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TPT9000 Transformer Polarity Tester

5.0 (4 reviews)

The TPT9000 Transformer Polarity Tester is a smart and lightweight plug-and-play instrument that accurately determines the polarity of current and voltage transformers.

  • Fast polarity testing of both voltage and current transformers
  • Compact and light
  • Easy to use, plug & play
  • Smart detection of incorrect connection
  • Proving unit included in the kit as standard
  • Fused lead sets included for user safety
  • Supplied in a protective case.
  • Long battery life
  • Built in battery monitor


The TPT9000 Transformer Polarity Tester represents an advanced solution tailored for Commissioning Engineers, facilitating precise determination of current and voltage transformer polarity. With its user-friendly plug-and-play design, this instrument ensures effortless operation. Additionally, its lightweight build and magnetized back panel enable convenient storage on metallic walls or panels.

By incorporating automatic detection capabilities, the TPT9000 readily identifies incorrect transformer connections. Furthermore, it includes a proving unit to verify on-site functionality. The comprehensive package also features a set of 600V CAT IV fused test leads with shrouded 4mm connectors and four F500mA HRC fuses.

Designed explicitly for “dead” systems, where external voltages are absent, the TPT9000 avoids connection to live systems for optimal safety. Prior to usage, always ensure the device under test is powered off.

The TPT9000 operates flawlessly in industrial and electrical substation environments at altitudes of up to 2000m above sea level. Its performance remains unaffected within the temperature range of 0°C to 45°C, while storage can be safely conducted between -20°C and 60°C.

A single PP3 9V battery powers the TPT9000, diligently monitored to prevent testing below the acceptable battery voltage threshold.

For your convenience, our esteemed partners, including Acutest, Alpha Electronics, Cuthbertson Laird, Norwich Instrument Services, and PASS Ltd, proudly offer the TPT9000 Transformer Polarity Tester in the United Kingdom. Customers outside Great Britain can conveniently order through our extensive worldwide distribution network.

TPT9000 Operating Manual


TPT9000 Quick Start Guide


TPT9000 Datasheet


Additional information

Weight0.6 kg
Dimensions118 × 79 × 32 mm
Supplied Accessories

User manual
Calibration certificate
Spare fuses
PP3 battery
Proving unit
4 x 1m fused 4mm leads
2 x red croc clips
2 x black croc clips
Quick start guide
Black carry pouch

4 reviews for TPT9000 Transformer Polarity Tester

  1. Yasin Eren

    I do a lot of commissioning and used one from a friend. One week later I bought one for myself and used it ever since. Really like the magnetic back panel.

  2. Amar Singh

    We ordered 5 for our engineers and all have been impressed.

  3. Johannes Schmidt

    Didn’t expect the impact the TPT9000 will have on my work. It has helped me save a lot of time and effort.

  4. Miguel Torres

    Everything I need for commissioning in one bag. Being able to figure out polarity by press of a button is amazing.

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