The output relay drops out when the contact T1-T2 is closed. The output relay picks up immediately if the connected contact between T1 and T2 opens.
If the contact T1-T2 closes again, the relay drops out again only after the reset button is pressed.
The terminals T1 and T2 carry system voltage.
An LED indicates the control state of the relay. The module is designed to be mounted onto DIN/EN top-hat mounting rails.

At a glance:

Thermal protection of (pump) motors
Compact design
Easy to install