The MOSFET in turn operates a relay which supplies mains power to the iron. Temperature regulation comes as the iron heats the ceramic to the point at which the thermistor changes the MOSFET and ...
To support loads of widely varying sizes, the PCB supports an optoisolator that switches up to 1 A, a MOSFET that switches up to 2 A, and an on-board relay or SSR that can switch up to 3 A.
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