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RL Series Resistive-Reactive Load Banks

Resistive Reactive Load Bank

A robust, resistive/ inductive, high capacity load bank ready for the great outdoors.

High Capacity  *  300 kVA to 1875 kVA

Ideal for testing and maintenance of large AC power systems at rated kVA

Weatherized & Self Contained

Built for harsh environments, the RL Series has a modular design with isolated resistive and reactive loads
The RL Series Resistive-Reactive Load Banks offers a 0.80 power factor load and is designed for testing large generators, switchgear, transformers and UPS systems. The structural skid with fork lift pockets allows for portability and is ideal for shipyards, power plants, OEMs and data centers. The RL Series is the perfect solution for regularly scheduled maintenance testing and commissioning of mission-critical standby emergency power systems where rated kVA, rated power factor and rated current testing is required.

Inductive Load Elements | Reliable Every Time

The load inductors are iron core, copper wound, air-gap calibrated and are rated for continuous duty. RL Inductors are conservatively designed to minimize power factor and waveform distortion. Each load inductor coil is air cooled and thermally protected with thermal switches embedded within each coil winding. Inductors are treated with a highly durable VPI epoxy process and oven-cured for maximum reliability. The inductor load enclosure is constructed from heavy gauge steel with an independent ventilating system, and is interconnected to the resistive load through a sealed bus raceway. The load inductors are securely mounted to the structural base and are field replaceable.

PowerDyne™ Resistive Load Elements | When Quality Matters

PowerDyne™ Resistors are the most rugged in the industry and can handle the rigors of transit vibration and continuous testing.  They are fully supported across their entire length within the air stream by stainless steel support rods which are insulated with heavy-duty, high-temperature ceramic insulators. Change in resistance is minimized by maintaining conservative resistor designs. 

Construction | Built to Last 

The RL Series enclosures are constructed of galvanized steel with the highest quality durable powder-coat paint finish, and external stainless steel fasteners. All power, motor, and control connections are provided in a sealed thermostatically controlled heated compartment to limit any harmful effects of moisture and condensation. The enclosure is stationary-type, outdoor construction, to be installed and operated on a floor, roof-top, or concrete pad.  Forklift channels are provided within the base for ease of lifting and handling during installation. 

Load Bank Control Power

External 120 Volt AC, 1-phase, 60 Hertz power is required for control circuit operation.  When 120 VAC control power is not readily available, units can be provided with an optional internal control power transformer.

Automatic Load Dump

This circuit provides user interface provisions to the generator controls, automatic transfer switch, or building management system, to disconnect and disable all load steps from a normally closed (NC) set of auxiliary contacts.  In the event of an actual power failure, all load bank load is removed from the source under test.

Resistive Reactive

Digital Power Meter (Optional)

A fully equipped, 3-phase Digital Power Metering System that measures a standard range of 16 load parameters. Includes RS485 (Modbus protocol) for remote reading - compatible with PC, PLC, and data loggers.

Operator Protection | When Safety Matters

The RL Series Load Bank comes equipped with a remote control panel (with enclosure) and includes an Emergency-Stop push button allowing the operator to take the unit off-line should a critical hard-stop condition occur.  Branch circuit fuse protection provides short-circuit fault protection of all load bank steps eliminating the potential for catastrophic failure.  Blower On, Motor Overload, Air-Flow Failure, and Over-temperature circuits disable all load steps during a fault condition with operator visual indicators.  The Load Dump circuit provides the operator visual indication if all load steps have been removed.

Load Bank Operator Controls

  • Emergency Stop (E-Stop)
  • Illuminated Main Power On/Off switch
  • Illuminated Blower Start/Stop Switch
  • Master Load On/Off switch
  • Individual Load Step Switches
  • Fault condition smart indicators provide operator display and load disconnect during Air-Flow Failure, Over-temperature, Motor Overload, and Load Dump

side viewside view

Load Bank Cooling System

  • Integrally mounted blower motor(s) with high-performance, direct-driven fan blade delivers the required airflow volume (CFM) for cooling resistor load elements
  • Blower motors can be wired to operate internally off the main input load bus from the power transformer or independently from an external 3-phase power source
  • Motor circuits are short-circuit protected by current-limiting fuses and thermally protected by overload relays

Resistive Reactive


Standard Capacities

kVA @ 0.80 pf  kW  kVAR
300 240 180
500 400 300
750 600 450
1250 1000 750
1500 1200 900
1875 1500 1125

Standard Voltages

480 Volts AC, 3-Phase, 60 Hertz
600 Volts AC, 3-Phase, 60 HertzL1034 3


3.75 kVAR/ 5 kW


Side intake, vertical discharge                                                

Power Wiring

150C insulated, EPDM

Power Connection

Direct to plated bus bar

RL Series Resources

Sales Brochure RL Series

Outline Drawing 1250-1875 kVA

Your Complete Solutions Provider | When Testing Matters

LBD’s complete line of portable and stationary Load Bank products offers industry exclusive load testing solutions for generator set dealer/distributor networks, service arms, rental companies, end users, and original equipment manufacturers of generator sets, UPS systems, turbines, fuel cells, wind power,  and battery systems.  LBD is your factory-direct complete solutions partner.