This digital output module transmits control signals from the automation device to the connected actuators.
The internal system voltage triggers the relay.
The NO contacts are electrically isolated.
The switched status of the relay is shown by a LED.

Disclaimer:

 The WAGO modules that we sell have ever been used in test setups and/or have never been used in a setup, but have been purchased new for this purpose. The new modules are still in the original sealed packaging. The modules already used have not been used for more than two weeks for testing purposes.
 If it concerns a used product, this will be stated in the title.