The Simple Zone Controller from MrPEX is designed for use with two- or three-wire MrPEX thermostats to control up to four zones, with up to three MrPEX thermal actuators or zone valves connected to each zone terminal. Each zone controls the associated actuator output terminal. Actuator terminals can use jumpers to extend the number of actuators per zone. Controller comes with a factory-installed internal fuse for protection. The end switch circuit from the actuators’ output terminals is ganged through the controller for easy wiring.