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.
[Hulk] was able to design a PCB with 12 modules on it ... It can be a hassle to go find the correct transistor and relay, solder it all on the project board, and hope it all works.
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