The Grundfos CU 301 control unit was developed for GRUNDFOS SQE submersible pumps. The CU 301 allows: constant pressure control based on a sensor signal the system pressure setting monitoring of operation and alarm indications. The CU 301 communicates with the pump via the pump cable, which means that no additional wiring is required between the CU301 and the pump. Electrical Specifications: Frequency: 50Hz Rated Voltage: 1 x 100-240V Delivery normally takes place within 24 hours (48 hours for Islands and remote areas).