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Producing reliable power from 1230 to 1500 ekW at 60 Hz, our 3512C diesel generator sets are made to meet your mission critical, continuous, standby and prime applications. We've designed each to ISO 8528-5 transient response requirements and to accept 100 per cent rated load in one step. Generator sets are U.S. EPA Certified for Stationary Emergency Use Only (Tier 2 Nonroad Equivalent Emission Standards)

Generator Set Specifications

Minimum Rating 1230 ekW 1230 ekW Less
Maximum Rating 1500 ekW 1500 ekW Less
Emissions/Fuel Strategy U.S. EPA Certified U.S. EPA Certified Less
Voltage 380 to 13800 Volts 380 to 13800 Volts Less
Frequency 60 Hz 60 Hz Less
Speed 1800 rpm 1800 rpm Less
Duty Cycle Standby, Mission Critical, Prime, Continuous Standby, Mission Critical, Prime, Continuous Less

Engine Specifications

Engine Model 3512C ATAAC, V-12, 4-Stroke Water-Cooled Diesel 3512C ATAAC, V-12, 4-Stroke Water-Cooled Diesel Less
Bore 6.69 in 170.0 mm Less
Stroke 7.48 in 190.0 mm Less
Displacement 3161.03 in³ 51.8 l Less
Compression Ratio 14.7:1 14.7:1 Less
Aspiration TA TA Less
Fuel System Electronic unit injection Electronic unit injection Less
Governor Type Adem™3 Adem™3 Less

Generator Set Dimensions

Length - Maximum 248.6 in 6319.4 mm Less
Width - Maximum 89.8 in 2281.2 mm Less
Height - Maximum 110.0 in 2794.0 mm Less
Dry Weight - Genset (maximum) 30790.0 lb 13970.0 kg Less

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 50°C (122°F)
  • Contact your Cat Dealer for specific ambient and altitude capabilities


  • UL2200
  • CSA Certified
  • IBC seismic certification
  • OSHPD pre-approval

One Safe Source

  • Components used in the generator set are selected at the design stage to provide optimum package 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

3512C (60 Hz) Standard Equipment

Air Inlet System
  • Air cleaner; single element canister type with service indicator

Air Inlet
  • Air Cleaner

  • Package mounted radiator

  • Exhaust flange outlet

  • Secondary fuel filter
  • Primary fuel filter with integral water separator
  • Fuel priming pump

  • Matched to the performance and output characteristics of Cat engines
  • IP23 Protection

Power Termination
  • Bus Bar

Control Panel
  • EMCP 4 Genset Controller

Control System
  • Alarm acknowledge
  • Over / under frequency (81 o/u)
  • Reverse Power (kW) (32)
  • Coolant temperature
  • kVAr (per phase, average & percent)
  • Overcurrent (50 / 51)
  • High coolant temperature
  • Environmental sealed front face
  • Reverse Reactive Power (kVAr) (32RV)
  • kVA (per phase, average & percent)
  • Volts (L-L & L-N)
  • Generator set packages include Caterpillar' s Voltage Regulator (IVR). IVR includes reactive droop capability, 3-phase voltage sensing, KVAR / PF modes, RFI suppression, min/max exciter. Limiter and exciter diode monitor
  • kW-hr (total)
  • kW (per phase, average & percent)
  • Low oil pressure
  • EMCP 4.2B
  • Digital indication for:
  • Engine cool-down timer
  • Generator mounted - rear facing
  • DC volts
  • 1 programmable relay outputs (Form C)
  • Overspeed
  • kVAr-hr (total)
  • 1 programmable digital outputs
  • Communications
  • Power Factor (per phase & average)
  • Oil pressure (psi, kPa or bar)
  • True RMS AC metering, 3-phase, +/-2% accuracy
  • Cat Connect
  • Customizable screens
  • Low coolant temperature
  • Over / under voltage (27 / 59)
  • 4 programmable relay outputs (Form A)
  • Accessory module data link
  • Warning / shutdown with common LED indication of shutdowns for:
  • Failure to start (overcrank)
  • Amps (per phase & average)
  • Auto / start / stop control
  • Controls:
  • Engine cycle crank
  • Customer data link (Modbus RTU)
  • Programmable protective relaying functions:
  • Text alarm / event descriptions
  • Emergency stop
  • Speed adjust
  • Number of I/O varies on options selected
  • Lamp test
  • RPM
  • 24 Volt DC operation
  • Emergency stop pushbutton
  • Low coolant level
  • Frequency (Hz)
  • Generator phase sequence
  • Load histogram feature
  • PLC functionality

Cooling System
  • Coolant level sensors (Not included with packages without radiator)
  • SCAC
  • Radiator fan and fan drive
  • Coolant drain line with valve
  • Fan and belt guards
  • Caterpillar extended life coolant (Not included with packages without radiator, installed SF44CTS

Exhaust System
  • Flanged faced outlet(s)
  • Dry exhaust manifold

Fuel System
  • Fuel cooler; not included with packages without radiator
  • Secondary fuel filters
  • Flexible fuel lines - shipped loose
  • Fuel priming pump

Generators and Attachments
  • Medium voltage:
  • Internal excitation
  • High voltage
  • Permanent magnet
  • Winding temperature detectors
  • NEMA Class H insulation, Class H temperature rise at 40C ambient (125C prime/150C standby)
  • Bus bar connections, right side extension box, bottom cable entry
  • Busbar connections, top center mounted, top cable entry
  • Low voltage:
  • Class H insulation, Class F temperature rise at 40C ambient (105C prime/130C standby)
  • NEMA Class H insulation, Class H temperature rise at 40C ambient (125C prime / 150C standby)
  • NEMA standard hole pattern
  • 3 phase brushless, salient pole
  • NEMA standard hole pattern
  • 6 Leads
  • Random wound
  • NEMA standard hole pattern
  • Form wound

Governing System

  • English

Lube System
  • Gear type lube oil pump
  • Oil filter, filler and dipstick
  • Fumes disposal
  • Lubricating oil
  • Oil drain lines and valve
  • Integral lube oil cooler

Mounting System
  • Rubber anti-vibration mounts (shipped loose)

Starting / Charging System
  • 45 Amp charging alternator
  • Battery and battery rack w/cables
  • Battery disconnect switch
  • 24 Volt electric starting motor

  • Flywheel and Flywheel housing-SAE No. 00
  • SAE Standard Rotation
  • Right hand servicing
  • Paint: Caterpillar yellow with high gloss black rails & radiator

3512C (60 Hz) Optional Equipment

Control Panels
  • EMCP 4.3, EMCP 4.4

  • Exhaust mufflers

Air Inlet System
  • Heavy duty air cleaner
  • Single element filter

  • Permanent magnet excitation (PMG)
  • Oversize and premium generators
  • Internal excitation (IE)
  • Anti-condensation heater

Cooling System
  • Coolant
  • Standard installed ATAAC radiators
  • Optional installed ATAAC radiators
  • Optional installed radiators
  • Water level switch gauges
  • Standard installed radiators

Power Termination
  • Circuit breakers, IEC compliant
  • Circuit breakers, UL listed

Exhaust System
  • Flanges
  • Flange and exhaust expanders
  • Y Adapters
  • Flexible fittings
  • Elbows
  • Mufflers

Fuel System
  • Primary fuel filter

  • US aid emblem

  • IBC isolators
  • Rubber anti-vibration mounts
  • Spring-type vibration isolator

Generators and Attachments
  • Differential current transformers (DCT) 15 kV class
  • RW, IE, 6 leads, Pitch 0.6667
  • Differential current transformers (DCT) 8.7 kV class
  • 1400, 1600, 2700 Frames
  • Space heater
  • Generator air cleaner
  • Generator conversion from IE to PM
  • Low Voltage: 380,440 / 480 Volts, 3 Phase, 1800 rpm

  • Jacket water heater
  • Air starting motor with control and silencer
  • Battery chargers
  • Charging alternator
  • Heavy-duty starting system
  • Oversize batteries

  • Wiring GP W/O cyl sensors
  • Pyrometer and thermocouples

Lube System
  • Prelube pumps
  • Oil level regulator
  • Oil drains
  • Lubrication oil in standard sump

Crankcase Protection
  • No explosion relief valves
  • No crankcase explosion relief valve
  • Explosion relief valve
  • Crankcase ventilation system

Mounting System
  • Puck style low efficiency isolators
  • IBC vibration isolators
  • Spring type vibration isolators

Power Connections
  • Cable entry - Right side
  • Center post buss bar
  • Rear power connections
  • Right side power connections
  • 2000, 2500,3200 Amp, 3 Pole, IEC Rated Circuit Breakers
  • 1600 ,2000, 2500, 3000, 4000 Amp, 3 Pole, UL-100% rated circuit breakers
  • Left side power connections
  • Six lead, six terminal option
  • 2000, 2500 Amp, 4 Pole, IEC Rated Circuit Breakers
  • Neutral ground connections
  • Grounding groups

Special Tests / Reports
  • Standard engine test charge
  • PGS test report @ 1.0 power factor
  • CSA certification
  • IBC seismic certification
  • Fuel consumption test
  • Torsional vibration analysis
  • Generator test report
  • Generator fuel consumption test
  • PGS test report @ 0.8 power factor

Starting / Charging System
  • 10 Amp battery charger
  • 24 Volt battery set - Dry
  • Engine barring device
  • 35 Amp battery charger
  • Air starting motor
  • Air pressure regulator
  • Batteries, racks and cables:
  • Jacket water heaters
  • Electric starting motors
  • Starter covers

Application Centre

Explore valuable resources for generator sizing, specification, and training materials. SpecSizer evaluates load types, collects data, and organises it to help you select the generator set that's best for you. Find product comparisons, technical data, product sizing, and more using our technical information portal (TIP) specifically created for consultants, architects, engineers, and owners.

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