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Brand: Extech
Extech PRT200 Non-Contact Phase Sequence Tester, 1000 V AC
Description
Extech PRT200 non-contact phase sequence tester up to 1000 V AC
The Extech PRT200 is a non-contact phase rotation tester used to find the phase sequence of a three-phase supply before a motor is connected or reconnected. Its three clips are placed on the insulated conductors, so the technician does not have to strip insulation or reach for bare high-voltage terminals. The instrument works on 75 to 1000 V AC at 45 to 65 Hz and shows clockwise or counter-clockwise rotation on LEDs with a matching buzzer pattern.
The PRT200 also shows whether each of the three conductors is live, which helps to identify an open phase. It is carried in a pouch with three built-in leads, four AA batteries and magnets on the rear panel for hands-free mounting on a panel door.
Technical specifications of the PRT200
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Extech / PRT200 |
| Measurement principle | Static induction (non-contact voltage detection) |
| Input voltage / frequency | 75 to 1000 V AC / 45 to 65 Hz |
| Maximum conductor diameter | 33 mm (1.3 in) |
| Lead length | 1.5 m (59 in); three color-coded fully insulated alligator clips |
| Indication | CW and CCW LEDs with rotation LEDs; live LEDs for each conductor; buzzer intermittent for clockwise, continuous for counter-clockwise |
| Brightness | Hi/Lo LED brightness switch for sunlight or dim areas |
| Auto power off | 5 minutes without sequence detection |
| Power | 4 x 1.5 V AA; low battery shown by flashing power LED |
| Operating conditions | -10 to 50 °C, maximum 80% RH |
| Safety rating | CAT IV 600 V / CAT III 1000 V, double insulation, pollution degree 2; CE |
| Dimensions / weight | 118 x 69 x 38 mm (4.7 x 2.7 x 1.5 in) / approx. 370 g |
These figures are taken from the PRT200 datasheet and user manual.
How the PRT200 reads phase sequence
The PRT200 senses the electric field around each conductor through its insulation and compares the timing of the three signals. If the voltage peaks arrive in the order L1, L2, L3, the sequence is clockwise; if the order is reversed, it is counter-clockwise. The user connects red to L1 (R, U), white to L2 (S, V) and blue to L3 (T, W), with the arrow mark on each clip positioned at the center of the conductor.
The status table in the manual explains what the LEDs mean. Three lit live LEDs show three live conductors; an unlit LED means an open phase; on a delta system, the phase with a flashing LED is the earth phase. The tester cannot identify a missing earth line on its own, so it complements, rather than replaces, a proper earth continuity check.
Why choose a non-contact tester such as the PRT200
- Clips go on insulated cables, so no stripping or opening of terminals is needed.
- The 1000 V AC range covers LV distribution and many 690 V supplies, with CAT III 1000 V rating.
- Magnets let the unit hang on a panel while both hands handle the cables.
- Alarm buzzer patterns tell the operator the result even when the LEDs are hard to see in daylight.
- A 33 mm maximum conductor diameter covers most LV cables used on motor feeders.
If you prefer a contact tester that can also check motor rotation without a supply, see the Extech 480403; for a low-cost graphical LCD tester, see the 480400.
Selection checklist for the PRT200
- Confirm your supply voltage lies between 75 and 1000 V AC at 45 to 65 Hz.
- Check that the cable diameter is no more than 33 mm.
- Decide whether non-contact connection to insulated conductors is a requirement of your safety procedure.
- Check that the safety category of CAT IV 600 V / CAT III 1000 V meets the installation category.
- Provide spare AA batteries for the rounds team.
Use and care of the PRT200
Switch the PRT200 on and watch the two-second LED self-test; do not use the tester if any LED fails to light. Attach the clips to the conductors without touching them while measuring, and never pull on the cable when removing the clips. Keep the instrument dry and out of direct sunlight, high temperature and condensation. Replace the four AA batteries when the power LED flashes, and do not open the battery compartment while connected to live conductors.
The instrument is not a substitute for a voltage detector or for a lock-out procedure; use it on energized circuits only as specified by your safety rules.
Applications of the PRT200 in Oman and the GCC
Before a pump, fan or compressor motor is connected after a shutdown, the phase sequence of the incoming feeder must be confirmed to avoid reverse rotation, which can damage pumps and mechanical seals. Electrical contractors on new projects use phase sequence testers when connecting generators, ATS panels and temporary supplies, where the sequence between utility and generator must match. The bright LEDs with a brightness switch help in direct sunlight at outdoor switchyards.
Extech phase testers compared
| Model | Voltage range | Indication and connection | Power |
|---|---|---|---|
| PRT200 | 75 to 1000 V AC | Non-contact clips on insulated conductors | Battery |
| 480400 | 40 to 600 V AC | Graphical LCD, direct clips | No battery |
| 480403 | 40 to 600 V AC | LEDs, plus motor rotation check | 9 V battery |
Information to send with an RFQ for the PRT200
- Part number PRT200 and the required quantity
- Supply voltage and typical cable diameter
- Spare batteries or accessories
- Delivery location in Oman or the GCC and the required lead time
- Whether calibration documentation or a traceable calibration certificate is required
Documents and quotation
A datasheet for the Extech PRT200 is attached on this page. It lists the input range, frequency range and features.
Send us the part number PRT200, the quantity and the delivery location in Oman or the GCC, and we will reply with availability and a quotation. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.
Other Models in the Extech Phase Testers Range
Seven Star LLC supplies models from the Extech Phase Testers range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Extech PRT200 Non-Contact Phase Sequence Tester, 1000 V AC | Electrical Testers & Multimeters | You are viewing this model |
| Extech 480400 Phase Sequence Tester, 600 V AC, Graphical LCD | Electrical Testers & Multimeters | View details |
| Extech 480403 Phase Sequence and Motor Rotation Tester | Electrical Testers & Multimeters | View details |
Datasheets & Documents
- Datasheet Extech PRT200 Datasheet Download
Reviews (0)
About brand
Extech Instruments is an American brand of handheld test and measurement instruments, founded in the early 1970s in Waltham, Massachusetts. FLIR Systems acquired Extech in 2007 for about $40 million, and FLIR itself became part of Teledyne in 2021. Extech is based in Nashua, New Hampshire, and makes meters for electrical, environmental and HVAC testing.
Extech company profile
| Founded | Early 1970s, Waltham, Massachusetts |
|---|---|
| Headquarters | Nashua, New Hampshire (since 2011) |
| Ownership | Teledyne FLIR |
| Acquired by FLIR | 2007 |
| Product families | True RMS clamp meters and multimeters, insulation testers, power analysers, IR thermometers, light meters, vibration meters, sound, humidity and air quality meters |
Milestones
- 2007: FLIR Systems acquires Extech.
- 2011: Extech moves to Nashua.
- 2021: FLIR becomes part of Teledyne.
Meters, testers and inspection tools
The Extech range includes multimeters and clamp meters, insulation and resistance testers, power analyzers, thermometers, light and sound level meters, anemometers, tachometers, vibration meters, moisture meters, borescopes and water quality meters. Each datasheet and user manual lists ranges, accuracy, safety category and ordering codes, and many models are listed with NIST-traceable calibration versions ordered by adding -NIST to the part number.
Supply through Seven Star LLC
Seven Star LLC is an independent supplier in Muscat that quotes Extech products for projects in Oman and the GCC, with the official Extech datasheet and user manual attached to each product page.
Extech products we list
Facts checked against FLIR's 2007 announcement and published Extech histories, October 2026.
FAQ
Questions about the Extech PRT200 Non-Contact Phase Sequence Tester,
Answers from our engineering team on installation, compatibility and integration.
01What voltage range does the Extech PRT200 cover?
The PRT200 covers 75 to 1000 V AC at 45 to 65 Hz, with a safety rating of CAT IV 600 V and CAT III 1000 V.
02How does the PRT200 measure without touching bare conductors?
It uses static induction through the cable insulation. The three clips are placed on insulated conductors, so no stripping is needed.
03What is the largest conductor the PRT200 can be clipped onto?
The maximum conductor diameter is 1.3 in (33 mm), with probe lead length of 59 in (1.5 m).
04How does the PRT200 show a reversed phase sequence?
Counter-clockwise rotation lights the CCW LED and rotation LEDs and the buzzer sounds continuously; clockwise sounds intermittently.
05Can the PRT200 detect an open phase?
Yes. Each conductor has a live LED, so if one of L1, L2 or L3 does not light, that phase is open. It cannot identify a missing earth line.
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