DELTA4000 Series

12 kV insulation diagnostic system

  • Power factor test set
  • Automatic and manual operation
  • Accurate and repeatable measurement results with high noise suppression
  • Lightweight, rugged two-piece design
  • New built-in intelligent temperature correction (patent pending)
  • New automatic voltage dependence detection (patent pending)

DELTA4000 series is a fully automatic 12 kV insulation power factor / dissipation factor (tan delta) test set designed for condition assessment of electrical insulation in high voltage apparatus such as transformers, bushings, circuit breakers, cables, lightning arresters, and rotating machinery.

Two configurations make up the series:

  • DELTA4110 with external computer (not included) consists of the DELTA4100 control unit and DELTA4010 high-voltage unit
  • DELTA4310A touch display interface comes with onboard computer, PowerDB software and printer and allows connection to and control of MWA300, TTR300/310E, MTO300, MLR10 and some Megger insulation resistance instruments. 
Technical Documents
Technical guide
A Guide to Transformer Ratio Measurements
Technical guide
Case study: Identifying aging and installation issues in an HV bushing
Technical guide
Case study: NB DFR on HV CVTs
Technical guide
DELTA4000 12 kV insulation diagnostic system application guide
Transformer Test Instrument Software Updates for TTR330A, MTO330A, MWA330A, DELTA4310A

The following components have been updated:

PowerDB ________________ V11.2.10 

MTOTestXP ______________ 2019.12.03.1

Delta Manual Control ______________   

Instrument Config ______ 1.0.20023.1919

Splash Screen __________ 1.0.21075.830

Factory Config _________ 1.0.21122.850

Megger Update Manager __ 1.0.21165.1032



- Megger recommends that you return your instrument annually for calibration verification.
- Any instrument returned for re-calibration will be updated with the latest firmware and software versions.
- Certified Factory Calibration is valid for one year.


Incorrect installation of updates or incomplete updates may cause the equipment to become unusable.

If damage occurs from improper updates, the customer may be responsible for repair costs.

Software updates for TTR330A, MTO330A, MWA330A and DELTA4310A

Download this zip file, extract, and run the executable.


256bit Hash:

763 MB | 02/08/2022
745.9 MB | 04/07/22
Update Instructions

Please download and read these instructions before performing the update.


623.9 KB | 04/07/22