1. This instrument is only suitable for single-phase 230V /50Hz (with power supply voltage range 2. Wiring check: whether three LED indicators are correct, if two green indicators P-E and P-N are on, and red indicator is not on, then it is correct: the test can only be triggered if the wiring is correct 3. Phase angle selection: you can choose to start the test from positive (0 degree) or from half cycle negative (180 degree) 4. a??OL" is displayed for over range: when the test trip action time exceeds high test time, the LCD will display "OL mS" 5. Automatic data holding: After test is completed, the displayed measurement results are held for a certain period of time 6. AUTO RAMP test: The AUTO RAMP test can test tripping current and time simultaneously 7. Shutdown alarm function: After 3 minutes of operation, the instrument will let out a shutdown beep alarm 8. Power supply: Directly supplied by circuit under test (power supply 230V / 50Hz)Specification: Package Weight One Package Weight 1.07kgs / 2.36lb One Package Size 21cm * 20cm * 10cm / 8.27inch * 7.87inch * 3.94inch Qty per Carton 10 Carton Weight 11.50kgs / 25.35lb Carton Size 50cm * 43cm * 26cm / 19.69inch * 16.93inch * 10.24inch Loading Container 20GP: 477 cartons * 10 pcs = 4770 pcs 40HQ: 1107 cartons * 10 pcs = 11070 pcs