3C Series AC & DC Loads


The 3C Series AC & DC loads comprises a range of medium to high power AC and DC capable load systems with support for up to 300V AC and 500V DC input voltages.

All 3C Series model loads share a common, modern user interface. Packaged in a compact 19” 4U chassis, 3C Series loads support up to 3750 VA/W per chassis. For higher power requirements, 3C Series load can be paralleled using their standard Master/Slave mode. to support power levels up to 11.25kVA/kW or 33.75kVA/kW for three phase applications. Master/Slave configurations are controlled from the master front panel or remote control interface.  Rack mountable versions of the 3C with one master and two or three slaves are available as well for these power level requirements.

For questions regarding the 3C Series AC Loads, please contact us.


The Adaptive Power 3C Series loads are intended for medium to high power AC or DC test and product development applications in a wide range of industries. The 3C Series models support voltages to 350Vrms in AC mode and 500Vdc in DC mode. They are ideally suited for testing AC Sources and DC/AC inverters. Their flexible V-I operating curves span range of voltage and current combinations at any given power level. All 3C Series models have a low range mode for enhanced accuracy and resolution at lower voltage and current levels, further increasing their effectiveness.  This series includes application specific test modes for UPS testing, Battery Testing and PV Inverter testing to speed up production throughput.

The 3C Series consists of three different rack mount  models up to 3750VA/W per 19″ chassis and can be paralleled up to 11.25kVA/kW per phase for higher power requirements. Cabinet models are available as well in power ratings of 7500VA/W and 11,250VA/W.


MODELDESCRIPTIONMax Power (VA or W)Max Voltage (V)Max Current (A)Rack Height
3C018-18AC&DC Electronic Load1875350Vac / 500Vdc18.754U
3C028-28AC&DC Electronic Load2800350Vac / 500Vdc28.04U
3C038-38AC&DC Electronic Load3750350Vac / 500Vdc37.54U
Auto Parallel up to 3 Loads
3C075-75AC&DC Electronic Load7500350Vac / 500Vdc758U
3C112-112AC&DC Electronic Load11250350Vac / 500Vdc112.512U


  • 1875VA/W to 3750VA/W per Chassis
  • Up to 11,250VA/phase when paralleled
  • Master/Slave models at 7500VA/W and 11,250VA/W
  • Voltage Range, 350Vac, 500Vdc
  • Frequency Range: DC, 40Hz ~ 440Hz
  • Current Ranges up to 112.5A
  • Unique TURBO mode doubles current & power for overload testing
  • High-Speed 5½  Digit Precision Metering Capability
  • Parallel Operation for High Power Applications
  • Three phase Delta & Wye Master mode support
  • Current Monitor Output Signal
  • Operating Modes: Constant Current (CC), Linear Constant Current (LCC), Constant Resistance (CR) and Crest Factor (CF) control
  • Leading and Lagging Power Factor (PF) 0.0 to ±1.0
  • Built-in Test Modes: UPS, PV Inverter, Battery, AC rectifier
  • Over Current Protection Test Mode
  • Over Power Protection Test Mode
  • Conventional and Linear CC Modes
  • LAN, USB, RS232 or GPIB Interfaces
  • CE Mark


Load Versatility

All APS 3C Series Loads are equipped with a large high brightness Fluorescent display and functional keyboard. This makes these load very user-friendly. Built in modes and capabilities cover a wide range of special load applications. Enhanced precision metering of Voltage, Current, Power and Resistance compared to prior generation load models is standard.

AC Power Source Testing (AC Mode)

Elaborate testing of linear and switch mode AC Sources, DC/AC inverters or Frequency changers is made possible by flexible ranging and wide V-I operating curves found in all 3C Series APS loads. This supports extensive production test and burn-in of AC power supplies, UPS’s, PV inverters as well as fuse and breaker testing. Standard test modes for these types of tests are built-in the 3C load firmware so less programming and user involvement is required compared to traditional loads.

AC Power Source Design (AC Mode)

With built-in features like over current protection (OPC) test and over power protection (OPP) test and Power and Crest Factor control and non-sinusoidal waveform testing, new AC power source designs can be thoroughly evaluated against design specifications. An analog input mode allows arbitrary current waveforms to be applied to a unit under test.

AC?DC Converter and Power Supply Design  & Test (DC Mode)

The 3C Series load to double duty as fully capable DC loads as well so you are not stuck with wrong type load when it comes to testing AC/DC power supplies or DC/DC converter testing.

Battery Charge/Discharge Testing (DC Mode)

Using the DC load mode, specific discharge current levels can be set as a function of battery voltage. This allows characterization and performance testing of various battery chemistries.   Several AC/DC supplies and converters can be tested in DC mode as well. Special battery discharge protocols are built-in the load including SoC monitoring and timed discharges.


 4U Rack Mount Units
Model 3C018-18 3C028-28 3C038-38
Power Ranges 0 – 1875 VA/W 0 – 2800 VA/W 0 – 3750 VA/W
Current Ranges 0 – 18.75 A 56.25 Apk 0 – 37.5 A 84.0 Apk 0 – 18 A 112.5 Apk
Voltage Range 50-350 Vrms/50-500 Vdc 50-300 Vrms/50-500 Vdc 50-300 Vrms/50-500 Vdc
Frequency DC, 40 – 440Hz  (CC,CP Mode) / DC – 450Hz (LIN,CR,CV Mode)
OPERATING MODES Constant Current (CC), Linear CC (LIN), Constant Resistance (CR), Constant Voltage (CV), Constant Power (CP)
PROTECTION Over Power (OP), Over Current (OC), Over Voltage (OV), Over Temperature (OT)
Lagging PF CF: √2 to 5.0. PF: – 0.00 to -1.00
Leading PF CF: √2 to 5.0. PF: + 0.00 to +1.00
Voltage Range 0 – 500 V
Current Range 0 – 18.75 A 0 – 28.0 A 0 – 37.5 A
Power Range 0 – 1875 W 0 – 2800 W 0 – 3750 W
VA Range 0 – 1875 VA 0 – 2800 VA 0 – 3750 VA
Current Monitor 5.625 A/V 8.4 A/V 11.25 A/V
Dimensions (HxWxD) 177 x 440 x 513 mm
7.0″ x 17.32″ x 20.0″
Weight (Net, Module) 21.5kg / 47.4 lbs 27.5kg / 60.6 lbs 33.5kg / 73.9 lbs
8U and 12U Rack Mount Systems (wheels included)
Model 3C075-75 3C112-112
Power Ranges 0 – 7500 VA/W 0 – 11250 VA/W
Current Ranges 0 – 75 A 225 Apk 0 – 112.5 A 337.5 Apk
Voltage Range 50-350 Vrms/50-500 Vdc 50-300 Vrms/50-500 Vdc
Frequency DC, 40 – 440Hz  (CC,CP Mode) / DC – 450Hz (LIN,CR,CV Mode)
OPERATING MODES Constant Current (CC), Linear CC (LIN), Constant Resistance (CR), Constant Voltage (CV), Constant Power (CP)
PROTECTION Over Power (OP), Over Current (OC), Over Voltage (OV), Over Temperature (OT)
Lagging PF CF: √2 to 5.0. PF: – 0.00 to -1.00
Leading PF CF: √2 to 5.0. PF: + 0.00 to +1.00
Voltage Range 0 – 500 V
Current Range 0 – 75.0 A 0 – 112.5 A
Power Range 0 – 7500 W 0 – 11250 W
VA Range 0 – 7500 VA 0 – 11250 VA
Current Monitor 22.5 A/V 34.5 A/V
Dimensions (HxWxD) 458 x 480 x 593 mm
18.0″ x 18.9″ x 23.4″
636 x 480 x 593 mm
25.0″ x 18.9″ x 23.4″
Weight (Net, Module) 70 kg / 154.3 lbs 105 kg / 231.5 lbs


3C018-18 AC & DC Programmable Load - 1875W
3C028-28 AC & DC Programmable Load - 2800W
3C038-38 AC & DC Programmable Load - 3750W


Documentation, Technical and Application Assistance

Adaptive Power Systems’ seasoned sales and service team is here to help via email or a simple call.

You can also register to Access Our Online Technical Resources to download user manuals.


All 3C Series loads are supported by the APS AC&DC Load Control windows software.

Key Features:

  • Control all Load Settings and Functions
  • Supports 2 or 3 Phase Modes
  • Retrieve, Display and Store Measurement Data
  • Strip Chart display of all Load Measurements
  • Supports all APS AC Load Models
  • Save Setups for Quick Recall
  • Create, Save, Edit and Execute Auto Test Sequences
  • Develop Test Sequences Off-Line for later use
  • Windows 7 and Windows 8.1 Compatible
  • Multi-threaded Data Collection to Tab Delimited Text Files
  • Supports USB,  RS232, GPIB and LAN Interfaces
  • Built-in Simulation Mode
  • Simulation Mode Includes AC Sources

Sample GUI Screens:

DC Loads, Electronic Loads, Programmable Loads
AC Load Main Control Screen
DC Loads, Electronic Loads, Programmable Loads
DC Load Data Logging Screen
AC Loads, Electronic Loads, Programmable Loads
Crest Factor & Power Factory Library
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