The relay card is an electronic module which is used for the potential-free exchange of signals between a UPS and a higher-level controller.
The user thus has the possibility of receiving completely galvanically separated signals from the UPS and sending commands to the UPS.
The output signals remain until the UPS is switched off and de-energized.
Generally speaking, the UPS (and thus the relay card) is de-energized, all contacts of the relay card open, regardless of whether they are configured as normally closed or normally open.