3512B (60 Hz)

3512B Diesel Generator Set

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% rated load in one step. Generator sets offer both low fuel consumption and low emission systems.

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

Cat ECS 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


  • UL 2200 Listed
  • CSA
  • 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

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
Exhaust System
  • Exhaust flange outlet
  • Dry exhaust manifold
  • Flanged faced outlet(s)
  • IP23 Protection
  • Matched to the performance and output characteristics of Cat engines
Power Termination
  • Busbar
Control Panel
  • Cat ECS Genset controller
Control System
  • Alarm acknowledge
  • kW-hr (total)
  • Lamp test
  • Over/under voltage (27 / 59)
  • Digital indication for:
  • DC volts
  • PLC functionality
  • Speed adjust
  • 4 Programmable relay outputs (Form A)?
  • Text alarm/event descriptions
  • Warning/shutdown with common LED indication of shutdowns for:
  • Engine cycle crank
  • Emergency stop
  • Auto/start/stop control
  • RPM
  • Reverse power (kW) (32)
  • True RMS AC metering, 3-phase, +/-2% accuracy
  • Accessory module data link
  • Low coolant level
  • kVAr-hr (total)
  • kVAr (per phase, average & percent)
  • 1 Programmable relay outputs (Form C)
  • Over/under frequency (81 o/u)
  • Low oil pressure
  • Amps (per phase & average)
  • Failure to start (overcrank)
  • Cat ECS 100
  • Controls:
  • High coolant temperature
  • Communications
  • Number of I/O varies on options selected
  • 24 Volt DC operation
  • Engine cool-down timer
  • Low coolant temperature
  • Generator phase sequence
  • Frequency (Hz)
  • Volts (L-L & L-N)
  • Reverse reactive power (kVAr) (32RV)
  • Oil pressure (psi, kPa or bar)
  • Customizable screens
  • 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
  • Load histogram feature
  • 1 Programmable digital outputs
  • Customer data link (Modbus RTU)
  • Overspeed
  • Environmental sealed front face
  • Coolant temperature
  • kW (per phase, average & percent)
  • Programmable protective relaying functions:
  • kVA (per phase, average & percent)
  • Power factor (per phase & average)
  • Emergency stop pushbutton
  • Generator mounted - rear facing
  • Cat connect
  • Overcurrent (50 / 51)
Cooling System
  • Package mounted radiator
  • Radiator fan and fan drive
  • Fan and belt guards
  • Coolant drain line with valve
  • Caterpillar extended life coolant (Not included with packages without radiator, installed SF44CTS
  • Coolant level sensors (Not included with packages without radiator)
  • SCAC
Fuel System
  • Primary fuel filter with integral water separator
  • Secondary fuel filters
  • Flexible fuel lines - shipped loose
  • Fuel priming pump
  • Fuel cooler; not included with packages without radiator
Generators and Attachments
  • Low voltage:
  • Random wound
  • 6 Leads
  • NEMA standard hole pattern
  • High voltage
  • Busbar connections, right side extension box, bottom cable entry
  • NEMA Class H insulation system, Class H temperature rise at 40C ambient
    (125C prime / 150C standby)
  • Permanent magnet excitation (PMG)
  • NEMA standard hole pattern
  • Medium voltage:
  • Busbar connections, top center mounted, top cable entry
  • NEMA Class H insulation system, Class H temperature rise at 40C ambient
    (125C prime / 150C standby)
  • Winding temperature detectors
  • Form wound
  • 3 Phase brushless, Salient pole
  • Class H insulation, Class F temperature rise at 40C ambient (105C prime / 130C standby)
  • Internal excitation (IE)
Governing System
  • Parts book
Lube System
  • Lubricating oil
  • Gear type lube oil pump
  • Oil drain lines and valve
  • Fumes disposal
  • Integral lube Oil cooler
  • Oil filter, filler and dipstick
Mounting System
  • Rubber anti-vibration mounts - shipped loose
Starting / Charging System
  • Battery disconnect switch
  • Battery and battery rack w/cables
  • 45 Amp Charging alternator
  • 24 Volt electric starting motor
  • Paint - Caterpillar yellow with high gloss black rails & radiator
  • Flywheel and Flywheel housing-SAE No. 00
  • Right hand servicing
  • SAE standard rotation
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