This is a replacement 175C thermal cut out switch for the BrewZilla 65L & DigiBoil 65L Units. This particular unit is a 175C thermal cut out switch/overload.

This thermal cut out switch is mounted directly to the heating element so as soon as the heating element get too hot the bi-metal switch will activate and cut the power to the element. It can also trigger an E3 or E4 error when this happens on the display.