Regenerative AC/DC Load Simulator RLS Series

Regenerative Load Simulator in 4 Quadrant Operation

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Regenerative AC/DC Loads > 90% Energy Efficiency

The Regenerative Load Simulator – RLS Series is compact with high-power density, providing 6kVA/kW up to 21kVA/kW in a 4U chassis. Parallel up to 168kVA/kW in a single 19” cabinet or dual cabinets up to 252kVA/kWRegenerative power is greater than 90% energy efficiency with sink and source capabilities returning energy back to the facility or grid. 

AC/DC Load Applications

The Regenerative Load Simulator RLS Series simulates almost any AC and DC load waveforms.

Test applications: Utility grid, microgrid, EV chargers, EVSE, Vehicle-to-Grid (V2G), Vehicle-to-Home (V2H), Solar PV/grid-tied inverters, home energy storage systems, UPS, PDUs, AC power sources, DC power supplies, and more.

Seamless Load Simulation with Constant Power Voltage Range

Accurately simulate AC/DC loads with seamless transition of voltage ranges. A single constant power voltage range for both higher current at lower voltage and higher voltages at lower currents eliminating the need to switch between voltage ranges. This prevents potential disruptions in output power.

Regenerative Load Simulator Constant Power Voltage Range V-I Profiles AC Mode All Models Q1 Quadrant

Fully Test AC or DC Power with 4 Quadrant Load

4 Quadrant AC DC Regenerative Load - Lagging Current

Ultra-Flexible AC/DC Load Simulation Capabilities

Simultaneous AC and DC load operation of modes per phase(or channel), and the automatic switching of input modes provides test engineers with a unique capability and the highest degree of flexibility. AC, DC input configurations are available in single, split, three phase and multi-channels with optional isolated neutrals in AC and DC.

Full galvanic isolation from facility AC input to load input and between input phases/channels also protects the user and the UUT.  

Flexible AC DC Input Configurations

Easily Generate Harmonics & Inter-Harmonic Waveforms

The Regenerative Load Simulator – RLS Series has a built-in waveform digitizer and scope with fast transient capabilities at 200us time resolution supporting LIST, PULSE and STEP modes.  Waveform generation includes ten Standard, Sine, Square, Triangle, Clipped and Harmonics (inter-harmonics option) generation.

Regenerative AC Power Source Program Transients

Several AC/DC Load Emulation Modes

Regenerative AC/DC Electronic Load capability with both AC and DC operating modes pushes the boundaries of your test environment. Simulate linear and non-linear loads (including rectified), inductive and capacitive loads.

  • AC Modes: Constant Current, Constant Power & Apparent Power, Constant Resistance, Constant Voltage, CC+CR, CC / CS Rectifier Mode 1ø & 3ø
  • DC Modes: Constant Current, Constant Power, Constant Resistance, Constant Voltage, CR+CC
AC and DC Load Emulation Modes-2

Simplify Testing with SmartSource Suite Remote Control Platform

Built-in SmartSource Suite Remote Control Platform

Pacific Power Source’s SmartSource Suite provides full remote control, development, and execution of test sequences in real-time. 

Intelligently monitor, control, and manage testing using the intuitive embedded web browser interface on any mobile device. 

SmartSource Suite Test Program Web Interface

Models Table

Model Rated Power (VA) Output Form Voltage Ranges
Current 2
Input power form (3) rack height
Bench or Rack Mount Models
360RLS 6000 1,2,3 Ø 350 (L-N)/
16.7 / 8.3 4U
390RLS 9000 1,2,3 Ø 350 (L-N)/
25.0 / 12.6 4U
3120RLS 12000 1,2,3 Ø 350 (L-N)/
33.3 / 16.7 4U
3150RLS 15000 1,2,3 Ø 350 (L-N)/
41.7 / 21.0 4U
3180RLS 18000 1,2,3 Ø 350 (L-N)/
41.7 / 21.0 4U
3210RLS 21000 1,2,3 Ø 350 (L-N)/
41.7 / 21.0 4U
Model Rated Power (VA) Output Form Voltage Ranges
Current 2
Input power form (3) rack height
Parallel Systems
3240RLS-4 24000 2,3 Ø 350 (L-N)/
66.7 / 33.3 15U
3300RLS-4 30000 2,3 Ø 350 (L-N)/
83.3 / 42.0c 15U
3360RLS-4 36000 2,3 Ø 350 (L-N)/
83.3 / 42.0 15U
3420RLS-4 42000 2,3 Ø 350 (L-N)/
83.3 / 42.0 15U
3630RLS-4 63000 2,3 Ø 350 (L-N)/
125.0 / 62.5 15U
3840RLS-4 84000 2,3 Ø 350 (L-N)/
166.7 / 83.3 28U
31050RLS-4 105000 2,3 Ø 350 (L-N)/
208.3 / 104.0 28U
31260RLS-4 126000 2,3 Ø 350 (L-N)/
249.9 / 125 28U
31470RLS-4 147000 2,3 Ø 350 (L-N)/
291.6 / 146 40U
31680RLS-4 168000 2,3 Ø 350 (L-N)/
333.3 / 167 40U


Key Features

Regenerative Power Over 90% Energy Efficiency

RLS Series Operating Features

AC/DC Electronic Load:

The programmable AC or DC electronic load has 4-Quadrant capability so both true and apparent power can be drawn with programmable control over power factor, current crest factor, current waveshape etc.

Instead of dissipating the energy received from the unit under test, the RLS load returns up to 90% of the absorbed energy back to the grid.

Time and Cycle Based Transients:

Create and execute transients that occur over a specified time segment or number of cycles to modify the output waveform, voltage, and frequency for any or all phases. An output trigger is provided for synchronizing external test equipment to the actual transient event.

Easy to Use, Multiple Control Options

The RLS Series controller offers both manual and full programmable control.
  • Intuitive Menu and Soft-key Driven Operation
  • LCD Color Screen Touch Panel
  • Shuttle Knob, Numeric Entry Pad
  • LAN, GPIB, RS232 & USB Interfaces, ModBus (Optional)
  • Supports external touch screen via Video output/USB connections
  • SmartSource Suite – Embedded Web Server for Both LAN and USB Interface

Continuous Self Calibration:

Provides exceptional accuracy of the AC or DC output Voltage. When enabled, accuracy improves to ±0.02% referenced to the power source internal voltmeter.

Extensive Waveform Library:

Up to 200 different waveforms can be stored in the waveform library for execution as part of a steady state program or for substitution in any output phase as part of a transient test program. Memory location #1 is a non-editable high resolution sine wave. Locations 2 and higher are editable and can be substituted in any output phase. Store unlimited number of waveforms on the computer using the SmartSource Suite web browser interface.

Phase Conversion:

With the ability to provide single, split and three-phase outputs, the RLS Series is the perfect choice to provide 1 Phase to 2 or 3 Phase or 3 Phase to 1 Phase conversion.

Safety Features & Protection Limits:

Full galvanic isolation protects the user and UUT. Enhanced protection modes are includes programmable  limit protection modes for real power, apparent power, over voltage and over temperature.

Cooling & Energy Savings Mode:

Front forced air intake with rear exhaust. Automatic Fan Speed Control for low acoustic noise and extended fan life.

The Energy Saving Sleep Mode result in low power consumption during idle periods and extends the product life.

Protective Transit Cases for Mobile Applications

Pacific Power Source offers rugged transit cases to protect your AC Source from adverse environmental conditions for mobile and/or military applications.

Specific Benefits:

Cases available for the following models:

5U Size Case: 360RLS, 390RLS, 3120RLS, 3150RLS, 3180RLS, 3210RLS


Power Source Specifications

Input Frequency:

DC, 15 to 1200 Hz

DC Voltage Input Range:

0 – 500 Vdc Constant Power Mode.

Load Modes:

Load: AC, DC

Phase Forms:

Single (1), Split (2) and Three Phase (3) Forms Dual, Tripple, 2+1 Forms

AC Voltage Input Range:

30 – 350 Vrms L-N / 0-606 Vrms L-L

Mechanical Specifications

All RLS models are designed for operation in 19-inch equipment racks. Models above 21 kVA require parallel operating of one RLS Master unit and one or more auxiliary no-controller (NC) units. Models 3300RLS through 310500RLS are available as cabinet systems with all internal input and output wiring, terminal blocks and parallel connections included.


Standard 19 inch rack. Slide rails are available as an option for all RLS units.


See model table for panel or cabinet height.


Approximately 25 inch, from the front panel to the rear of the chassis.


Front forced air intake with rear exhaust. Automatic Fan Speed Control for low acoustic noise and extended fan life.

The Energy Saving Sleep Mode result in low power consumption during idle periods and extend the life of the product.

Expanding the AC / DC Loads into an Automated Test System

Pacific’s line of SmartRegen® AC/DC electronic loads enables engineers to easily automate their testing by using industry standard software development environments. The RLS series offers standard Ethernet/LAN connectivity, a browser interface, LXI compliance (LAN extensions for Instruments) to ensure inter-operability with other LXI instruments and IVI (Interchangeable Virtual Instrument) driver to speed up ATE test program development.


Electronic Load Mode Applications:

This AC or DC electronic programmable AC or DC load with 4-Quadrant capability simulates realistic test scenarios with energy efficiency. The load simulator offers a complementary solution for testing AC products, the utility grid, microgrid, EV chargers, Vehicle-to-Grid (V2G), Vehicle-to-Home (V2H), Solar PV/grid-tied inverters, home energy storage systems, UPS, PDUs, and more. Other applications include Electric Vehicle bidirectional on-board chargers (OBC), DC-DC converters between the HV battery and 12Vdc or 48Vdc subsystems. In DC mode, load mode is available to sink DC current for battery discharging or for testing regenerative breaking subsystems.

Brochures & Manuals

Product Brochure:

Download brochure to review product details.

Technical and Application Assistance: