Gas Generator G3512H

Cat® G3512H (1061kW-1515kW Gas) Generator models deliver top tier electrical efficiency while providing the lowest maintenance and overhaul costs.


From natural gas to biogas, coal mine gases, or hydrogen fuel blends to support combined heat and power (CHP), emergency power, and local grid support applications, Caterpillar has a wide range of reliable gas power solutions.G3512H Generator SetElectric Power


50 / 60 Hz

Cat G3512H 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 mixtures
  • 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


  • 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

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

  • Standard Equipment
  • Optional Equipment
  • Specs
  • Docs

Standard Equipment

  • Air Inlet
    • Package Mounted Air Cleaner with service indicator
  • Cooling
    • Jacket water and SCAC thermostats
    • 2nd Stage CAT Flange
    • ANSI Class 150 JW Connection
    • Engine driven pumps for jacket water and aftercooler cooling
  • Control Panels
    • Dedicated customer wiring terminals
  • Control Panel
    • EMCP4.3
  • Exhaust
    • Dry exhaust manifolds insulated and shielded
    • Center section cooled turbocharger with Cat flanged outlet
  • Generator
    • High efficiency low voltage Cat generator, permanent magnet excitation, digital regulation, IP23 water ingress protection, & form wound construction.
  • Starting/Charging
    • Electric Starter
  • General
    • Paint - Caterpillar Yellow except rails and radiators gloss black
    • Crankshaft vibration damper and guard

Optional Equipment

  • Air Inlet
    • Mounting brackets and piping
    • Air cleaner with precleaner
  • Control Panels
    • Remote annunciator
  • Circuit Breakers
    • Frame mounting circuit breaker orientation
    • 2500A 3-pole IEC rated circuit breakers
    • Rear Mounted Circuit Breaker
    • 3000A/3200A/4000A UL100% Rated Masterpact circuit breaker (60 Hz only)
    • LSI Long-Time, LSI-P Long-Time, LSIG Long-Time, LSIG-P Long-Time,
  • Control Panel
    • Language Options
    • Cable Shroud Location
    • Engine failure relay
    • Discrete I/O module, 12 digital points, 8 'Form C' relay
    • 16 point/32 light annunciator with NFPA99-110/CSA282 configuration
    • Empty Upper Box Right/Left
    • Local Alarm module
    • Synchronization module
    • Cat Connect: Ethernet, satellite, or cell telematics
    • Local/Remote PC Monitorring
    • Right/Left/Rear Extension Box
  • Cooling
    • Remote radiator for JW and SCAC circuits
    • 220V (50Hz), 240V (60Hz), 480V (60Hz) JW heater
  • Exhaust
    • Flexible fitting [305mm x 305mm (12in. X 12in.)] w/ 12 bolt-flanges
    • 406mm (16in.) sparking-arresting muffler with companion flange
    • Exhaust expander [250mm-329mm (10in-12in)]
    • 305mm (12 in.) flange
    • Muffler options
    • Elbow exhaust
  • Fuel System
    • 1/2" NPT gas train conduit connectors
    • 3, 0-100kPag 4-20mA gas train pressure sensors
    • Fuel Filter
    • Gas knockdown regulators
  • General
    • Digital Diagnostic tool
    • US Aid emblem
  • Generator
    • Generator air filter
    • Manual voltage control
    • Cable access box
    • RTD Monitorring
    • Bearing temperature detectors
  • Governing System
    • ADEM A4 4-20mA (0-5V) speed input
  • Starting/Charging
    • Battery with cables and rack
    • 24V Starting motors
    • 20A, 24VDC battery charger
    • 45A, 24V charging alternator (requires engine driven pumps)
    • Jacket water heater
  • Grid Code Compliance
    • 60 Hz: USA
    • 50 Hz: Germany, Great Britain, Belgium, Romania, Italy, Ireland, Poland, Netherlands, Spain, France, and European Standard



Long Name:
Gas Generator G3512H

Generator Set Specifications

Continuous Rating
1515 ekW / 1505 ekW @1.0pf
Fuel Type
Natural Gas, Hydrogen Blend (up to 25%)
Maximum Electrical Efficiency
50 / 60 Hz
1500 rpm

Engine Specifications

Engine Model
3574 in³ / 59 l
6.7 in / 170 mm
8.5 in / 215 mm

Generator Set Dimensions

223 in / 5656 mm
76 in / 1921 mm
91 in / 2308 mm
Dry Weight - Genset
31085 lb / 14100 kg

Engine Specifications

Governor Type