MagnaLOAD Logo

ALx 시리즈

DC Electronic Load

The ALx Series MagnaLOAD utilizes conventional linear MOSFET-based dissipative elements, allowing the series to achieve a very wide voltage-current operating range within the model’s maximum power rating. Using the same heat management innovations developed for Magna-Power’s high density programmable DC power supplies, the ALx Series’ conservative cooling ensures long product life with continuous full power operation in environments up to 50°C ambient operating temperature.

Build-Time: 10-12 Weeks

CE Mark Logo TUV Logo UKCA Logo
ALx Series image
Magna-Power Expert

Talk with an expert

Our applications engineers are here to help!

ALx Series Digital Control Image

MagnaLINK™ Distributed Digital Control

Magna-Power’s MagnaLINK™ technology provides distributed Texas Instrument DSP control across power processing stages inside the MagnaLOAD DC electronic load. This technology follows a significant internal development cycle from Magna-Power to provide a unified digital control platform across its electronic loads and power supplies, featuring fully digital control loops, adjustable control gains, programmable slew rates, digital master-slaving, and many new advanced control technologies.

All ARx Series MagnaLOADs come with the following interfaces:

  • Front panel knob, keypad, and menu system
  • 25-pin configurable external user I/O, including a high-speed analog input
  • Front and rear USB and rear RS-485 or optional Ethernet and IEEE-4888 GPIB

When in standby or diagnostic fault, the DC input bus is disconnected via a switching device.

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.

Five Operating Modes

To accommodate a variety of DC sources, all ARx Series MagnaLOADs come with many configurable control modes, including:

  • Voltage Mode
  • Current Mode
  • Power Mode
  • Resistance Mode
  • Shunt Regulator Mode

Preference for DC regulation is given to the parameter in the selected mode within the programmed set-points. Using the MagnaLOAD's set-points and trip settings, the product can configured to either trip with a fault when a limit is exceeded or to cross-over into a different regulation state.

Shunt Regulator Mode turns the MagnaLOAD into a high-speed smart braking resistor, engaging the DC input only when a specified voltage and exceeded by a user-defined percentage, while limiting the shunt current to a programmed set-point.

ALx Series Operating Modes Image

Configurable External User I/O

Beyond the front panel and computer controls, all MagnaLOADs come standard with a 25-pin D-Sub connector designated as the External User I/O. This connector provides:

  • 8 Digital Outputs
  • 4 Digital Inputs
  • 4 Analog Outputs
  • 4 Analog Inputs

All the analog-digital I/O ports are configurable, allowing the user to select which parameters they want to control and monitor. This configurable I/O scheme reduces complexity, eases PLC integrationand allows control parameters from various interfaces simultaneously.

The MagnaLOAD's configurable analog inputs provide 0-10V programming from PLCs and external D/A converters.

ALx Series External User I/O Image
ALx Series Digital Master-Slaving Image

Digital Master-Slaving: Expandibility Without Compromise

All MagnaLOADs come standard with a MagnaLINK™ Input and a MagnaLINK™ Output port, which provides plug and play digital master-slaving. Simply connect the master's MagnaLINK™ Output to the slave's MagnaLINK™ Input and, using the MagnaWEB software, the products will automatically configure themselves for master-slave operation as a higher-power unit based on the populated ports. Buffered digital MagnaLINK™ connections means many MagnaLOADs can be daisy-chained in master-slave operation. Master-slave MagnaLOAD units will aggregate measurements to one display panel.

The internal MagnaLINK™ protocol was developed with expandability at the forefront. When configured for master-slave operation, the master controller takes control of all the slave's digital "targets." With this digital master-slaving strategy, it is completely transparent whether the unit is operating as a stand-alone product or in master-slave.

ALx Series MagnaWEB Software Image

MagnaWEB Software Interface

Magna-Power's next generation software interface, MagnaWEB, provides intuitive and user-friendly web-browser based controls for programming and measurement read-back of the MagnaLOAD's activity. Virtually all of the MagnaLOAD's available functions can be controlled and monitored from the MagnaWEB software over any of product's installed communication interfaces.

MagnaWEB uses a server-client software model to provide access to the MagnaLOAD from nearly any device and operating system. Install and run the MagnaWEB software locally on Windows then, using a web browser, access the server connected to the MagnaLOAD from a variety of devices including other desktops, tablets or smart-phones.

Front Panel - Standard

Front Panel - Standard

Front Panel - Blank Panel (+BP) Option

Front Panel - Blank Panel (+BP) Option
START: Enables the DC input bus
STOP: Disables the DC input bus
Voltage measurement display
Current measurement display
4-line character display featuring a menu system, operating status and modes, product messages with diagnostic codes, resistance measurement display, and power measurement display
Control power switch, energizes the control circuits without engaging DC bus
LED indicator that the DC input is enabled
Full control (host) front panel USB port
Clean air intake, with integrated fans
Aluminum digital encoder knob for programming set-points
LED indicator of the MagnaLOAD's present regulation state, which can include: constant voltage (CV), constant current (CC), constant power (CP), or constant resistance (CR)
Selector buttons to choose which set-point the digital encoder knob and digital keypad buttons will modify
MENU: Enters the menu system on the 4-line display
BACK: Moves back one level in the menu
ENTER: Selects the highlighted menu item
CLEAR: Removes the product from a faulted state
LOCK: Locks the front panel, with password protection available

Model Ordering Guide

Model Ordering Guide

There are 27 different models in the ALx Series spanning power levels: 1.25 kW, 2.5 kW, 5 kW, 7.5 kW, 10 kW, 12.5 kW, 15 kW, 17.5 kW, 20 kW.

Use the following ordering guide and models chart to define the best model for your application.

ALx Series Ordering Guide

ALx Series Models

There are 27 different models in the ALx Series spanning power levels: 1.25 kW, 2.5 kW, 5 kW, 7.5 kW, 10 kW, 12.5 kW, 15 kW, 17.5 kW, 20 kW. To determine the appropriate model:

  1. Select the desired Max Voltage (Vdc) from the left-most column.
  2. Select the desired Max Current (Adc) from the same row that contains your desired Max Voltage.
  3. Construct your model number according to the model ordering guide.
Model Maximum Power Maximum Voltage Maximum Current Package Type Minimum Voltage
ALx1.25-200-300 1.25 kW 200 Vdc 300 Adc Rack-mount 2.5 Vdc
ALx1.25-500-125 1.25 kW 500 Vdc 125 Adc Rack-mount 6.0 Vdc
ALx1.25-1000-37.5 1.25 kW 1000 Vdc 37.5 Adc Rack-mount 7.5 Vdc
ALx2.5-200-600 2.5 kW 200 Vdc 600 Adc Rack-mount 2.5 Vdc
ALx2.5-500-250 2.5 kW 500 Vdc 250 Adc Rack-mount 6.0 Vdc
ALx2.5-1000-75 2.5 kW 1000 Vdc 75 Adc Rack-mount 7.5 Vdc
ALx5-200-1200 5 kW 200 Vdc 1200 Adc Floor-standing 2.5 Vdc
ALx5-500-500 5 kW 500 Vdc 500 Adc Floor-standing 6.0 Vdc
ALx5-1000-150 5 kW 1000 Vdc 150 Adc Floor-standing 7.5 Vdc
ALx7.5-200-1800 7.5 kW 200 Vdc 1800 Adc Floor-standing 2.5 Vdc
ALx7.5-500-750 7.5 kW 500 Vdc 750 Adc Floor-standing 6.0 Vdc
ALx7.5-1000-225 7.5 kW 1000 Vdc 225 Adc Floor-standing 7.5 Vdc
ALx10-200-2400 10 kW 200 Vdc 2400 Adc Floor-standing 2.5 Vdc
ALx10-500-1000 10 kW 500 Vdc 1000 Adc Floor-standing 6.0 Vdc
ALx10-1000-300 10 kW 1000 Vdc 300 Adc Floor-standing 7.5 Vdc
ALx12.5-200-3000 12.5 kW 200 Vdc 3000 Adc Floor-standing 2.5 Vdc
ALx12.5-500-1250 12.5 kW 500 Vdc 1250 Adc Floor-standing 6.0 Vdc
ALx12.5-1000-375 12.5 kW 1000 Vdc 375 Adc Floor-standing 7.5 Vdc
ALx15-200-3600 15 kW 200 Vdc 3600 Adc Floor-standing 2.5 Vdc
ALx15-500-1500 15 kW 500 Vdc 1500 Adc Floor-standing 6.0 Vdc
ALx15-1000-450 15 kW 1000 Vdc 450 Adc Floor-standing 7.5 Vdc
ALx17.5-200-4200 17.5 kW 200 Vdc 4200 Adc Floor-standing 2.5 Vdc
ALx17.5-500-1750 17.5 kW 500 Vdc 1750 Adc Floor-standing 6.0 Vdc
ALx17.5-1000-525 17.5 kW 1000 Vdc 525 Adc Floor-standing 7.5 Vdc
ALx20-200-4800 20 kW 200 Vdc 4800 Adc Floor-standing 2.5 Vdc
ALx20-500-2000 20 kW 500 Vdc 2000 Adc Floor-standing 6.0 Vdc
ALx20-1000-600 20 kW 1000 Vdc 600 Adc Floor-standing 7.5 Vdc


The following specifications are subject to change without notice. Unless otherwise noted, all specifications measured at the product's maximum ratings.

AC Input Specifications
Specification Value
AC Input Voltage

1Φ, 2-wire + ground
100-240 Vac (UI: Universal Input); Available on 1.25 to 17.5 kW Models
200-240 Vac (UI2: Universal Input 2); Available on 20 kW Models
AC Input Frequency
50-60 Hz
AC Input Isolation
±1500 Vac, maximum input voltage to ground
Programming Interface Specifications
Specification Value
Front Panel Programming
Aluminum rotary knob with encoder, keypad, or up-down arrow for single bit control
Computer Interfaces

USB Host (Front): Type B
USB Host (Rear): Type B
RS485 (Rear): RJ-45
MagnaLINK™: RJ-25 x 2
Computer Interfaces
LXI TCP/IP Ethernet (Rear): RJ-45
GPIB (Rear): IEEE-488
External User I/O Port

Analog and Digital Programming
25-pin D-sub DB-25, female
Referenced to Earth ground; isolated from the DC input
See User Manual for pin layout
Programming Specifications
Specification Value

All Modes
16-bit, 0.0015%

Programming and Measurement
Voltage: ±0.1% of full scale voltage rating
Current: ±0.2% of full scale current rating
Power: ±0.3% of full scale power rating
Resistance: ±0.3% of full scale resistance rating
Rise/Fall Time

Voltage Mode: 100 ms, 10% to 90% full scale voltage rating
Current Mode: 2 ms, 10% to 90% full scale current rating
Power Mode: 100 ms, 10% to 90% full scale power rating
Resistance Mode: 200 ms, 10% to 90% full scale resistance rating
Trip Settings Range
Programmable protection limits used to trigger a soft fault shutdown in the event the limit is exceeded by the DC source
Over Voltage: 10% to 110% of full scale voltage rating
Under Voltage: 0% to 110% of full scale voltage rating
Over Current: 10% to 110% of full scale current rating
Over Power: 10% to 110% of full scale power rating
External User I/O Specifications
Specification Value
Digital I/O
Digital Input Voltage: 5V
Digital Input Impedance: 10 kΩ
Digital Monitoring Voltage: 5V, 32 mA capacity
Digital Reference Voltage: 5V, 20 mA capacity
Analog I/O
Analog Sampling Rate: 2 kHz
Analog Programming Voltage: 0-10 V
Analog Programming Resolution: 12-bit, 0.025%
Analog Monitoring Voltage: 0-10 V, 3 mA capacity
Analog Monitoring Impedance: 0.005 Ω
Analog Monitoring Accuracy: 0.05% of full scale
Analog Reference Voltage: 10 V, 20 mA capacity
Physical Specifications
Specification Value
Racking Standard

1.25 kW and 2.5 kW Models Only
Size and Weight

1.25 kW Models
5.25” H x 19” W x 24” D (13.34 x 48.26 x 60.96 cm)
40 lbs (18.1 kg)
Size and Weight

2.5 kW Models
5.25” H x 19” W x 24” D (13.34 x 48.26 x 60.96 cm)
65 lbs (29.5 kg)
Size and Weight

5 kW Models
12U Cabinet
30.7” H x 24” W x 31.5” D (78.0 x 61.0 x 80.0 cm)
255 lbs (115.7 kg)
Size and Weight

7.5 kW Models
12U Cabinet
30.7” H x 24” W x 31.5” D (78.0 x 61.0 x 80.0 cm)
320 lbs (145.2 kg)
Size and Weight

10 kW Models
12U Cabinet
30.7” H x 24” W x 31.5” D (78.0 x 61.0 x 80.0 cm)
385 lbs (174.6 kg)
Size and Weight

12.5 kW Models
24U Cabinet
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
500 lbs (226.8 kg)
Size and Weight

15 kW Models
24U Cabinet
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
565 lbs (256.3 kg)
Size and Weight

17.5 kW Models
24U Cabinet
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
630 lbs (285.8 kg)
Size and Weight

20 kW Models
24U Cabinet
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
695 lbs (315.3 kg)
Environmental Specifications
Specification Value
Ambient Operating Temperature
0°C to 50°C
Storage Temperature
-25°C to +85°C
Relative humidity up to 95% non-condensing
Air Flow
Front air inlet, rear exhaust
Regulatory Specifications
Specification Value
Complies with 2014/30/EU (EMC Directive)
CISPR 22 / EN 55022 Class A
NRTL Listed, TÜV SÜD Certificate U8 123461 0002
Tested to UL 61010-1:2012/R:2019-07 and CSA C22.2 No. 61010:2012/A1:2018-11
Complies with EN61010-1 and 2014/35/EU (Low Voltage Directive)
CE Mark
RoHS Compliant

Options and Accessories

The following are options and accessories developed specifically for Magna-Power's ALx Series


External accessories and integration services are available for Magna-Power products


The following downloads are for the ALx 시리즈:


ALx Series User Manual [EN] [HTML] [Recommended]
ALx Series Datasheet [1.4.0] [EN] [PDF]
ALx Series Datasheet [1.4.0] [ZH] [PDF]



MagnaWEB Software [0.043] [MSI]
MagnaCTRL Software [0.004-52692] [MSI]