G3520 2500kW Gas Generator Set

Cat® G3520 (1750kW-2500kW) Natural Gas Generator models are recognized as a symbol of power generation versatility due to many proven industry applications.


Caterpillar is leading the power generation marketplace with Fast Response generator sets engineered to deliver unmatched performance, reliability, and cost-effectiveness.Electric Power


60 Hz

Cat G3520 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 and hydrogen blends
  • 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

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

Worldwide 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

SR5 Generator

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

Cat ECS 100 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

Proven System

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


  • EPA Certified for use in Emergency and Non-Emergency applications
  • Additional a NOx selectable genset is available to meets most worldwide emissions requirements down to 0.5 g/bhp-hr NOx level without aftertreatment

  • Standard Equipment
  • Optional Equipment
  • Specs
  • Docs

Standard Equipment

  • Air Inlet
    • Two-element single-stage air cleaner with enclosure and service indicator
  • Control Panel
    • Cat ECS 100
  • Cooling
    • Jacket water and SCAC engine-driven pumps
    • Jacket water and SCAC thermostats
  • Exhaust
    • Cat-flanged face outlet on turbocharger
    • Individual exhaust port and turbocharger outlet wired to integrated temperature sensing module (ITSM) with GCEM providing alarms and shutdowns
    • Dry exhaust manifolds, insulated and shielded
  • Fuel System
    • Gas pressure regulator
    • Engine-installed electronic control valve
    • 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
    • 24V DC energized-to-run (ETR) gas shutoff valve
    • Throttle plate, 24V DC actuator, controlled by GECM
  • General
    • Crankshaft vibration damper and guard
    • Operation and maintenance manuals
    • RH Service
    • Paint- Caterpillar Yellow with high gloss black rails and radiator
    • Parts book
  • Generator
    • SR5
    • Permanent Magnet Excitiation
    • NEMA Class H insulation
    • Winding temperature detectors
    • Integrated voltage regulator (IVR)
    • Anti-condensation space heater
  • Starting/Charging
    • Battery with cables and rack (shipped loose)
    • 24V starting motors
    • Electric Starter
    • Jacket water heater
  • Governing System
    • ADEM A4
  • Ignition System
    • Electronic Ignition System (controlled by ADEM A4)
    • Individual Cylinder Detonation Sensitive Timing (DST)

Optional Equipment

  • Air Inlet
    • Air cleaner with precleaner
  • Control Panel
    • Local alarm module
    • EMCP 4.4
    • Remote annunciator
    • Remote PC monitoring
    • Engine failure relay
    • Local PC monitoring
  • Circuit Breakers
    • 2000A, 2500A, 3000A 3 Pole, UL-100% Rated Masterpact Circuit Breakers
    • 100% rated, 3-pole (UL/CSA/IEC) 5th Digit Rating
    • 3-pole (IEC 947-2 rated)
    • Frame mounting
    • 1600A, 2000A 3 Pole, UL-100% Rated R-Frame Circuit Breakers
    • S LSI, G LSIG, P LSIG-P, 4th Digit Type
  • Cooling
    • Coolant level drain line with valves, fan with guard
    • Package mounted radiator
  • Exhaust
    • 305 mm (12 in.) muffler
    • 305 mm (12in.) elbow
    • 18, 25 dBA Attenuation
    • 305 mm (12 in.) flange
    • 305mm (12 in) spark arresting muffler
  • Fuel System
    • 3, 0-100 kPag, 4-20mA gas train pressure sensors
  • General
    • Digital diagnostic tool
  • Generator
    • Low voltage extension box
    • Bearing temperature detectors
    • European bus bars
    • Cable access box
    • Generator air filter
  • Starting/Charging
    • 45A, 24V charging alternator (requires engine driven pumps)
    • 20A, 24VDC battery charger
  • Grid Code Compliance
    • 60 Hz: USA



Long Name:
G3520 2500kW Gas Generator Set

Generator Set Specifications

Gas Standby Rating
2500 ekW @ 0.8pf
Fuel Type
Natural Gas, Hydrogen Blend (up to 5%)
Emissions/Fuel Strategy
U.S. EPA Stationary Non-Emergency Certified
1800 rpm
60 Hz

Engine Specifications

Engine Model
5956 in³ / 97.6 l
6.7 in / 170 mm
8.5 in / 215 mm

Generator Set Specifications

Compression Ratio

Generator Set Dimensions

336 in / 8534 mm
94 in / 2386 mm
128 in / 3230 mm
48500 lb / 22000 kg