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G3520E Gas Generator Set


CAT G3520E Gas Engine

  • Robust high speed block design provides prolonged life and lower owning operationg costs
  • Designed for maximum performance on low pressure pipeline natural gas
  • Simple open chamber combustion system for reliability and fuel flexibility
  • 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

SR5 Generator

  • Designed to match performance and output characteristics of Caterpillar gas engines
  • Industry leading mechanical and electrical design
  • High efficiency

EMCP 4.3 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

CAT Electronic Control System

  • Simple user friendly interface and navigation
  • Digital monitoring, metering and protection setting
  • Fully-featured power metering and protective relaying
  • Remote control and monitor capability options

Cooling System


  • Meets most worldwide emissions requirements down to 0.5 g/bhp-hr NOx level without aftertreatment

Proven System

  • Field proven in a wide range of applications worldwide
  • fully prototype tested
  • Certified torsional vibration analysis available

Full Range of Attachments

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

World Wide Product Support

  • Cat dealers have over 1,800 dealer branch stores operating in 200 countries
  • Your local Cat dealer provides extensive post-sale support, including maintenance and repair agreements

Generator Set Specifications
Maximum Continuous Rating 2022 ekW
Fuel Type Natural Gas
Maximum Electrical Efficiency 41.50%
Maximum Standby Rating 2022
Frequency 50
RPM 1500
Engine Specifications
Engine Model G3520E
Displacement 86 l (5248 inu00b3)
Aspiration TA
Bore 170 mm (6.7 in)
Stroke 190 mm (7.5 in)
Generator Set Dimensions
Length 6893 mm (271 in)
Width 2001 mm (79 in)
Height 2727 mm (107 in)
Dry Weight - Genset 17826 kg (39306 lb)
Engine Specifications
Fuel System Natural Gas
Compression Ratio 11.9

Standard Equipment

  • Control Panel
    • EMCP 4.3
  • Air Inlet
    • Two-element single-stage air cleaner with enclosure and service indicator
  • Cooling
    • Standard CAT Flange
    • Right-Hand/Left-Hand Outlet Connections
    • Engine driven water pumps for jacket water and aftercooler
    • ANSI/DN adapter flange connections 
  • Exhaust
    • Individual  exhaust port and turbocharger outlet wired to Integrated Sensing Module (ISM) with Gas ECM providing alarms and shutdowns
    • Dry exhaust manifolds, insulated and shielded
  • Fuel System
    • Fuel system is sized for 31.5 to 47.2 MJ/NM3 dry pipeline natural gas with pressure of 10.2 to 34.5KPa to the engine fuel control valve
    • Fuel filter
    • Engine installed, fuel metering valve
    • 24V ETR Gas Shutoff Valve
    • Throttle plate, 24V DC actuator, controlled by GECM
  • Ignition System
    • Individual Cylinder Detonation Sensitive Timing (DST) 
    • Electronic Ignition System (controlled by GECM) 
  • Generator
    • SR4B
    • Caterpillar’s Digital Voltage Regulator (CDVR) with 3-phase sensing and KVAR/PF control
    • Busbar connections
    • SR5
    • Winding temperature detectors
    • Permanent Magnet Excitiation
    • Anti-condensation space heater
    • 3-phase brushless, salient pole
  • General
    • RH Service
    • Crankshaft vibration damper and guard
    • Paint – Caterpillar Yellow except rails and radiators gloss black

Optional Equipment

  • Air Inlet
    • Heavy duty air cleaner
    • Regular duty air cleaner
    • Air cleaner with precleaner
    • Mounting stand
  • Contol Panel
    • Local NFPA99-110 Alarm Module w/LEDs
    • PL1000E/PL1000T Communications Module
    • Remote 24V-32V 8/16 Light Annunciator
    • Custom 8-Light Alarm Module
    • Engine Failure Relay
    • Synchronizing Module
  • Control Panels
    • Local alarm module
  • Cooling
    • Jacket water coolant heater
    • Cat Flange, ANS/DIN Adapter Flange
    • Engine Pumps
    • Aftercooler air lines, aftercooler core replacement
    • Inlet/Outlet connections
  • Exhaust
    • 15/18/25 dBA Muffler Attenuation
    • 305/356mm Flange/Exhaust Expanders, 305/406mm Flange and Exhaust Expander
    • 356-406mm Flange and Exhaust Expander
    • Mufflers (15/18/25 dBA Attenuation) and spark-arresting muffler with ANSI companion flanges
    • 305/360/406 mm Elbow Kits
    • Flexible Fittings
    • 16″ Spark Arresting Muffler
  • Fuel System
    • Gas Train (31.5 MJ/Nm3 with inlet pressure 19.2 to 48.3 kPa (2.78 to 7 psi))
    • Gas Train 0-100 kPag, 4-20mA pressure sensors
    • Fuel Filter, Gas Filter
    • 24VDC Gas Shutoff Valve, Gas Knockdown Regulator
  • Generator
    • Annunciator modules
    • Air filters, cable access box
    • Bearing temperature detectors
    • Low voltage extension box
    • 16 Point/32 light annunciator with NFPA99-110/CSA282 configuration
    • Extension box, European bus bars
    • Generator air filter
    • Medium and high voltage generators and attachment
    • 415/400/380, 3300/6600/11000 Volt Generator Options (50 Hz)
    • 480/4160/13200 Volt Generator Options (60 Hz)
    • 8/15/23M harness
    • 8.7/15 kV Cross, Differential, Current Transformers (CCCT, DCT, CT)
    • Cable access box
  • Governing System
    • Load share module
  • Starting/Charging
    • Battery diconnect switch
    • 45A, 24V charging alternator (requires engine driven pumps)
    • 24V Starting Motors
    • 20A Battery Charger
    • Battery with cables and rack (shipped loose)

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