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Producing reliable power from 1230 to 1500 ekW at 60 Hz, our 3512B 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 offer both low fuel consumption and low emission systems.

Generator Set Specifications

Minimum Rating 1230 ekW 1230 ekW Less
Maximum Rating 1500 ekW 1500 ekW Less
Emissions/Fuel Strategy Low Fuel, Low Emissions Low Fuel, Low Emissions 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 3512B TA, V-12, 4-Stroke Water-Cooled Diesel 3512B TA, 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 3573.55 in 58.56 l Less
Compression Ratio 14.0:1 Std 15.5:1 HD 14.0:1 Std 15.5:1 HD 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 221.9 in 5637.5 mm Less
Width - Maximum 90.0 in 2286.0 mm Less
Height - Maximum 93.2 in 2367.2 mm Less
Dry Weight - Genset (minimum) 24430.0 lb 25090.0 kg Less
Dry Weight - Genset (maximum) 25090.0 lb 11380.0 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

3512B (60 Hz) Standard Equipment

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

Air Inlet
  • Air Cleaner

  • Package mounted radiator (except C175)

  • Exhaust flange outlet

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

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

Power Termination
  • Bus Bar

Control Panel
  • EMCP 4 Genset Controller

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

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

Exhaust System
  • Flanged faced outlet(s)
  • Dry Exhaust Manifold

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

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

Governing System

  • English

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

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

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

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

3512B (60 Hz) Optional Equipment

  • Exhaust mufflers

Control Panels
  • EMCP 4.3, EMCP 4.4
  • EMCP 4.4
  • EMCP 4.4
  • Load share module
  • Remote monitoring software
  • EMCP 4.3
  • EMCP 4.2
  • EMCP 4.2B
  • Digital I/O module
  • Generator temperature monitoring & protection

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

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

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

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

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

Fuel System
  • Primary fuel filter

  • US aid emblem
  • EEC Declaration of Conformity
  • Seismic Certification per applicable building codes: IBC 2000, IBC 2003, IBC 2006, IBC 2009, CBC 2007
  • The following options are based on regional and product configuration:
  • Integral & sub-base fuel tanks
  • EU Certificate of Conformance (CE)
  • UL 2200 package
  • Enclosures: sound attenuated, weather protective
  • Integral & sub-base UL listed dual wall fuel tanks
  • CSA Certification
  • Automatic transfer switches (ATS)

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

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

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

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

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

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

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

Power Connections
  • 6 Leads, 6 terminal option
  • 1600 ,2000, 2500, 3000, 4000 Amp, 3 Pole, UL-100% rated circuit breakers
  • 2000, 2500,3200 Amp, 3 Pole, IEC Rated Circuit Breakers
  • Left side power connections
  • Cable entry - Right side
  • Grounding groups
  • Right side power connections
  • 2000, 2500 Amp, 4 Pole, IEC Rated Circuit Breakers
  • Rear power connections
  • Neutral ground connections
  • Center post buss bar

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

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

Application Center

Explore valuable resources for generator sizing, specification, and training materials. SpecSizer evaluates load types, collects data, and organizes 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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