Features:1. Intelligent over-voltage and under-voltage protector, with high-quality ABS flame-retardant shell, safer to use.2. Exquisite appearance, light and convenient, accurate measurement, easy rail installation.3. Voltage, current and power display three-in-one on the same screen, clear data, clear at a glance.4. Overvoltage and undervoltage recovery values ??are adjustable, overcurrent automatically disconnects, overvoltage automatically disconnects.5. With voltage and current over-high or under-low protection, stable operation, stable performance, strong anti-interference.6. Wide range of applications: suitable for factories, laboratories, power monitoring, automation and other occasions, can meet the measurement of different equipment.Specifications:1. Voltage: AC 220V/230V (universal) 50/60Hz2. Current range: 1~40A, 1~63A (selectable)3. Capacity range: 0~9999Kwh4. Undervoltage protection: 140~210V5. Overvoltage protection: 230~300V6. Guide rail size: 35mm7. Product size: 85 x 65 x 36mmSpecification: Package Weight One Package Weight 0.18kgs / 0.41lb One Package Size 10cm * 5cm * 9cm / 3.94inch * 1.97inch * 3.54inch Qty per Carton 100 Carton Weight 20.50kgs / 45.19lb Carton Size 32cm * 47cm * 38cm / 12.6inch * 18.5inch * 14.96inch Loading Container 20GP: 466 cartons * 100 pcs = 46600 pcs 40HQ: 1083 cartons * 100 pcs = 108300 pcs