There is a programmable timer inside that keeps cycles running the way you want.
HF2160-1A-12DE 30A 12VDC Air Conditioner Water Heater Relay 4Pins
You will find that the Klixon brand is part of this relay, and that makes sense.
A nice touch is the compact shape, which leaves room for other parts in crowded enclosures.
What stands out about this relay is the clear Littelfuse branding on the casing.