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Simplex Mars Stationary Load Bank (700-1250kW)

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Call with Options for Price Quote: 1-888-331-5344
2,370.00 LBS

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The Simplex Mars 2.0 stationary outdoor resistive load bank features a highly standardized, advanced design covering the 700-1250 kW range at all common three phase voltages up to 600VAC. Mars 2.0 is a standard inventory item with versatile control and application possibilities.


  • Standard Inventory Models: 700, 750, 800, 900, 1000, 1100, 1150, 1200, and 1250 kW; 480 or 600 VAC (Other kW and VAC options available up to 1250 kW and 600 VAC).
  • Completely Self-contained, Free-standing Unit: Includes all resistive load elements, load control devices, load element branch circuit fuse protection, main load bus and terminals, cooling system, control power supply, unit controller and malfunction detection system and NEMA type enclosure.
  • Numerous Applications: Ideal for high capacity load testing of generators, UPS, and other AC power sources; periodic reliability exercise of standby generators; automatic load leveling and minimum load regulation; regenerative/reverse power protection and other load bank applications.
  • Duty Cycle: Rated for continuous operation.
  • Load Step Resolution: 25kW minimum.
  • System Controls: Digitally controlled via an on-board PLC. Choice of local or remote control using a standard digital color touchscreen HMI. Remote control connection is simplified through use of RS-485 over shielded/twisted pair network cable (1000m). Local/remote HMI is housed in a weather/tamper resistant, lockable enclosure. Manual control via direct numeric keypad entry is standard.
  • Control Power: Internal from load bus via transformer.
  • Cooling: Integral forced air cooling system. Three phase, direct drive motor driving cast aluminum fan blade. Circuit breaker combination motor starter. Rain shedding exhaust hood. Cooling airflow through the enclosure is vertical with cold air intake at the bottom and hot air exhaust out the top.
  • Load Elements: Elements mounted in easily accessible, slide out trays; Simplex Powr-Web chromium alloy, open wire, continuously supported, power resistor; UL recognized.
  • 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.
  • System Protection/Malfunction Detection: Fan failure, high exhaust temperature, high intake temperature; lockout and alarm. Exhaust temperature indicated on screen.
  • Load Connection: Plated bus bar within an oversize terminal junction box.
  • Enclosure: Modular enclosure consists of three parts: power section, control section, and exhaust hood. Type 3R weatherproof power section includes load elements and cooling fan. Type 3R weatherproof control section is thermally and electrically isolated from resistive load power section. The rain shedding exhaust hood mounts on the top of the power section. The exhaust hood may be deleted and a duct flange provided for indoor applications where air is exhausted through a duct to the outdoors. The load bank enclosure is of double wall construction for cool exterior. All access via hinged doors with lockable latches. All exterior fasteners are stainless steel. Intake and exhaust openings are screened. Enclosure is powder-coated dark gray. Exhaust hood is powder-coated high temperature black.
  • National Fire Protection Association (NFPA): Satisfies the requirements for emergency stand-by power systems.
  • UL Listed.


Mars Brochure

Mars Drawing

Mars Customer Connections Diagram

Mars Technical Specs


  • Automation with Auto-Load Regulation and Regenerative Power Protection
  • Anti-condensation heaters with thermostatic control
  • Load Bank control and monitoring via BMS
  • Replace MODBUS RTU-485 with TCP capability
  • External Fan/Control Power
  • Main load disconnect breaker or fused disconnect switch
  • Connection via cable in conduit, cable tray, cable duct, bus duct.
  • Indoor enclosure configuration with duct flange instead of exhaust hood.
  • Sound attenuation enclosure.
  • Highway Trailer: Construction conforms to applicable Federal and DOT standards. Includes: safety chains, electric lights, electric brakes, leaf springs, ball hitch coupler, lift jack and caster.
Max Capacity Options (kW):
Standard Models: 700, 750, 800, 900, 1000, 1100, 1150, 1200, or 1250 kW (Other capacities up to 1250 kW also available)
Voltage Options:
Standard Models: 480 or 600 VAC (All common 3 Phase 50 / 60Hz voltages 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 Hz
Load Steps:
25 KW resolution standard. (25-25-50-100-100-250... KW)
Fan/Control Power:
internal from load bus. Control circuits at 120V via transformer. The cooling fan operates at 3-phase line voltage. Load control circuits and fan motor control operate at 120V. Control circuits are fused. External option available.
27,400 CFM, 10-HP
120°F maximum ambient temperature. Exhaust rise: 150°F - 200°F. Hot spots: 575°F
Dimensions HxWxD (inches):
48"W x 113"H x 75"D - includes 42" exhaust hood
2,370 lbs - includes exhaust hood (570 lbs)
Limited Warranty:
12 Months

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