Phase Sequence Testers
A phase sequence tester is a handheld test instrument that shows the order of the phases in a three-phase system, that is, the direction of rotation and a missing phase. It is used to confirm that the direction of rotation will be correct before three-phase loads such as motors, pumps and compressors are connected, and to detect a missing phase in a panel supply. This category includes the Unit UT261A digital phase sequence meter, which connects with alligator-clip test leads, needs no battery and operates in the 40-690 V range, and the UT262E phase detector, which takes non-contact measurements on the conductor through a clamp and runs on two AA batteries. Choose a device by the line-to-line voltage and frequency of your system, whether the connection to the conductor is contact or non-contact, the supply type and the indicator design. A phase sequence tester should not be confused with a phase sequence relay that is mounted in the panel and continuously protects the motor; the tester is only for manual measurement during connection.
Products
- Unit UT262E Non-Contact Phase Detector — Unit · SKU: UT262E · TRY 4,385.44 · In stock
- Unit UT 261A Digital Phase Sequence Meter — Unit · SKU: UT261A · TRY 2,740.90 · In stock
How to choose Phase Sequence Testers
A phase sequence tester is a handheld test instrument that shows the order of the phases in a three-phase system, that is, the direction of rotation and a missing phase. It is used to confirm that the direction of rotation will be correct before three-phase loads such as motors, pumps and compressors are connected, and to detect a missing phase in a panel supply.
- Identify the measurement or fastening task and the required insulation safety rating.
- Select jaw profile, cross-section range and accessories for the conductor or fastener standard.
- Check CAT voltage category and replacement tip or die availability for field conditions.
Frequently asked questions
What is Phase Sequence Testers and where is it used?
A phase sequence tester is a handheld test instrument that shows the order of the phases in a three-phase system, that is, the direction of rotation and a missing phase. It is used to confirm that the direction of rotation will be correct before three-phase loads such as motors, pumps and compressors are connected, and to detect a missing phase in a panel supply.
What should I compare when choosing Phase Sequence Testers?
Choose a device by the line-to-line voltage and frequency of your system, whether the connection to the conductor is contact or non-contact, the supply type and the indicator design.
Where can I find technical details for Phase Sequence Testers products?
A phase sequence tester should not be confused with a phase sequence relay that is mounted in the panel and continuously protects the motor; the tester is only for manual measurement during connection.
Electrical and Electronic Testers Selection Guide: Technical Criteria and Engineering Practice