This is a replacement 175°C (347°F) thermal cut out switch for the BrewZilla 220V 35L, 65L & DigiBoil 65L Units.
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.
