DG400 (3-Phase)

DG400 (3-Phase)

DG 400, Cat® CG18 In-line 6, 4-cycle Natural Gas, Generator Set


The Cat® spark-ignited lean burn generator for stationary standby, demand response and limited time power (LTP) applications offer reliable power with best in class fuel efficiency, lower footprint and cleaner exhausts. The abilitity to operate even at very low fuel inlet pressures makes it best suited for a range of applicationsCaterpillar is leading the power generation marketplace with Power Solutions engineered to deliver unmatched flexibility, expandability, reliability, and cost-effectiveness.Electric Power


208 - 600 VAC


60 Hz

Emissions Strategy

  • Certified EPA Stationary Emergency
  • Complies with emission standards required for local permits

Cat CG18 Engine

  • Robust high speed block design provides prolonged life and lower owning operationg costs
  • Designed for maximum performance on low pressure pipeline natural gas
  • Leading edge technology in ignition system and air/fuel ratio control for lower emission and engine efficiency
  • One electronic control module handles all engine functions: ignition, governing, air/fuel ratio control and engine protection


  • Class H Insulation. Highest classification ensures alternator durability
    • Matched to the performance and output characteristics of Cat gas engines
    • Industry leading mechanical and electrical design
    • Industry leading motor starting capabilities
    • High Efficiency

EMCP 4.2B Control Panel

  • User-friendly interface and navigation
  • Scalable system to meet a wide range of installation requirement
  • Expansion modules and site-specific programming for specific customer requirements

Cooling System

  • Designed to operate in standard ambient temperatures up to 43°C (110°F)
  • Contact your Cat Dealer for specific ambient and altitude capabilities

Full range of attachments

  • Wide range of bolt-on system expansion attachmentsr
  • Factory designed and tested
  • Flexible packaging options for easy and cost effective installation


  • Compact in-line design allows for improved packaging, resulting in the smallest genset footprint

  • Standard Equipment
  • Optional Equipment
  • Specs
  • Docs

Standard Equipment

  • Exhaust
    • Dry exhaust manifolds, insulated and shielded
  • Fuel System
    • Gas train with Zero Pressure regulator
    • ECU controlled shutdown solenoid
    • Airfuel Ratio Control, Venturi type Air-Gas mixer, throttle controlled valve
  • Controls
    • EMCP 4.2B
    • Integrated Voltage Regulator (IVR)
  • Telematics
    • PL444 Product link 4G LTE Telematics
  • Generator
    • Anti-condensation space heater
    • SR5
  • Governing
    • Electronic Governing
  • Starting/Charging
    • 24V starting motors
  • General
    • Paint - Caterpillar Yellow except rails are gloss black
    • Operation and maintenance manuals
    • Parts book

Optional Equipment

  • Air Inler
    • Air inlet adapters
  • Cooling
    • Inlet/Outlet connections
  • Exhaust
    • Flexible fitting
    • Elbow, Flange
    • Muffler and spark-arresting muffler with companion flanges
    • Exhaust expander
  • Telematics
    • PLG 601 & 641 Product link Telematics
  • Generator
    • Permanent Mangnet Excitation
    • Low voltage extension box
    • Generator air filter
    • European bus bar
    • Cable access box
  • Enclocures
    • Sound Attenuated and Weather Protective
  • Starting/Charging
    • Jacket water heater
    • Space Heaters
    • Charging alternator
    • Battery with cable and rack (shipped loose)
    • Battery charger
    • Oversized battery
  • General
    • Engine barring group
    • EEC D.O.I and other certifications
    • Crankcase explosion relief valve



Long Name:
DG400 (3-Phase)
DG400 (3-Phase)

Generator Set Specifications

60 Hz
Emissions/Fuel Strategy
U.S. EPA Certified for Stationary Emergency Application and Non-Emergency Applications
208 - 600 VAC
Natural Gas Rating
400 ekW

Engine Specifications

Engine Model
Cat® CG18 In-line 6, 4-cycle Natural Gas
Fuel System
Gas mixer, Venturi
Turbocharged - Air-to-Air Aftercooled
Governor Type
1106.3 in³ / 18.1 l
Compression Ratio
5.7 in / 145 mm
7.2 in / 183 mm

Generator Set Dimensions

154 in / 3581 mm
73 in / 1854 mm
82 in / 2083 mm
10721 lb / 4863 kg

Generator Set Specifications

Fuel Type
Natural Gas