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KV30-40D MK4 Test Set

5.0 (5 reviews)

Versatile high voltage instrument designed for testing insulation systems and measuring breakdown voltage up to 30kV.

  • Output voltage and current are metered by large, accurate true RMS digital meters
  • 0-30kV output voltage
  • 1.2kVA output capability
  • Key operated supply switch to prevent unauthorised operation
  • Dual overload protection
  • Variable electronic trip – 10-110% of rated output
  • Test timer
  • Voltage and current metering
  • Zero-volt interlock
  • External 24Vdc interlock circuit
  • Visual indication of test piece failure


The KV30-40D MK4 Test Set serves as a high voltage general purpose test instrument specifically designed for testing insulation systems and measuring breakdown voltage on electrical plant and components. It allows for variable output voltage ranging from zero to 30kV, providing accurate metering of both the output voltage and current. Additionally, it includes a zero-voltage interlock feature that restricts output energization unless the voltage control is set to zero.

This unit incorporates large, accurate true RMS digital meters that precisely measure the output voltage and current. The backlit meters, featuring a digit height of 19mm, ensure clear visibility even in different lighting conditions. To protect the test object and output, it offers an adjustable current trip. Users can set the trip level in 10% increments within the range of 10-110% of the rated output. In the event of a breakdown, the unit visually indicates the test object’s condition. Manual reset is necessary after a trip condition before resuming testing.

Execute timed tests effortlessly using the pre-selectable test timer provided with the KV30-40D MK4. It offers a range of durations, including 5, 10, 15, 20, 30 seconds, 1, 2, 3, or 5 minutes. An alarm will sound upon completion of the test time, ensuring precise timing. The unit also boasts automatic mains voltage selection, enabling seamless operation with different voltage inputs. Moreover, it features an external 24Vdc interlock circuit for connecting emergency off switches and enclosure interlocks, enhancing safety.

The KV30-40D MK4 AC Test Set arrives in a compact and portable case, facilitating easy transportation. It comes with a permanently connected 2-meter long HV output lead for convenient connectivity. As a standard accessory, you will receive an ES30 earthing stick, further enhancing the test system’s usability and functionality.

Our partners, such as AcutestAlpha ElectronicsCuthbertson LairdNorwich Instrument Services, and PASS Ltd offer the KV30-40D Mk4 in the United Kingdom. Additionally, if you are located outside Great Britain, you can conveniently order the product through our worldwide distribution network.

KV30-40D Mk4 Operating Manual


KV30-40D Mk4 Datasheet


Additional information

Weight42 kg
Dimensions300 × 400 × 470 mm
Supplied Accessories

User manual
Calibration certificate
Spare fuses
Mains lead
Earth lead
ES30 Earth stick
2 x T bars
Interlock plug

5 reviews for KV30-40D MK4 Test Set

  1. Daniel Green

    My KV30-40 suffered quite a bit of damage following a crash our van was involved in. Didn’t expect it could still be repaired but T&R surprised me. While the service took a while my unit performs as if it was brand new.

  2. Wong Chi-Keung

    We have 3 of these on our site. We really like the digital meters that replicate the old analogue ones.

  3. Léo Dubois

    Not a light instrument for sure but this piece of kit has been my trusted companion for years.

  4. Malik Khan

    Impressive instrument! I use an older version but look forward to upgrading in the future.

  5. Charles Wright

    I had a very old version that couldn’t be repaired anymore. T&R was kind enough to waive inspection and disposal fees and helped me upgrade to Mk4 through one of their distributors. Thank you guys!

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