FSR K-Series General Purpose Relay Cards

The K-Series is the plain relay card an integrator reaches for when a control output has to move something it cannot drive directly. K-2 is DPDT, K-2S is SPDT and K-4 is 4PDT, all on 5 A contacts, all wired on barrier strips so nothing has to be lugged and crimped in a rack at 2am.

The K-10D is a different shape of the same idea: a five-pack of snap-away boards with two normally open SPST relays each, sized for GPIO and open-collector outputs like the FLEX ports. Break off what the job needs, land it on captive screws, and use it for screen up/down or reverse logic.