical — this is the life expectancy of the contactor mechanism before wear, not the electrical endurance which depends on the switched load.