The Echo Relay Panel Mains Feed and Feedthrough panels round out ETC’s product offerings for power control. The mains fed Echo Relay Panel is an architect-friendly, 120V or 277V panel with mix-and-match 0 to 10V control with one-, two-, and three-pole relays within the panel itself, as well as additional phase-adaptive dimmers. The feedthrough panel provides dimming, switching, and emergency circuit lighting with 24 or 48 20A relays that support both 120V and 277V power. etcconnect.com