MT Series Programmable DC Power Supply

Magna-Power Electronics MT Series uses the same reliable current-fed power processing technology and controls as the rest of the MagnaDC programmable power supply product line, but with larger high-power modules: individual 100 kW, 150 kW and 250 kW power supplies. The high-frequency IGBT-based MT Series units are among the largest standard switched-mode power supplies on the market, minimizing the number of switching components when comparing to smaller module sizes. Scaling in the multi-megawatts is accomplished using the UID47 device, which provides master-slave control: one power supply takes command over the remaining units, for true system operation. As an added safety measure, all MT Series units include an input AC breaker rated for full power.

250 kW modules come standard with an embedded 12-pulse harmonic neutralizer, ensuring low total harmonic distortion (THD). Even higher quality AC waveforms are available with an external additional 500 kW 24-pulse or 1000 kW 48-pulse harmonic neutralizers, designed and manufactured exclusively by Magna-Power for its MT Series products.

MT Series Programmable DC Power Supply Image
Power Levels
100 kW to 2000 kW+
Number of Models
Build Time
6-8 weeks
Design and Manufacture


Fully Programmable DC Power

The MT Series features programmable voltage, current, and protection settings along with high accuracy measurements. The MT Series functions and features are accessible and configurable from a variety of control methods, including:

  • Front panel interface with stepless knobs
  • 37-pin isolated analog-digital user I/O
  • RS232 Computer interface with software and drivers

Various additional programming interfaces are available, such as LXI TCP/IP Ethernet (+LXI), IEEE-488 GPIB (+GPIB), Edgeport USB Accessory (+USB), RS485 Accessory (+RS485).

Designed for Safety

MT Series power supplies have extensive diagnostic functions, including:

  • AC Phase Loss
  • Excessive Thermal Conditions
  • Over Voltage Trip (Programmable)
  • Over Current Trip (Programmable)
  • Cleared Fuse
  • Excessive Program Line Voltage
  • Interlock Fault

When in standby or diagnostic fault, the AC mains are mechanically disconnected by an embedded AC contactor, providing confidence that the unit is only processing power when desired.

Finally, with a dedicated +5V interlock input pin and included +5V reference on all models, external emergency stop systems can be easily integrated using an external contact.

Extensive Programming Support

All MT Series MagnaDC power supplies come with a dedicated National Instruments LabVIEW™ driver, Interchangeable Virtual Instrument (IVI) driver, and support for a wide range of Standard Commands for Programmable Instrumentation (SCPI). These programming interfaces support full control, measurement, and monitoring of the MagnaLOAD. All of the MagnaLOAD's available communication interfaces are supported by these drivers and command sets, including: RS232, LXI TCP/IP Ethernet, IEEE-488 GPIB, USB or RS485.

Showcased in the following basic code examples, SCPI commands provide the simplest form of communication by using plain ASCII text and parameters sent over a basic socket connection. Over 50 commands are provided, with detailed documentation in the MT Series User Manual.

Finally, Magna-Power's RIS Panel software is provided allowing for a virtual control panel controlling the power supply via any of the available communication interfaces

import visa
rm = visa.ResourceManager()
magna_power = rm.open_resource(USB::0x0403::0x6015::1201-2358::INSTR)
magna_power.write('VOLT 1000')
magna_power.write('CURR 20')
magna_power = visa('ni','USB::0x0403::0x6015::1201-2358::INSTR');
idn = fscanf(magna_power)
fprintf(magna-power,'VOLT 1000')
fprintf(magna-power,'CURR 20')
string resourceString = "USB::0x0403::0x6015::1201-2358::INSTR";
mbSession = (MessageBasedSession)ResourceManager.GetLocalManager().Open(resourceString);
string idn;
mbSession.Timeout = 3000;
idn = mbSession.Query("*IDN?");
mbSession.Write("VOLT 1000");
mbSession.Write("CURR 20");
Current-Fed Topology

Current-Fed Topology: Robust Power Conversion

All MagnaDC programmable DC power supplies utilize high-frequency IGBT-based power processing in current-fed topology. This topology adds an additional stage over the conventional voltage-fed topology for enhanced control and system protection, ensuring that even under a fault condition, the power supply will self-protect. Due to the self-protecting characteristics of this topology, the possibility of fast rising current spikes and magnetic core saturation is eliminated.

In addition to its robust topology, key performance characteristics of MagnaDC programmable DC power supplies include:

  • High-accuracy voltage and current programming accuracy
  • Class-leading line and load regulation performance
  • High 3Φ AC input power factor with in-rush limiting circuitry
  • Computer and user I/O isolated from the power supply output

MT Series Harmonic Neutralization

Magna-Power's Harmonic Neutralizers eliminate families of harmonic components by multiplying the number of input phases with specially wound magnetic components, reducing the total harmonic distortion (THD). These magnetic components, in combination with equally loaded, high-power DC power supplies, offer a cost-effective solution to maintaining power quality at acceptable levels, enabling applications to benefit from Magna-Power's reliable high-frequency switch-mode power supplies, extended into multi-megawatts. A 12-pulse Harmonic Neutralizer is embedded in all 250 kW models and its installation is transparent to the end user. For applications demanding an even better THD level than that provided by a 12-pulse waveform, external 24-pulse and 48-pulse harmonic neutralizers are available from Magna-Power. Contact you local sales partner for more information.

Understanding AC Harmonic Waveforms

The following figures are representative of expected AC current waveforms for the various pulses available from Magna-Power Electronics power supplies. Standard models 1.5 kW through 150 kW produce 6-pulse waveforms, while 250 kW models produce 12-pulse waveforms. Magna-Power Electronics Harmonic Neutralizers suppress families of harmonics by increasing the number of power phases. It can be used when multiple power supplies are used in series or parallel and are equally loaded. Harmonic Neutralizers can produce 12-pulse, 18-pulse, 24-pulse, or 48-pulse waveforms which have harmonic current components on the order of 12n±1, 18n±1, 24n±1, or 48n±1, respectively. The following figures show the theoretical difference for waveforms with a different number of pulses. Harmonic Neutralizers are protected with appropriate sized primary-side circuit breakers.

Why Neutralize Harmonics?

Input current harmonics are a by-product of nearly all power supplies. Power can only be delivered to the load if the frequency and phase of the voltage and current match. For a three phase power supply using a three phase input rectifier, the input current has a theoretical spectrum of 6n±1 where n is an integer incrementing from 1; this is known as a 6-pulse waveform. This means that a power supply with a three phase input rectifier will produce input currents at 1, 5, 7, 11, 13, 17, 19 ... times the fundamental frequency. The theoretical magnitude decays as the reciprocal of the harmonic component. The 5th and 7th harmonic components have magnitudes of 20% and 14% of the fundamental component, respectively. Harmonics currents in power systems can find unusual paths and can cause problems if the magnitude is significant and there are loads sensitive to harmonic frequencies. For example, lighting ballasts have series connected capacitors and inductors which can be excited by harmonic currents. IEEE has introduced standard, IEEE 519, which defines recommended limits. Implementing this standard requires a knowledge of the power system and other loads producing harmonics. Unfortunately, the standard can allow the same power supply to possibly exceed limits in one application and not in another. In the same respect, a power supply may or may not can cause a harmonic related problem with or without meeting IEEE 519. The best solution to minimize the risk of a harmonic problem is to eliminate the harmonic current at the source.

6-Pulse AC Waveform 12-Pulse AC Waveform 24-Pulse AC Waveform 48-Pulse AC Waveform

Front Panel - D Version

The standard D Version front panel offers front panel provides a digital display with rotary front panel input, isolated 37-pin analog/digital I/O, and a RS232 computer interface. In addition, the D Version front panel provides digital 10-key entry, auto-sequencing with memory capability, and modulation for non-linear power profile emulation.

Front Panel - C Version

The C Version front panel is blank, providing on a switch to enable control power. All control must be performed by the provided isolated 37-pin analog/digital I/O or through a computer interface.

Power switch energizes control circuits without engaging main power
Engages and disengages main power via integrated mechanical contactor
Meters display output voltage, output current, voltage set point, current set point, over voltage trip and over current trip
Stepless rotary knob to set voltage-current
POWER: Indicates power output
STANDBY: Indicates control power only
REM SEN: Remote sense enabled
INT CTL: Front panel start/stop/clear enabled
EXT CTL: External start/stop/clear enabled
ROTARY: Front panel rotary knob input
EXT PGM: External analog voltage-current control
REMOTE: Computer control
Diagnostic Alarms
LOC: Interlock
PGL: External input voltage beyond limits
PHL: Under-voltage AC input
THL: Over-temperature condition
OVT: Over-voltage protection has tripped
OCT: Over-current protection has tripped
Function Keys
MENU: Selects function
ITEM: Selects item within function
V/I DIS: Displays voltage-current settings
TRIP DIS: Displays OVT and OCT setting
CLEAR: Clears settings or resets fault
ENTER: Select item
Memory location indicator, used for autosequencing applications
Digital input keypad
USA Flag

Designed and Manufactured in the USA, Available Worldwide

For complete control of quality, MagnaDC programmable DC power supplies are designed and manufactured at Magna-Power's vertically integrated USA manufacturing facility in Flemington, New Jersey. Heat-sinks and chassis are machined from aluminum. All sheet metal is fabricated and powder coated in-house. Magnetics are wound-to-order from validated designs based on a model's voltage and current. An automated surface-mount production line places components on printed circuit boards for control, driver, auxiliary power, and display circuits. And finally after assembly, products undergo comprehensive test and calibration, followed by an extended burn-in period.


There are 78 different models in the MT Series spanning power levels: 100 kW, 150 kW, 250 kW, 500 kW, 750 kW, 1000 kW+.

To determine the appropriate model:

  1. Select the desired Output Voltage Maximum (Vdc) from the left-most column.
  2. Select the desired Current Maximum (Adc) from the same row that contains your desired Voltage Maximum.
  3. Construct your model number according to the model ordering guide.
MT Series Ordering Guide
  100 kW 150 kW 250 kW 500 kW* 750 kW* 1000 kW*    
Voltage Maximum (Vdc) Current Maximum (Adc) Ripple (mVrms) Efficiency
16 6000 N/A N/A N/A N/A N/A 35 90%
20 5000 N/A N/A N/A N/A N/A 40 90%
25 4000 N/A N/A N/A N/A N/A 40 90%
32 3000 4500 N/A N/A N/A N/A 40 90%
40 2500 3750 6000 12000 18000 24000 40 91%
50 2000 3000 5000 10000 15000 20000 50 91%
60 1660 2500 4160 8320 12480 16640 60 91%
80 1250 1850 3000 6000 9000 12000 60 91%
100 1000 1500 2500 5000 7500 10000 60 91%
125 800 1200 2000 4000 6000 8000 100 91%
160 620 900 1500 3000 4500 6000 120 91%
200 500 750 1250 2500 3750 5000 125 91%
250 400 600 1000 2000 3000 4000 130 92%
300 333 500 833 1666 2499 3332 160 92%
375 270 400 660 1320 1980 2640 170 92%
400 250 375 625 1250 1875 2500 180 92%
500 200 300 500 1000 1500 2000 220 92%
600 160 240 400 800 1200 1600 250 92%
800 120 180 300 600 900 1200 300 92%
1000 100 150 250 500 750 1000 400 92%
1250 80 120 200 400 600 800 500 92%
1600 62 90 150 300 450 600 600 92%
2000 50 75 125 250 375 500 800 92%
2500 40 60 100 200 300 400 900 92%
3000 32 50 80 160 240 320 1000 92%
4000 24 36 60 120 180 240 1100 92%
5000 20 30 50 100 150 200 92%
6000 16.6 25 41.6 83.2 124.8 166.4 92%
AC Input Voltage (Vac) Input Current Per Phase (Aac)    
380/415 Vac, 3Φ 184 276 440 880 1320 1760    
440/480 Vac, 3Φ 159 238 380 760 1140 1520    


Input Specifications
3Φ AC Input Voltage
3Φ, 3-wire + ground
Available on all models
380 Vac (operating range 342 to 440 Vac)
415 Vac (operating range 373 to 456 Vac)
440 Vac (operating range 396 to 484 Vac)
480 Vac (operating range 432 to 528 Vac)
Input Frequency
50 to 60 Hz
Power Factor
> 0.92 at maximum power, 100 kW and 150 kW models
> 0.96 at maximum power, 250 kW models
AC Input Isolation
±2500 Vac, maximum input voltage to ground
Output Specifications
Voltage Ripple
Model specific. Refer to chart of available models.
Line Regulation
Voltage mode: ± 0.004% of full scale
Current mode: ± 0.02% of full scale
Load Regulation
Voltage mode: ± 0.01% of full scale
Current mode: ± 0.04% of full scale
Load Transient Response
2 ms to recover within ±1% of regulated output with a 50% to 100% or 100% to 50% step load change
± 0.10% for 8 hrs. after 30 min. warm-up
86% to 88%
Model specific. Refer to chart of available models.
Maximum Slew Rate
Standard Models
100 ms for an output voltage change from 0 to 63%
100 ms for an output current change from 0 to 63%
Maximum Slew Rate
Models with High Slew Rate (+HS) Option
4 ms for an output voltage change from 0 to 63%
8 ms for an output current change from 0 to 63%
Standard Models
3 Hz with remote analog voltage programming
2 Hz with remote analog current programming
Models with High Slew Rate (+HS) Option
60 Hz with remote analog voltage programming
45 Hz with remote analog current programming
DC Output Isolation
Models Rated ≤1000 Vdc
±1000 Vdc, maximum output voltage to ground
DC Output Isolation
Models Rated >1000 Vdc or Models With +ISO Option
±6000 Vdc, maximum output voltage to ground
Control Specifications
Voltage Programming Accuracy
± 0.075% of max rated voltage
Over Voltage Trip Programming Accuracy
± 0.075% of max rated voltage
Current Programming Accuracy
± 0.075% of max rated current
Over Current Trip Programming Accuracy
± 0.075% of max rated current
Voltage Readback Accuracy
± 0.2% of max rated voltage
Current Readback Accuracy
± 0.2% of max rated current
Load Regulation
Voltage mode: ± 0.01% of full scale
Current mode: ± 0.04% of full scale
Computer Command Protocol
Standard Commands for Programmable Instruments (SCPI)
External User I/O Port
Analog and Digital Programming
37-pin D-sub DC-37, female
Referenced to Earth ground; isolated from power supply output
See User Manual for pin layout
Analog Programming and Monitoring Levels
0-10 Vdc
Analog Output Impedances
Voltage output monitoring: 100 Ω
Current output monitoring: 100 Ω
+10V reference: 1 Ω
Digital Programming and Monitoring Limits
Input: 0 to 5 Vdc, 10 kΩ input impedance
Output: 0 to 5 Vdc, 5 mA drive capacity
Remote Sense Limits (Wired)
3% maximum voltage drop from output to load
Physical Specifications
Size and Weight
100 kW Models
Floor-standing double-bay cabinet with casters
67" H x 48" W x 31.5" D (170.2 x 121.9 x 80.0 cm)
1600 lbs (725.8 kg)
Size and Weight
150 kW Models
Floor-standing double-bay cabinet with casters
67" H x 48" W x 31.5" D (170.2 x 121.9 x 80.0 cm)
2100 lbs (952.5 kg)
Size and Weight
250 kW Models
Floor-standing triple-bay cabinet with casters
67" H x 72" W x 31.5" D (170.2 x 182.9 x 80.0 cm)
3300 lbs (1496.9 kg)
Environmental Specifications
Ambient Operating Temperature
0°C to 50°C
Storage Temperature
-25°C to +85°C
Relative humidity up to 95% non-condensing
Temperature Coefficient
0.04%/°C of maximum output voltage
0.06%/°C of maximum output current
Air Flow
Side air inlet, rear exhaust
Regulatory Compliance
Complies with European EMC Directive for test and measurement products
Complies with EN61010-1
CE Mark
RoHS Compliant


Front Side
100 kW and 150 kW Models
Rear Side
100 kW and 150 kW Models
Front Side
250 kW Models
Rear Side
250 kW Models
DC Output Bus
Models Rated 50 Vdc and Below
DC Output Bus
Models Rated 60 Vdc through 1000 Vdc
DC Output Bus
Models Rated Greater than 1000 Vdc

Integrated Options Available

High Isolation Output

Available for models rated for 250 Vdc to 1000 Vdc, the +ISO option greatly increases the output isolation, used when the application demands floating or tying units in series beyond the standard ±1000 Vdc output isolation rating.

High Slew Rate Output

The high slew rate output option is a hardware and control modification that replaces the standard output stage with one of low capacitance film and/or high RMS current rated aluminum electrolytic capacitors. This options provides higher bandwidth with faster output rise and fall times.


This option provides an integrated IEEE-488 GPIB communications port, allowing the product to be fully controlled and monitored using supported commands, as well as adding some additional interface specific commands.

Integrated Blocking Diode

The Integrated Blocking Diode Option provides an internally heatsinked protection diode on the positive output terminal of a MagnaDC programmable DC power supply to protect the product's output from reverse voltage up to 1200 Vdc.

LXI TCP/IP Ethernet

This option provides an integrated TCP/IP Ethernet communications port, allowing the product to be fully controlled and monitored using supported commands, as well as adding some additional interface specific commands.

Photovoltaic Power Profile Emulation

This software interface for Magna-Power programmable DC power supplies utilizes EN50530 modeling to generate and transfer non-linear solar array profiles as a function of temperature and sunlight for the power supply to emulate.

Accessories Available

Name Item Description Docs
USB Edgeport Converter 25302 Industrial Plug and Play USB to RS232 Converter N/A
RS485 Converter 24716 Industrial RS232 to Addressable RS485 Converter N/A
UID47: Universal Interface Device 22026 Master-slave interface device for load sharing. Includes interface device and (2) D-Sub 37 cables. PDF


White Papers

An Overview of Current-Fed Power Processing

A technical paper on Magna-Power Electronics signature current-fed power processing topology with a comparison to alternative approaches to high-power switch-mode power supply design.

Control Loop Modulation Applied to Programmable DC Power Supplies

Modulation allows a set point adjustment of voltage or current by another input. Modulation signals can be derived from an external device, such as a thermistor, or from sampling output current or voltage.

Getting the Best Performance from AC to DC Power Supplies in Abusive Environments

Five frequently seen power supply integration problems that may affect the product's lifespan and measures for correcting them, including: power supply grounding, line voltage, switching remote sense leads, over current trip fault, and operating environment.

Peak-to-Peak Output Voltage Measurements of Switching Power Supplies

The peak-to-peak output voltage measurement requires a setup that is difficult for customers to replicate. This article explores the methods and physical apparatuses used by Magna-Power to measure peak-to-peak output voltage ripple.

Current-Fed Power Processing—Ride Through Robustness

Magna-Power’s design philosophy focuses on developing power circuits capable of riding through potentially damaging conditions. This article explores this design philosophy in more detail, along with the company's MagnaDC power supply's signature current-fed power processing.
MT Series Programmable DC Power Supply Image

How to Buy

In the USA and Canada, Magna-Power sells it products directly from the factory, with a North American network of technical representatives. Magna-Power products are available worldwide through direct sales offices and authorized distributors. Requests from this form will either be quoted directly or automatically routed to the appropriate sales partner for quote.


Magna-Power products are made-to-order with build-times that vary depending on the model's maximum power rating. The current build-time for the MT Series is 6-8 weeks.

Sales Partners

In the USA and Canada, Magna-Power sells it products directly from the factory, with a nationwide network of technical representatives. Magna-Power products are available available worldwide through direct sales offices and authorized distributors. Requests from this form will either be quoted directly or automatically routed to the appropriate sales partner for quote.

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