Features:Microprocessor-controlledIndicates phase rotationIndicates phase presenceTest for disconnection sensitivityIndicates battery statusTest for disconnection timeMeasure voltage phase to earthSelect one of 3 Phase to test ELCBColor coded test leadsPhase presence indication from as low as 100VacVery low consumptionFused earth leakage testerELCB works 50Vac to 330Vac 50Hz / 60HzLed indication of Voltage on ELCBPhase rotation and presence does not require battery to indicateEN 61010-1 CAT III 550V / EN 61326-1This Test Instrument is a combined 3 Phases Presence and Rotation Indicator combined with a 3 Phases Industrial Earth Leakage Tester.When utilized as a 3 Phase Presence and Rotation Indicator, the instrument does not use the batteries and can still be utilized if the batteries are not present or if the batteries are too low.The 3 phase Presence and Rotation Indicator which is inside the 6221 EL, takes its power from the circuit under test.The Earth Leakage can be utilized on a Single Phase (up to 317Vac Line to Earth) or a 3 Phase Powered System (550V Line to Line or Phase to Phase) with a protective Earth conductor. The Earth Leakage requires batteries.When utilized on a single phase, ensure current connection between Line and Earth before using the tester.When utilized on a 3 Phase Powered System, the instrument is then utilized as a 3 Phases Presence and Rotation Indicator and a Earth leakage tester (selecting which phase to Earth will be utilized for the ELCB test).When utilized on a 3 Phases Powered System, this instrument is a rotary field indication instrument which display all three phases by lighting up its corresponding Lamp. It display the rotation (clockwise or anti-clockwise) on a LED.To test the tripping time or the tripping current of a Earth Leakage Circuit Breaker, make sure to connect the earth wire.This instrument represents the quickest and easiest way for servicing, repairing and electrical maintenance of 3 phase system with earth leakage.With this equipment, you can, before connecting Load to Supply: On the supply side; Quickly verify the presence of the three Phases on a 3 Phases Power System.