Proportional Control of AC Power

Proportionally Controlled Solid State Relays (PCSSR) found on below link can not only pass an AC power signal, but can control the average power delivery. Similar output to that of a TRIAC, however these can be “proportionally controlled” from low-voltage control circuitry.

https://www.digikey.com/products/en/relays/solid-state-relays/183?k=proportional&pkeyword=&sv=0&sf=1&FV=-8%7C183&quantity=&ColumnSort=0&page=1&pageSize=25