This is a solid state relay (SSR) that is typically used for the PID kit brew function.
It is an SSR-40DA.
Input - 3-32VDC.
Output rating - 24-380VAC / 40Amps.
These products are typically current rated lower than the name suggests - so it is advised to limit this SSR to switching 25A maximum.
(a typical Gaggia espresso machine is rated at approximately 6A).
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