The relay on board of the RUT955 is a Single Pole Relay - Normally Open. This means that when the Logical Status of the output is High (activated) the relay will close and will form a Bridge between the pins 5 and 10. Basically it acts as a switch. The maximum voltage it can handle is 24V at a maximum current of 4 Amps.
In the link below you will find more about the IOs of the device.