Circulator switching relay adapters are now in production at IVAR North America. The SRA100 switches one circulator and the PRA100 switches two circulators with priority for domestic hot water. Wiring is foolproof with clearly labeled connectors and simple instructions. The circulator switching relays are mounted in a rigid enclosure for time-savings and added safety. IVAR North America (NA) designs and manufactures hydronic heating systems and controls.