Use Taco’s exclusive Plug-In PowerPort Cards with any Taco Expandable Control (-EXP models) to enhance total system integration and performance. Each Taco Expandable Relay comes standard with three PowerPort slots to accept any combination of cards. By controlling the operation of the circulators attached to the switching relay, PC600 cards are an ideal way for you to provide energy savings, system protection and an increased comfort level. There are no complex controls to wire—just plug the cards into any of the slots provided. Mix and match PowerPort Cards for post purge, priority protection and universal timer/pump exercise to quickly customize any system. You can also use PC600 cards without additional wiring in parallel with Taco Add-on Power Controls to add even greater system control and boiler optimization.