C18 Power Density (60 Hz)

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Producing reliable power from 455 ekW to 600 ekW at 60 Hz, our C18 diesel generator sets are made to meet your standby and prime applications. The engines are certified to the US EPA Tier 4 Final emissions levels. Each is designed to meet ISO 8528-5 transient response requirements and built to accept 100 percent rated load in one step. Seismic certification is also available for these models, so you can deliver power despite disturbances. Our integrated control system, including ATS and switchgear ensure a consistent power supply and connection to your fleet through on-site and remote monitoring options. We offer a wide range of EMCP 4 control panel options, with a simple screen display, consolidating all your management and diagnostics tools. The EMCP 4.4 controller provides on package paralleling capability, allowing you to use multiple generator sets to power your facility, providing added capacity and redundancy. We've made our generator sets adaptable to your demands with a broad range of accessories and bolt-on system expansion attachments. Find flexible packaging to fit your spatial restrictions and environmental conditions. Even choose UL 2200 and CSA certified package options for added safety.

Generator Set Specifications

  • Minimum Rating 455 ekW 455 ekW
  • Maximum Rating 500 ekW 500 ekW
  • Emissions/Fuel Strategy U.S. EPA Tier 4 Final U.S. EPA Tier 4 Final
  • Voltage 480 Volts 480 Volts
  • Frequency 60 Hz 60 Hz
  • Speed 1800 RPM 1800 RPM

Engine Specifications

  • Engine Model C18 ATAAC, I-6, 4-Stroke Water-Cooled Diesel C18 ATAAC, I-6, 4-Stroke Water-Cooled Diesel
  • Compression Ratio 14.5:1 14.5:1
  • Aspiration Air to Air Aftercooled Air to Air Aftercooled
  • Governor Type Adem™A4 Adem™A4
  • Fuel System Electronic unit injection Electronic unit injection

Design Criteria

The generator set accepts 100% rated load in one step per NFPA 110 and meets ISO 8528-5 transient response.

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
  • Cat Diesel Tier 4 Final Certified Engine

  • The four cycle Cat diesel engine combines consistent performance with excellent fuel economy and transient response that meets or exceeds ISO 8528-5.
  • The engines have been designed and built for a wide range of applications are certified to the US EPA Tier 4 Final emissions requirements.
  • The engines feature a reliable, rugged, and durable design that has been field proven in thousands of applications worldwide from emergency standby installations to continuously operating power plants.


  • Matched to the performance and output characteristics of Cat engines
  • Industry leading mechanical and electrical design
  • Industry leading motor starting capabilities
  • High Efficiency
  • Cat EMCP Control Panel

    The EMCP controller features the reliability and durability you have come to expect from your Cat equipment. EMCP4 is a scalable control platform designed to ensure reliable generator set operation, providing extensive information about power output and engine operation. EMCP4 systems can be further customized to meet your needs through programming and expansion modules.

    Single-Source Supplier

    Fully prototype tested with certified torsional vibration analysis available

    World Wide Product Support

    Cat dealers provide extensive post-sale support including maintenance and repair agreements. Cat dealers have over 1,800 dealer branch stores operating in 200 countries. The Caterpillar S•O•S℠ program cost effectively detects internal engine component condition, even the presence of unwanted fluids and combustion by-products

    Seismic Certification

  • Seismic Certification available.
  • Anchoring details are site specific, and are dependent on many factors such as generator set size, weight, and concrete strength.
  • IBC Certification requires that the anchoring system used is reviewed and approved by a Professional Engineer
  • Seismic Certification per Applicable Building Codes: IBC 2000, IBC 2003, IBC 2006, IBC 2009, CBC 2007, CBC 2010
  • Pre-approved by OSHPD and carries an OSP-0321-10 for use in healthcare projects in California
  • Cat Clean Emissions Module (CEM)

  • The Tier 4 Final engine has been optimized to work with the Cat CEM.
  • The CEM is a reliable, compact, and lightweight system that gives maximum installation flexibility.
  • It features a diesel oxidation catalyst for particulate matter (PM) and hydrocarbon (HC) control.
  • Selective catalytic reduction (SCR) reduces NOx output and provides integrated sound attenuation.
  • The CEM is controlled by a separate dosing module that has been integrated into the standard generator set controls for complete monitoring, protection and closed loop NOx control.
  • For more information on the CEM, refer to cut sheet LEHE0359.
  • UL 2200 / CSA - Optional

  • UL 2200 listed packages
  • CSA Certified
  • Certain restrictions may apply.
  • Consult with your Cat® Dealer.
  • C18 Power Density (60 Hz) Standard Equipment

    Exhaust System

    • Exhaust manifold; dry

    Fuel System

    • Primary fuel filter w/integral water separator & secondary filter
    • Fuel cooler
    • Fuel priming pump
    • Flexible fuel lines
    • Engine fuel transfer pump

    Generator and Attachments

    • Brushless, self-excited 2/3 pitch, random wound.
    • IP23 Protection
    • Insulation Class H and temperature rise
    • Power center, IP22 bottom cable entry
    • Segregated low voltage (AC/DC) wiring panel
    • AREP generator
    • CIP - generators

    Governing System

    • Cat Electronic Governor (ADEM A4)

    Lube System

    • Oil cooler
    • Lubricating oil
    • Oil filter and dipstick
    • Oil drain lines with valve; piped to edge of base
    • Fumes disposal; piped to front of radiator

    Protection System

    • Safety shutoffs for: Higher water temperature - Overspeed - Low oil pressure

    Cooling System

    • Coolant drain line with valve; terminated on edge of base
    • Fan and belt guards
    • Coolant Level Sensor
    • Thermostats and housing, full open temperature 92 deg C (198 deg F)
    • Coolant level sight gauge.
    • Jacket water pump, gear driven, centrifugal
    • Caterpillar Extended Life Coolant


    • 24-volt electric starting motor
    • 24V, 45 amp charging alternator.


    • Paint, Caterpillar yellow
    • Vibration damper
    • Parts book
    • Operation and maintenance manual pack and OMM Storage Compartment

    Control System

    • EMCP 4.2
    • Controls include: Run / auto / stop control - Speed adjust - Voltage adjust - Engine cycle crank - Emergency stop pushbutton
    • Digital indication for: rpm - DC volts - operating hours - Oil pressure (psi, kPa or bar) - Coolant temperature (C or F) - Volts (L-L & L-N), frequency (Hz) - Amps (per phase & average) - Power factor (per phase & average) - kW (per phase & average) - kVA (per phase & average) - kVAr (per phase and average) - kW-hr (total) - kVAr-hr (total)
    • Warning / Shutdowns with common LED indication of shutdowns for: Low oil pressure - high coolant temperature - Overspeed - Emergency stop - Failure to start (overcrank) - Low coolant temperature - Low coolant level
    • Programmable protective relaying functions: Generator phase sequence - Over / Under voltage (27/59) - Over / Under frequency (81 o/u) - Overcurrent (50/51)
    • Programmable Input / Output: 2 programmable digital inputs - 2 programmable relay outputs (Form A) - 2 programmable relay outputs (Form C)
    • Communications: Customer data link (RS485 Modbus RTu) - Serial annunciator module data link for local and remote annunciator IVR - Integrated Voltage Regulation (Digital) - EM10 Excitation Module
    • Control panel mounting location
    • Local annunciator
    • Remote annunciators
    • Control panel options: Dust proof control panel - volt free contact - Device server - Ground fault relay
    • Optional external analog input
    • Breaker box mounting location
    • Suitable for use as service equipment label
    • Separation plate

    Air Inlet System

    • Single element air filter
    • Air cleaner - Single element
    • Air cleaner - Heavy duty

    Extended Service Coverage

    • Silver, Gold and Platinum coverage

    Circuit breakers

    • 3 Pole 100% rated

    C18 Power Density (60 Hz) Optional Equipment

    Control System

    • EMCP 4.4
    • Control panel mounting
    • Local annunciator
    • Remote annunciators
    • Dust proof control panel
    • Volt free contact
    • Device server
    • Ground fault relay
    • Optional external analog input
    • Breaker box mounting location
    • Separation plate
    • Remote E-stop button

    Generators and Attachments

    • AREP Generator
    • CIP generators
    • Generator mounting and duct plate
    • Space heater

    Air Inlet System

    • Single element air filter
    • Dual element air cleaner


    • IBC certification wind load
    • Certificate of compliance

    Circuit breakers

    • Package mounted single circuit breakers
    • Motorized single circuit breaker
    • Dual breakers first circuit breaker (CB1) LS/I package mounted
    • Dual breakers first circuit breaker (CB2) LS/I package mounted
    • Auxiliary contacts
    • Neutral bars
    • Current transformers
    • Power cables

    Cooling System

    • Standard radiator
    • Aftertreatment guard


    • Sound attenuated enclosures

    Exhaust System

    • Exhaust flexible fittings
    • Flange kits

    Fuel System

    • 660 gallon base tank

    Generator Attachments

    • Permanent magnet generator

    Mounting System

    • Standard base Wide
    • Optional CB shroud
    • Locking fuel fill
    • 5 gallon spill containment
    • Overfill prevention valve

    Starting / Charging System

    • 10 Amp dual battery charger
    • Battery disconnect switch
    • Jacket water heater
    • Shore power control group


    • PGS test report @ 1.0 power factor
    • PGS test report @ 0.8 power factor
    • Generator test report
    • 4 Hour factory test (un-witnessed)

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