A solid state relay (SSR) is an electronic (as opposed to mechanical) switch that is able to control a large amount of current with a small amount of input. Compared to a mechanical relay, SSR’s are capable of switching on and off on the order of milliseconds and hypothetically have a lifespan of switching in the millions of times. From a speed perspective, a mechanical relay would likely be fine, but it’s lifespan would be less than a few dozen brew sessions. (more…)