Honeywell R845A1030 Circulator Relay, 120 Volt DPST Honeywell switching relay Honeywell R845A1030 Switching relay with internal transformer, provides Dpst switching for hot water zone control systems, or spst control of two separate loads Enclosed intermediate Dpst switching relay for 24 volt 2 wire thermostat control of one line voltage and one line or low voltage devices. 120 volt primary power supply Integral transformer provides low voltage power for control circuit DPST; one pole line voltage, the other line or low voltage