The literature for the transmitter describes exactly what the op wants to do.
“A customer may want to interlock an exhaust fan with a dryer; however, the equipment is often some distance apart. Integrators can clamp the current sensor to the cable; then the sensor is able to power itself, detect load currents and transmit radio signals using only the power residing around the cable. After the power is sensed, a radio transmission is generated which activates the wireless relay to turn on the exhaust fan, giving extra power to the vent system of the building. The repeater function of the relay receiver can extend the range of the exhaust vent by initiating another fan wirelessly.”