I am using a safety PLC from Schneider and it is connected to a safety output relay with model number XPSMCMRO0004. The datasheet mentions that the min and max switching current is 20mA to 6Amp respectively. I wanted to ask how is switching current different from Load Current. As i understand switching current is just to switch the coil of the relay and it should be different or independent of the load current. Or are they the same in this case? Any help will be appreicated.
In this case, switching current is the current that the contacts can safely and reliably switch. There is a low current limit (20 mA) as low currents may not reliably "burn through" oxidation or other contamination on the contacts.
Switched current affects failure modes due to oxidation below wetting current or above max elevates contact temperature during arcs.
Load current is steady state. For example a light bulb has surge up to 10x turning on and diode bridge cap loads are similar.
Switching events are usually worst case.