XG400 400kW (500 kVA)

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This new rental package delivers optimal performance, produces fewer greenhouse gasses, and provides the features and flexibility to fully meet the needs of the Rental and Petroleum markets.

Generator Set

Rating 400 ekW (500 kVA) Continuous 400 ekW (500 kVA) Continuous Less
Frequency 60Hz 60Hz Less
Voltage 208 - 600 V 208 - 600 V Less


Engine CAT CG137-12 TA Gas Engine CAT CG137-12 TA Gas Engine Less
Fuel Natural Gas Natural Gas Less


Width - With Trailer 96.0 in 2438.0 mm Less
Height - With Trailer 162.0 in 4115.0 mm Less
Length - With Trailer 9144.0 ml 360.0 in Less
Weight - With Trailer, Lube, Oil and Coolant 39500.0 lb 17917.0 kg Less

Fuel/Emissions Strategy

U.S. EPA Tier 2 for Large Non-road Spark-ignition Engines

CAT® CG137-12 TA Gas Engine

  • Robust high speed diesel block design provides prolonged life and lower owning and operating costs.
  • Engine ratings developed to accept low-quality gas down to Cat MN 30

CAT EMCP 4.4 Control Panel

Fully featured power metering, protective relaying, and engine/generator control and monitoring.

Cat Generator

  • Cat SR4B 593 frame generator designed to match performance and output characteristics of the Cat gas engine.
  • Segregated AC/DC, low voltage accessory box provides single point access to accessory connections

CAT Integrated Voltage Regulator (IVR)

Three-phase generator voltage sensing with adjustable volts-per-hertz regulation.


  • 30' ISO high cube container.
  • Sound attenuated air intake louvers
  • Three lockable personnel doors with panic release.
  • Meets 75 dB(A) at 7 meters sound performance per SAE J1074

Distribution Panel

600/346V, 480/277V, 240/139V, 208/120V, 3-phase.

Side Customer Access

Side buss bar access door, external access load connection buss bars.

Internal Lighting

Three internal DC lights with one timer installed at the container door.

Rental Ready Features

  • Anti-condensation heater 110-120 VAC.
  • Coolant heater 110-120 VAC.
  • UL Listed battery charger.

Cooling System

Provides 40 ºC (122 ºF) ambient capability with 0.5 g/bhp-hr NOx per NSPS 2010 at 100% continuous rating.

XG400 - Natural Gas Standard Equipment

Control Panel
  • EMCP 4.4 genset mounted controller

Cooling System
  • Package-mounted radiator with vertical air discharge provides 40ºC ambient capability

    • Sound attenuated 75 dB(A) @ 7 m.
    • 30' ISO high cube container.

Exhaust System
    • Catalyst w/spark arresting muffler
    • Crankcase fumes disposal system

Fuel System
    • Gas pressure regulator.
    • Low pressure fuel system.
    • Methane detection.

Mounting System
  • Generator set soft mounted to container floor

  • Factory testing of standard generator set

20 Amp battery charger
  • UL/CSA listed 120V

  • CG137-12 TA

canister-type air cleaner with service indicator
  • Single element

external access load connection buss bars
  • Side buss bar access door

integral oil cooler
  • Pump

  • Single electric starting motor

  • SR4B 593 frame

Why Choose Cat® Electric Power?

Caterpillar offers a comprehensive variety of electric power systems, customized to fit your needs. Our specialized systems deliver high power and performance in industries across the globe. With Caterpillar, you get outstanding manufacturing quality, expert support, and the essential tools and applications to complete any project.

Learn More About Electric Power

EMCP 4 Generator Set Controls

Cat generator sets provide a complete factory-built solution with fully featured standard and advanced controls. Optional accessories enhance the capabilities of the genset package-mounted control system.

Learn More

Application Center

Explore valuable resources for generator sizing, specification, and training materials. SpecSizer evaluates load types, collects data, and organizes it to help you select the generator set that's best for you. Find product comparisons, technical data, product sizing, and more using our technical information portal (TIP) specifically created for consultants, architects, engineers, and owners.

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