The SR501-HC-4 is the high current version of Taco's SR501-4 single zone pump switching relay. With universal thermostat compatibility, it is designed to integrate quickly and effortlessly into any larger hydronic system, bringing Taco reliability to your zoned operations. The SR501-HC-4's enclosure is unobtrusive and easy to mount in tight spaces, and the PC board was designed for quick maintenance and clean, simple wiring.
Easy-to-interpret external diagnostic lights and "ice cube" style replaceable relays mean that servicing a Taco switching relay is always easy.
The SR501-HC-4 allows a larger electrical load than standard switching relays. It is a single zone switching relay, but a second zone may be added at the expense of the boiler enable connection.