Megger Phase Rotation Testers
Discover top-rated Megger phase rotation testers for precise electrical testing. Ensure accuracy and reliability in your projects. Read the article now!
Find out more about Megger Phase Rotation Testers below.

- Identify correct phase sequences
- Rotating LEDs
- Audible tones

- Combined voltmeter, static motor & insulation resistance testers, DLRO & LCR meter
- Temperature-compensated insulation resistance tests
- Robust, IP54 design with guard terminals
About Megger Phase Rotation Testers
Megger Phase Rotation Testers are specialised instruments designed to determine the phase sequence, or phase rotation, of three-phase electrical systems. Accurate identification of phase sequence is crucial to ensure the correct operation of three-phase equipment, such as motors and transformers, as an incorrect phase connection can lead to malfunction or damage.
Key Functions
- Phase Sequence Identification: These Phase Rotation Testers ascertain the order in which the phases (typically labelled A, B, and C) reach their respective peak voltages. Correct phase sequence ensures that motors rotate in the intended direction and that other three-phase equipment functions properly.
- Motor Rotation Testing: Some models, like the Megger MTR105, combine a dedicated static motor tester with Megger’s tried and trusted suite of insulation resistance tests.
- Phase Direction: The Megger PSI410 indicates clockwise rotation with green LEDs that spin in a clockwise direction and a steady tone. Conversely, counterclockwise rotation is shown with red LEDs rotating counterclockwise, accompanied by a warbling tone.
Applications
- Electrical Installation and Maintenance: Electricians and maintenance personnel use phase rotation testers to verify the correct wiring of three-phase systems during installation or servicing, preventing equipment damage due to incorrect phase connections.
- Industrial Settings: In environments with multiple motors and complex electrical systems, these testers help ensure that all machinery operates with the correct phase sequence, maintaining operational efficiency and safety.
- Commissioning of Equipment: Before new equipment is brought online, phase rotation testers confirm that the electrical supply's phase sequence matches the equipment's requirements, thereby avoiding potential operational issues.
Megger phase rotation testers are indispensable tools for electricians, technicians, maintenance personnel, and commissioning engineers working with three-phase electrical systems.