C27 Generator Set



Technical Specifications
Benefits and Features

The C27 diesel generator sets have been developed for your mission critical, standby and prime applications. Producing reliable power from 680 to 800 ekW at 60 Hz, each generator set has been designed to meet ISO 8528-5 transient response requirements and to take on 100 percent rated load in one step. The C27 is certified as a low fuel consumption system as well as having a certificate for EPA Stationary Emergency (Tier 2). Seismic certification is also available for selected models, ensuring your generator sets are equipped for that unexpected disturbance. The integrated control system, including ATS and switchgear, ensures a consistent power supply and connection to your fleet through on-site and remote monitoring options. Our EMCP 4 control panel features a user-friendly interface and puts your management and diagnostics tools in one location. The EMCP 4.4 controller provides multi generator set paralleling capability, allowing you to use multiple generator sets for increased power output and improved reliability. It’s not just quality that matters but customization, choose from a broad range of accessories and bolt-on system expansion attachments. Discover our upgradeable packaging options to work with your spatial restrictions and environmental conditions. Our C27 generator sets are developed for such prerequisites, so that you can meet your specific power needs. Build in additional safety features with the UL 2200 and CSA certified package options.

Generator Set Specifications
Minimum Rating 635 ekW
Maximum Rating 800 ekW
Emissions/Fuel Strategy Low Fuel, Tier 2 Nonroad Equivalent
Voltage 208 to 600 Volts
Frequency 60 Hz
Speed 1800 rpm
Duty Cycle Standby, Prime
Engine Specifications
Engine Model C27 ATAAC, V-12, 4-Stroke, Water-Cooled Diesel
Bore 5.4 in
Stroke 6 in
Displacement 1649.47 in³
Compression Ratio 16.1:1
Aspiration TA
Fuel System MEUI
Governor Type Adem™A4
Generator Set Dimensions
Length - Maximum 184 in
Width - Maximum 67.8 in
Height - Maximum 85.1 in

Cat Generator Set Package

  • Cat generator set packages have been fully prototype tested
  • Accepts 100% block load in one step and meets NFPA 110 loading requirements
  • Conform to ISO 8528-5 steady state and transient response requirements

Cat Diesel Engine

  • Reliable, rugged, durable design
  • Field-proven in thousands of applications worldwide
  • Four-stroke-cycle diesel engine combines consistent performance and excellent fuel economy with minimum weight

SR5 Alternator

  • Superior motor starting capability minimizes need for oversizing alternator
  • Designed to match performance and output characteristics of Cat diesel engines
  • Robust Class H insulation

EMCP 4 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 55°C (131°F)
  • Contact your Cat Dealer for specific ambient and altitude capabilities


  • UL 2200
  • CSA
  • IBC seismic certification
  • OSHPD pre-approval

One Safe Source

  • Components used in the generator set are selected based on seamless design integration to provide the optimum performance
  • The generator set is fully assembled at a Caterpillar facility following our quality guidelines
  • Each generator set package is tested before leaving the Caterpillar facility
  • Cat product support, including dealer service, parts and warranty covers the entire Cat power system

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

Standard Equipment:

  • Air Inlet
    • Air Cleaner; single element canister type with service indicator
  • Control Panel
    • EMCP 4.2B
    • Digital Indicators
    • Warning/shutdown Indicators
    • Programmable Protective Relaying Functions
    • Communications
    • Features:
  • Cooling System
    • Coolant level sensor
    • Coolant drain line with valve terminated on edge of base
    • ATAAC
    • Caterpillar Extended Life Coolant
    • Radiator sized to 50 degrees C
    • Fan and belt guards drive
  • Exhaust System
    • 203mm (8in) ID round flanged outlet
    • Exhaust Manifold - dry
  • Fuel System
    • Primary fuel filter with integral water separator
    • Electric fuel priming pump
    • Fuel cooler
    • Flexible fuel lines - installed
    • Secondary fuel filter
  • Generators And Attachments
    • Integrated Voltage Regulator (IVR) includes
    • For EPA Stationary Emergency (EPA Tier 2 Emissions) configurations:
    • Bus bar connections:
    • SR5 Permanent Magnet (PM)
    • For Low BSFC configurations:
  • Lube System
    • Standard volume oil pan - 68 Ltr
    • Lubricating oil
    • Oil drain lines and valve
    • Gear type lube oil pump
    • Oil filter, filler and dipstick
    • Fumes disposal - open crankcase ventilation routed to front of package
    • Integral lube oil cooler
  • Mounting System
    • Rubber anti-vibration mounts - shipped loose
    • Rails - engine/generator/radiator mounting
  • Starting And Charging System
    • 24-volt electric starting motor
    • Battery, rack and cables - shipped-loose
    • Battery disconnect switch
    • Charging Alternator 45A
  • General
    • Paint: Caterpillar Yellow with high gloss black rails & radiator
    • SAE Standard Rotation
    • Right hand service
    • Flywheel and flywheel housing-SAE No. 0 and SAE No. 18

Optional Equipment:

  • Air Inlet System
    • Standard air cleaners
    • Heavy duty air cleaners
    • Dual element air cleaners
  • Starting / Charging System
    • 20 Amp enclosure battery chargers
    • 10 Amp battery chargers
    • 24 Volt battery sets - Dry
    • Air starting motor with control and silencer
    • Space heater
    • 24 Volt electric start motors - Heavy duty
    • Jacket water heaters
  • Circuit Breakers
    • 400, 800, 1200, 1600, 2000, 2500, 3000 Amp, 3 pole, UL-100% rated circuit breakers
    • 2000 Amp, 3 pole, IEC rated circuit breakers
    • 800 Amp, 4 pole, IEC rated circuit breakers
  • Control Panels
    • Cable shroud - Bottom mounted
    • Cable shroud - Top mounted
    • EMCP 4.3, EMCP4.4
    • Side extension box
    • Remote annunciator modules
    • Auxiliary box options
    • Remote mounted panel harness mounting kit
    • Remote mounted circuit breaker terminals
    • Modbus monitor local packages
    • Remote DIO module
    • Cat connect telematics
    • Load share module
    • Vandal proof panel cover
    • Installed DIO module
    • Remote mounting harness
    • Annunciator modules
  • Cooling System
    • Radiator duct flange
    • High ambient radiator
    • Extended life coolant
    • Certified radiator
    • Standard radiator
  • Enclosures
    • Enclosure louvers
    • Enclosure with lifting base or fuel tank
    • Panel bracket
    • AC distribution panel, lights and outlet
    • Enclosure lighting
    • Enclosure colors
    • Special sound attenuated enclosure
    • Enclosure fuel tank options
    • Cold weather bundle
  • Exhaust System
    • Mufflers
    • Elbows
    • Flanges
    • Exhaust through the wall kit
    • Flexible fittings
    • Guard and shield system
  • Generator And Attachments
    • 60 Hz standard generators
    • 60 Hz premium generators
  • Lube System
    • Prelube pumps
    • Oil level regulator
  • Mounting System
    • Mounting base type
    • IBC vibration isolators
    • Puck style low efficiency isolators
    • Spring type vibration isolators
  • Power Connections
    • Center post busbar
    • Cable entry - Right / Left / Rear
    • Neutral grounding connection
    • Power connections - Right / Left / Rear
  • Special Tests / Reports
    • Torsional vibration analysis report
    • Generator test report
    • IBC Seismic certifications
    • OSHPD Seismic certifications
    • PGS test report @ 1.0 power factor
    • PGS test report @ 0.8 power factor
    • Special CSA test cerification
    • Standard engine test
  • General
    • Miscellaneous inspection
    • US aid emblem
    • Special paint
    • SGS Inspection