Megger MWA330A
Updated 2026-10-27
Specifications
Figures as the manufacturer states them on its product page or datasheet; each row links its data record.
- Data storage
- up to 100,000 data sets
- Excitation current range
- 0 to 500 mA, 3 digit resolution, ±(2 % of reading + 1 digit)
- Excitation voltages
- 8, 40 and 80 V AC
- Max dc test current
- 10 A
- Operating temperature
- -10 °C to +50 °C
- Turns ratio accuracy
- ±0.1 % (0.8 to 2000)
- Turns ratio range
- 80 V AC: ±0.1 % (0.8 to 2000), ±0.15 % (2001 to 4000), ±0.25 % (4001 to 10,000), ±0.30 % (10,001 to 45,000)
- Winding resistance accuracy
- ±0.25 % of range ±0.25 % of reading
Data records
- The manufacturer's page for the MWA330A was read on the date given in the value. Value: 2026-10-27.
- The manufacturer lists the MWA330A as a three-phase ratio and winding resistance analyzer that combines turns ratio and winding resistance testing in one unit. Value: winding resistance meter.
- The MWA330A has a built-in computer operated through a color touch screen and stores data sets on board.
- The MWA330A demagnetizes the transformer core after DC testing.
- The MWA330A performs automated single or multi-core heat run interval testing.
- The MWA330A monitors the transition current of an on-load tap changer to check make before break continuity through each tap transition.
- The MWA330A measures three-phase turns ratio, excitation current, polarity and phase angle deviation and detects the vector group automatically.
- The MWA330A measures the DC winding resistance of all high side and low side windings of a three-phase transformer from one lead set connection, with eight terminal, six winding capability.
- The MWA330A is a product of Megger. Value: Megger.
- The manufacturer gives the model designation as MWA330A. Value: MWA330A.
- Megger maintains a product page for the MWA330A on its own website, which is the page cited for this entry.
- The manufacturer states the internal data storage of the MWA330A. Value: up to 100,000 data sets.
- The manufacturer states the display of the MWA330A. Value: 305 mm (12 in) color touch screen.
- The manufacturer states the excitation current range and accuracy of the MWA330A. Value: 0 to 500 mA, 3 digit resolution, ±(2 % of reading + 1 digit).
- The manufacturer states the excitation voltages of the MWA330A for turns ratio and winding balance tests. Value: 8, 40 and 80 V AC.
- The manufacturer states a maximum DC output current for the winding resistance function of the MWA330A. Value: 10 A.
- The manufacturer states an operating temperature range for the MWA330A. Value: -10 °C to +50 °C.
- The manufacturer states the turns ratio accuracy of the MWA330A on its lowest ratio band. Value: ±0.1 % (0.8 to 2000).
- The manufacturer states the turns ratio accuracy of the MWA330A by ratio band at its highest excitation voltage. Value: 80 V AC: ±0.1 % (0.8 to 2000), ±0.15 % (2001 to 4000), ±0.25 % (4001 to 10,000), ±0.30 % (10,001 to 45,000).
- The manufacturer states the winding resistance accuracy of the MWA330A. Value: ±0.25 % of range ±0.25 % of reading.
- The datasheet names IEC 60076-2-1993 and C57.12.90-2013 as the accepted methods the automated heat run test of the MWA330A uses. Value: IEC 60076-2-1993, C57.12.90-2013.
- The datasheet states the MWA330A is designed to IEC 61010-1:2010 for safety. Value: IEC 61010-1:2010.
- The datasheet names IEC 61326-1:2012 for both emissions and immunity of the MWA330A. Value: IEC 61326-1:2012.
- The datasheet lists ANSI C57.12.70-1978, CEI/IEC 76-1:1993 and two further documents as the conventions the MWA330A uses for transformer winding phase relationship. Value: ANSI C57.12.70-1978; CEI/IEC 76-1:1993 and Publication 616:1978; AS-2374, Part 4-1982.
- Megger marks the product page for the MWA330A as discontinued. Value: discontinued.
- The catalog name of the model is written Megger MWA330A. Value: Megger MWA330A.
Sources
- Megger datasheet, MWA300/330A 3-Phase Ratio and Winding Resistance Analyzer data sheet (MWA3XX_DS_US_V06), web page edition, Megger. Held as: Public page. Publisher page
- Megger product page, MWA300 & MWA330A Three-Phase Ratio and Resistance Analyzers, web page edition, Megger. Held as: Public page. Publisher page
Changelog (55 entries)
| Date | Revision | Change |
|---|---|---|
| 2026-10-27 | created (prod.megger-mwa330a.checked) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.checked) | |
| 2026-10-27 | created (prod.megger-mwa330a.class) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.class) | |
| 2026-10-27 | created (prod.megger-mwa330a.function.built-in-computer) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.function.built-in-computer) | |
| 2026-10-27 | created (prod.megger-mwa330a.function.core-demagnetization) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.function.core-demagnetization) | |
| 2026-10-27 | created (prod.megger-mwa330a.function.heat-run) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.function.heat-run) | |
| 2026-10-27 | created (prod.megger-mwa330a.function.oltc-continuity) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.function.oltc-continuity) | |
| 2026-10-27 | created (prod.megger-mwa330a.function.turns-ratio) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.function.turns-ratio) | |
| 2026-10-27 | created (prod.megger-mwa330a.function.winding-resistance) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.function.winding-resistance) | |
| 2026-10-27 | created (prod.megger-mwa330a.manufacturer) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.manufacturer) | |
| 2026-10-27 | created (prod.megger-mwa330a.model) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.model) | |
| 2026-10-27 | created (prod.megger-mwa330a.product-page) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.product-page) | |
| 2026-10-27 | created (prod.megger-mwa330a.spec.data-storage) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.spec.data-storage) | |
| 2026-10-27 | created (prod.megger-mwa330a.spec.display) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.spec.display) | |
| 2026-10-27 | created (prod.megger-mwa330a.spec.excitation-current-range) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.spec.excitation-current-range) | |
| 2026-10-27 | created (prod.megger-mwa330a.spec.excitation-voltages) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.spec.excitation-voltages) | |
| 2026-10-27 | created (prod.megger-mwa330a.spec.max-dc-test-current) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.spec.max-dc-test-current) | |
| 2026-10-27 | created (prod.megger-mwa330a.spec.operating-temperature) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.spec.operating-temperature) | |
| 2026-10-27 | created (prod.megger-mwa330a.spec.turns-ratio-accuracy) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.spec.turns-ratio-accuracy) | |
| 2026-10-27 | created (prod.megger-mwa330a.spec.turns-ratio-range) | |
| 2026-10-27 | revised (prod.megger-mwa330a.spec.turns-ratio-range) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.spec.turns-ratio-range) | |
| 2026-10-27 | created (prod.megger-mwa330a.spec.winding-resistance-accuracy) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.spec.winding-resistance-accuracy) | |
| 2026-10-27 | created (prod.megger-mwa330a.standard.heat-run-methods) | |
| 2026-10-27 | revised (prod.megger-mwa330a.standard.heat-run-methods) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.standard.heat-run-methods) | |
| 2026-10-27 | created (prod.megger-mwa330a.standard.iec-61010-1) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.standard.iec-61010-1) | |
| 2026-10-27 | created (prod.megger-mwa330a.standard.iec-61326-1) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.standard.iec-61326-1) | |
| 2026-10-27 | created (prod.megger-mwa330a.standard.phase-relationship) | |
| 2026-10-27 | revised (prod.megger-mwa330a.standard.phase-relationship) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.standard.phase-relationship) | |
| 2026-10-27 | created (prod.megger-mwa330a.status) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.status) | |
| 2026-10-27 | created (prod.megger-mwa330a.title) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (prod.megger-mwa330a.title) |
Cite this page
Cite the governing standard for the fact itself; cite this page as the finding aid.
"Megger MWA330A." Test Instrument Reference. 2026-10-27. https://www.testinstrumentreference.com/products/megger-mwa330a/.
Test Instrument Reference, Megger MWA330A (Oct. 27, 2026), https://www.testinstrumentreference.com/products/megger-mwa330a/.
@misc{etr-products-megger-mwa330a,
title = {Megger MWA330A},
howpublished = {\url{https://www.testinstrumentreference.com/products/megger-mwa330a/}},
organization = {Test Instrument Reference},
publisher = {Test Instrument Reference},
year = {2026},
note = {last substantive change 2026-10-27}
}{{cite web |title=Megger MWA330A |website=Test Instrument Reference |publisher=Test Instrument Reference |url=https://www.testinstrumentreference.com/products/megger-mwa330a/ |date=2026-10-27 |access-date=}}