

Key Facts
- 27 models
- 1.25 kW to 20 kW power levels
- Up to 1000 Vdc output voltage
- Up to 4800 Adc output current
- MagnaLINK™ Distributed DSP Architecture
- 16-bit resolution
- Digital master-slaving with aggregation
- SCPI programming API
- UL/CSA listed, CE Mark
- Designed and manufactured in the USA
Wide Full Power Operating Range Linear MOSFET Electronic Load
High Current Capability, UL/CSA Listed, and Many Control Modes Available
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. The ALx Series provides 16-bit precision in voltage, current, resistance, and power control modes, along with a shunt regulator mode, to act as a "smart" braking resistor to protect devices on the DC bus.
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.
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.
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.
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.

Models
Choose from 27 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.
Use the following ordering guide and models chart to define the best model for your application.
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 |
Specifications
Technical Product Data
120 Vac (120SP: operating range 108 to 132 Vac); Available on 5 kW to 17.5 kW Models
208 Vac (208SP: operating range 187 to 229 Vac); Available on 5 kW to 20 kW Models
240 Vac (240SP: operating range 216 to 264 Vac); Available on 5 kW to 20 kW Models
USB Host (Rear): Type B
RS485 (Rear): RJ-45
MagnaLINK™: RJ-25 x 2
GPIB (Rear): IEEE-488
Referenced to Earth ground; isolated from the DC input
See User Manual for pin layout
Current: ±0.2% of full scale current rating
Power: ±0.3% of full scale power rating
Resistance: ±0.3% of full scale resistance 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: 40 ms, 10% to 90% full scale resistance 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
Digital Input Impedance: 10 kΩ
Digital Monitoring Voltage: 5V, 32 mA capacity
Digital Reference Voltage: 5V, 20 mA capacity
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
5.25” H x 19” W x 24” D (13.34 x 48.26 x 60.96 cm)
40 lbs (18.1 kg)
5.25” H x 19” W x 24” D (13.34 x 48.26 x 60.96 cm)
65 lbs (29.5 kg)
30.7” H x 24” W x 31.5” D (78.0 x 61.0 x 80.0 cm)
255 lbs (115.7 kg)
30.7” H x 24” W x 31.5” D (78.0 x 61.0 x 80.0 cm)
320 lbs (145.2 kg)
30.7” H x 24” W x 31.5” D (78.0 x 61.0 x 80.0 cm)
385 lbs (174.6 kg)
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
500 lbs (226.8 kg)
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
565 lbs (256.3 kg)
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
630 lbs (285.8 kg)
58.25” H x 24” W x 31.5” D (148.0 x 61.0 x 80.0 cm)
695 lbs (315.3 kg)
CISPR 22 / EN 55022 Class A
Conforms to UL61010-1:2012 Ed.3+R:29Apr2016
Certified to CSA C22.2#61010-1-12:2012 Ed.3
Complies with EN61010-1 and 2014/35/EU (Low Voltage Directive)
Options and Accessories
Available for the ALx Series
Request a Quote
Get ALx Series product pricing
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.
Build-time
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 ALx Series is 4-6 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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