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Megger MTO300 Transformer Ohmmeter
  • Megger MTO300 Transformer Ohmmeter
  • Megger MTO300 Transformer Ohmmeter

Megger MTO300 Transformer Ohmmeter Without Leads

Megger authorised distributor and service centre.

Includes: AC power cord (IEC60320-C13 to US Standard) 17032, AC power cord (IEC60320-C13 to Schuko CEE 7/7) 17032-13, CAT5e patch cable 36798, Instruction manual ATVMMT0300, USB to ethernet adapter for use with MTO300 only 90001-541, PowerDB Lite, Ground lead, 15 ft (4.5 m) 4702-7, Canvas carrying bag.


NB. MTO300, No Controller, PC required - WITHOUT Leads.

The Megger MTO300 DC winding resistance test set delivers full eight-terminal/six-winding resistance measurement capability. It is designed to save time by testing all six windings without having to disconnect and reconnect leads. The MTO300 can be controlled by an external PC or other Megger products with on-board computer such as the DELTA3000, DELTA4310, TTR330, and FRAX150.

Also, the simultaneous winding magnetisation (SWM) method gives fast and reliable measurements even on large transformers with delta configuration on the low voltage side. Additionally, the MTO300 leads are interchangeable with the Megger TTR300 series of three-phase turns ratio instruments which eliminates additional connecting time for turns ratio measurements.


Automated 8-terminal/6-winding measurement capability.
Simultaneous winding magnetisation.
Tests operation of on-load tap-changers.
Built-in auto-demagnetisation feature.
Automatic discharge.

Megger MTO300 Specifications
Resistance Measurement/Display
Current Range (A) Resistance Range (Ω) Resolution (Ω)
10 A 10 µΩ to 0.2 Ω 0.000001
10 A 0.2 Ω to 2 Ω 0.0000
1 A 100 µΩ to 2 Ω 0.00001
1 A 2 Ω to 20 Ω 0.001
100 mA 1 mΩ to 20 Ω 0.0001
100 mA 20 Ω to 200 Ω 0.01
10 mA 10 mΩ to 200 Ω 0.001
10 mA 200 Ω to 2000 Ω 0.1
Input 85 - 264 VAC, 47 - 63 Hz, 1500 VA.
User Selectable Current ranges Up to: 10 mA / 100 mA / 1 A / 2.5 A / 5 A / 7.5 A / 10 A.
Open Circuit Voltage Up to 40 V Dc.
Measurement Voltage Up to 20 V Dc.
Max Power 2000 VA continuous.
Printer Interface Via external PC.
PC Interface Ethernet.
User Interface PowerDB on external PC.
Operating 14° F to 122° F (-10° C to 50° C).
Storage -58° F to +158° F (-50° C to +70° C).
Relative Humidity 0-90% non-condensing.
Communication/Control Software PowerDB Lite (PowerDB Pro, optional).
Safety/EMC/Vibration Meets the requirements of IEC-1010-1, CE and ASTM D999.75.
Case Ruggedised plastic case with removable lid and carrying strap.
Dimensions 8.5 H x 21.5 W x 13 D in (216 H x 546 W x 330 D mm).
Weight 29 lbs (13.1 kg).
Megger MTO300 warranty One-year.


Megger MTO300 Series Datasheet

PDF Specifications of the Megger MTO3XX Series Automated Six-Winding Transformer Ohmmeter.

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Megger MTO300 Transformer Ohmmeter Without Leads
Replacement Bag Canvas carrying bag. 2005-265
Replacement Lead Ground lead, 15 ft (4.5 m). 4702-1
Shielded Lead Sets 3-phase universal, 9 m (30 ft) H & X. 2008-30-KIT
Shielded Lead Sets 3-phase universal, 18 m (60 ft) H & X. 2008-60-KIT
Shielded Lead Sets 3-phase universal, 30 m (100 ft) H & X. 2008-100-KIT
Hand Switch Remote Hand Switch with 30 ft (9 m) lead. 30915-220
Case Transit Case. 2005-340

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