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Simplex Neptune Trailer Load Bank (200-650kW)

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3,500.00 LBS

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The Simplex Neptune trailer-mounted load bank is designed for high capacity load testing of generators, periodic reliability exercise of standby generators, regenerative power absorption of inertial motors with reverse power protection of generators, and other load bank applications. The Neptune is a single or dual voltage load bank suitable for all common 60, 50, and 400 hertz voltages up to 600V.


  • Duty Cycle: Rated for continuous operation.
  • Digital Control: The Simplex D-Series Digital Controller is PLC-based, network capable, and comes with a local color TFT touch-screen operator interface (remote touch-screen also available - see Options below).
  • Instrumentation: Digital monitoring and data logging capabilities.
  • Load Elements: Elements mounted in easily accessible, slide out trays; Simplex Powr-Web chromium alloy, open wire, continuously supported, power resistor; UL recognized.
  • Cooling: Integral forced air cooling system; 3-phase, direct drive motor; Rain shedding exhaust hood; Forced air, vertical airflow -- cold air intake at bottom, hot air exhaust at top.
  • Malfunction Protection: Sensors, alarms (alarm messages and exhaust temperature displays on touch-screen), lock-outs as appropriate, for the following: fan failure, high exhaust temperature and high intake temperature.
  • Load Circuit Protection: branch circuit fuses. One set of fuses each 50KW branch. Fuses are current limiting type, 200,000 AIC, 600V, enabling safe use on large generating or UPS system.
  • Load Control: Branch circuit contactors each step or each 50KW circuit maximum; Contactors with enclosed silver surfaced contacts, 120V coils; electrically operated and electrically held.
  • Load Connections: Cam-type male power connectors.
  • Enclosure: Type 3R weatherproof power section, including load elements and cooling fan; Type 3R weatherproof control section, thermally and electrically isolated from resistive load power section; Double wall construction for cool exterior; Service access from three sides via hinged doors with lockable latches; Finish painted with a UL Listed process consisting of either a powder-coated finish or a liquid-coated finish consisting of an epoxy primer and a polyurethane finish.
  • Trailer: Extra-heavy duty steel trailer with steel deck. All welded frame construction. Meets all DOT requirements for highway use. 2000# lift jack. User specified hitches (2 5/16" ball hitch or 3" pintle ring hitch adjustable in 2" increments). 36" safety chains with hooks. Electric beak-away battery and switch. Electric driving brakes. Mechanical parking brake. DOT lighting and connector. Rear reflectors.
  • National Fire Protection Association (NFPA): Satisfies the requirements for emergency stand-by power systems.
  • UL Listed.


Neptune Trailer Load Bank Spec Sheet

Neptune Trailer Load Bank Drawing

Neptune Trailer Load Bank Operator's Manual

D-Series Digital Controller Brochure


  • Automatic Functions including auto-load regulation, auto exercising, and regenerative power protection.
  • Remote suitcase-style control panel with PLC-based touch-screen.
  • Additional Remote Controls.
  • External Fan/Control Power.
  • Main load disconnect breaker or fused disconnect switch.
  • Connection via cable in conduit, cable tray, cable duct, bus duct.
  • Anti-condensation heaters at 120V 1Ph, 240V 1Ph;, or any common 3Ph voltage.
  • Reactive units (inductive or capacitive).
Max Capacity Options:
200, 250, 300, 400, 500, or 600 kW (Other capacities up to 650 kW may also be available)
Single or Dual voltage; all common 3-phase 50, 60, and 400Hz available
60Hz Voltage Options:
208V, 220V, 240V, 416V, 440V, 450V, 460V, 480V, 575V, 600V
50Hz Voltage Options:
190V, 200V, 208V, 380V, 400V, 416V
Frequency Options:
50, 60, 400 Hz
Load Steps:
50KW resolution
Control/Cooling Power:
Internal, from load bus. Load control circuits and fan motor control operate 120V via transformer. Control circuits are fused. The cooling fan operates at 3-phase line voltage.
Cooling Fan:
200KW-350KW: 10,400 CFM, 3-HP; 400KW-650KW: 13,400 CFM, 5-HP
120°F maximum ambient temperature. Exhaust rise: 150°F - 200°F (Note: as airflow is not laminary, exhaust air temperatures are not equal at all points at plane of air exhaust. Some parcels of air may reach approximately 575°F before mixing.)
Dimensions HxWxD (inches):
200KW: 92 x 43 x 36 - includes 42" exhaust hood; Up to 650KW: 108 x 40 x 54 - includes 42" exhaust hood.
1,300 lbs
Trailer Construction:
Conforms to applicable Federal and DOT Standards. Hub and bearing assembly - cast iron with automative bearings. Wheel wells. Deck plate - 12 ga. hrs. Frame formed steel channel. 2000# lift jack.
Trailer Lights:
ICC 12V, electric lights with 7 pole connector (male and female component) (includes stop, turn, brake, and wire harness)
Trailer Brakes:
Electric and mechanical parking brake
Trailer Suspension:
Leaf springs
Trailer-Vehicle Connections:
2 5/16" ball hitch or 3" pintle ring hitch adjustable in 2" increments (user specified); 36" safety chains with hooks; Electric break-away battery and switch.
Trailer Weight Capacity:
3500 lbs. gross weight
Trailer Axle and Tires:
Single Axle, ST205-75-R14
Dimensions HxWxD with Neptune/Trailer:
130" x x76" x 150"
Weight with Neptune/Trailer:
3,500 lbs.
Limited Warranty:
12 Months

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