3512B (60 Hz) 1500 kW with Upgradeable Package

3512B Diesel Generator Set

Our industrial diesel generators produce reliable power from 1230 to 1500 kW at 60 Hz. The 3512B diesel gensets are made to provide continuous power solutions for your business operation as well as supply standby and emergency power. Diesel engines are parallelable and meet prime applications. We’ve designed each to ISO 8528-5 transient response requirements and to accept 100% rated load in one step. Cat® generators are available in low fuel consumption and low emissions configurations.
Q. Can we burn HVO (hydrotreated vegetable oil) in this generator to help achieve our Sustainability goals?
A. Yes, the 3512B can burn HVO to help reduce emissions.
Q. Does the Cat generator meet 10 second starting requirements?
A. Yes, with the appropriate configuration our generators are capable of 10 second starting to meet emergency needs or customer requirements.
Q. Does this generator comply with ISO 8528 guidelines?
A. Yes, the 3512B, like all of our generators, is tested in accordance with the load steps outlined in with ISO 8528, Part 5.
Q. Is this generator noisy?
A. We offer a number of options for sound attenuation including silencers and sound attenuated enclosures for many of our generators to reduce the dB(A) levels.
Q. Where can I obtain replacement parts for a Cat generator?
A. Replacement spares are available from Cat dealers in over 200 countries worldwide.

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


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

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

Air Inlet System
  • Air cleaner; single element canister type with service indicator
Control System
  • True RMS AC metering, 3-phase, +/-2% accuracy
Control Panel
  • DC volts
  • 24 Volt DC operation
  • kVA (per phase, average & percent)
  • Engine cool-down timer
  • Coolant temperature
  • kW-hr (total)
  • Amps (per phase & average)
  • Over/under frequency (81 o/u)
  • Text alarm/event descriptions
  • Accessory module data link
  • Alarm acknowledge
  • Warning/shutdown with common LED indication of shutdowns for:
  • Auto/start/stop control
  • Controls:
  • Failure to start (overcrank)
  • Generator mounted - rear facing
  • kVAr (per phase, average & percent)
  • kVAr-hr (total)
  • Reverse reactive power (kVAr) (32RV)
  • Volts (L-L & L-N)
  • Serial annunciator module data link
  • 4 programmable relay outputs (Form A)
  • Lamp test
  • Operating hours
  • Overcurrent (50/51)
  • kW (per phase, average & percent)
  • Communications:
  • 6 programmable digital inputs
  • RPM
  • Engine cycle crank
  • 2 Programmable relay outputs (Form C)
  • IVR includes reactive droop capability, 3-phase voltage sensing
  • High coolant temperature
  • Digital indication for:
  • Environmental sealed front face
  • Power factor (per phase & average)
  • Speed adjust
  • Emergency stop pushbutton
  • Limiter and exciter diode monitor
  • Low oil pressure
  • EMCP 4.2B
  • Low coolant level
  • 2 Programmable digital outputs
  • KVAR/PF modes, RFI suppression, min/max exciter
  • Oil pressure (psi, kPa or bar)
  • Customer data link (Modbus RTU)
  • True RMS AC metering, 3-phase, +/-2% accuracy
  • Overspeed
  • Frequency (Hz)
  • Emergency stop
  • Generator set packages include Caterpillar's voltage regulator (IVR)
  • Reverse power (kW) (32)
  • Low coolant temperature
  • Generator phase sequence
  • Programmable protective relaying functions:
  • Over/under voltage (27/59)
Cooling System
  • Caterpillar extended life coolant. (Not included with packages without radiator, installed SF44CTS, shipped loose radiators or heat exchangers)
  • Fan and belt guards
  • JWAC
  • Coolant drain line with valve
  • Coolant level sensors (Not included with packages without radiator)
  • Dry exhaust manifold
  • Flanged faced outlet(s)
Fuel System
  • Fuel cooler; not included with packages without radiator
  • Fuel priming pump
  • Secondary fuel filters
  • Flexible fuel lines - shipped loose
Generators and Attachments
  • NEMA Class H insulation
  • Winding temperature detectors
  • Internal excitation (IE) or Permanent magnet excitation (PMG)
  • LV
  • 6 Lead
  • 60 Hz models: NEMA standard hole pattern
  • Class H temperature rise at 40C ambient (125C prime / 150C standby)
  • 3 Phase brushless, Salient pole
  • Busbar connections, top center mounted, top cable entry
  • Random wound
Governing System
  • Woodward 2301A isochronous governor
Lube System
  • Oil drain lines and valve
  • Lubricating oil
  • Integral lube Oil cooler
  • Fumes disposal
  • Gear type lube oil pump
  • Oil filter, filler and dipstick
Mounting System
  • Rails - engine/generator/radiator mounting
  • Rubber anti-vibration mounts - shipped loose
Starting / Charging System
  • Battery disconnect switch
  • Battery and battery rack w/cables
  • 24-Volt electric starting motor
  • 50 Amp Charging alternator
  • SAE standard rotation
  • Paint - Caterpillar yellow with high gloss black rails & radiator
  • Flywheel and Flywheel housing-SAE No. 00
  • RH service

Additional information

Offering Type

Generator Set Specifications - Standby Rating

1500/1400 kW

Generator Set Specifications - Prime Power Rating

1360/1275 kW

Generator Set Specifications - Emissions/Fuel Strategy

Low Fuel, Low Emissions

Generator Set Specifications - Voltage

380 to 480 Volts

Generator Set Specifications - Frequency

60 Hz

Generator Set Specifications - Speed

1800 rpm

Generator Set Specifications - Duty Cycle

Standby, Mission Critical, Prime, Continuous

Generator Set Specifications - Maximum Rating

1500 kW

Generator Set Specifications - Minimum Rating

1230 kW

Engine Specifications - Engine Model

3512B TA, V-12, 4-Stroke Water-Cooled Diesel

Engine Specifications - Bore

170 mm ( 6.69 in )

Engine Specifications - Stroke

190 mm ( 7.48 in )

Engine Specifications - Displacement

3161.03 l ( 51.8 in³ )

Engine Specifications - Compression Ratio

14.0:1 Std 15.5:1 HD

Engine Specifications - Aspiration


Engine Specifications - Fuel System

Electronic Unit Injection

Engine Specifications - Governor Type


Generator Set Dimensions - Length - Maximum

5279 mm ( 207.8 in )

Generator Set Dimensions - Width - Maximum

2286 mm ( 90 in )

Generator Set Dimensions - Height - Maximum

2409 mm ( 94.9 in )

Generator Set Dimensions - Dry Weight - Genset (minimum)

11021 kg ( 24297 lb )

Generator Set Dimensions - Dry Weight - Genset (maximum)

11321 kg ( 24959 lb )

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