NFPA 110 Level 1 is the most stringent emergency power supply system class — required for life-safety branch loads in hospitals (Type 10: must accept rated load within 10 seconds), egress lighting in essential occupancies, and select mission-critical industrial process loads. Level 1 compliance is a system-level designation that touches genset selection, ATS spec (often delayed-transition with bypass-isolation), fuel storage capacity (96 hours typical), and an annual load-bank test regime.
230 models in this category.
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800 kW Cat diesel with 3412C V-12. Updated 3400-series with EMCP 4 controls. Proven reliability.
800 kW standby · Diesel · Liquid-cooled
800 kW standby for data centers, hospitals, and campuses with existing 3400-series fleet.
800 kW standby diesel generator with Cat 3412C V12 engine, 27.0L displacement. The current-generation 3412 with upgraded controls and improved fuel efficiency.
Tier 23-phasedata-centerhospital
Caterpillar
Cat 3508
850 kW Cat diesel with 3508 V-8. 34.5L between the 3412 and 3512. Proven 3500-series reliability.
850 kW standby · Diesel · Liquid-cooled
850 kW standby for industrial facilities, campuses, and mining operations with 3500-series standardization.
850 kW standby diesel generator with Cat 3508 V8 engine, 34.5L displacement. Purpose-built for industrial facilities, mining operations, and mission-critical power.
Tier 23-phaseindustrialcampus
Caterpillar
Cat 3508B
1 MW Cat diesel with 3508B V-8. Upgraded 3500-series for data centers. Megawatt from 8 cylinders.
1 MW standby · Diesel · Liquid-cooled
1 MW standby for data centers, hospitals, and mission-critical facilities preferring 3500-series platform.
1000 kW standby diesel generator with Cat 3508B V8 engine, 34.5L displacement. Built for data centers, hospitals, and paralleling arrays requiring 1 MW per unit.
Tier 23-phasedata-centerhospital
Caterpillar
Cat 3512
1000 kW diesel with CAT 3512 V-12. Best resale value in class. ~200 US dealers with parts availability back decades.
1 MW standby · Diesel · Liquid-cooled
1000 kW diesel standby for Tier III data centers, large hospitals, and industrial campuses with CAT fleet.
1000-1400 kVA diesel generator with Cat 3512 V-12 engine. 51.8L displacement, Woodward governor, continuous/prime/standby ratings.
3-phasecommercial-standbyindustrial
Caterpillar
Cat 3512B
1500 kW diesel with CAT 3512B V-12. Best resale -- retains 15-25% more than Cummins/MTU. Deepest parts network.
1.5 MW standby · Diesel · Liquid-cooled
1500 kW diesel standby for Tier III+ data centers, large hospitals, and critical infrastructure.
1230-1500 kW diesel generator with Cat 3512B V-12 engine. EUI fuel system, EMCP 4.2B controller, mission-critical and standby ratings.
3-phasecommercial-standbymission-critical
Caterpillar
Cat 3516B
2000 kW diesel with CAT 3516B V-16. Best resale value in class. Paralleling for multi-MW. ~200 US dealers.
2 MW standby · Diesel · Liquid-cooled
2000 kW diesel standby for Tier IV data centers, large hospitals, and campus-scale critical infrastructure.
1 MW Cat diesel with C32 V-12. Megawatt-class at GC pricing. Medium voltage available. Paralleling ready.
1 MW standby · Diesel · Liquid-cooled
1 MW standby for data centers, hospitals, and paralleling arrays needing megawatt-class GC power.
1000 kW diesel standby generator from Cat's GC value-engineered line. C32 V-12 engine with simplified controls for mission-critical standby.
Tier 23-phasestandbydata-center
Caterpillar
Cat D1100 GC
1.1 MW Cat diesel with C32 V-12. Above-megawatt with 1 MW prime. GC value for mission-critical.
1.1 MW standby · Diesel · Liquid-cooled
1.1 MW standby for data centers needing above-megawatt capacity with GC value proposition.
1100 kW diesel standby generator from Cat's GC value-engineered line. C32 V-12 engine with simplified controls for mission-critical standby.
Tier 23-phasestandbydata-center
Caterpillar
Cat D1250 GC
1.25 MW Cat diesel with evolved C32B V-12. Flagship GC model. Maximum single-unit GC power.
1.3 MW standby · Diesel · Liquid-cooled
1.25 MW standby for data centers and hospitals needing maximum GC single-unit capacity.
1250 kW diesel standby generator from Cat's GC value-engineered line. C32B V-12 engine with simplified controls for mission-critical standby.
Tier 23-phasestandbydata-center
Caterpillar
Cat D1500
1.5 MW Cat diesel with C32B V-12. Cat's newest flagship. Maximum power density for data centers.
1.5 MW standby · Diesel · Liquid-cooled
1.5 MW standby for Tier III+ data centers and large hospitals needing maximum single-unit density.
1500 kW standby diesel generator with Cat C32B V12 engine, 32.1L displacement. Cat's newest 1.5 MW platform — maximum power density for space-constrained data centers.
Tier 23-phasedata-centerhospital
Caterpillar
Caterpillar 3406
350 kW diesel with legendary CAT 3406 engine. Best resale -- retains 15-25% more than Cummins/MTU. Parts back to 1995.
350 kW standby · Diesel · Liquid-cooled
350 kW diesel standby for industrial plants, water treatment, and large commercial with fleet standardization.
The Caterpillar 3406C is a 275-400 kW diesel generator built on the legendary 14.64L inline-6. Legacy platform with one of the broadest parts ecosystems in the diesel industry. Specs from OEM data sheet.
3-phasecommercial-standbyindustrial
Caterpillar
Caterpillar 3412
720 kW diesel with legendary CAT 3412 engine. Best resale -- retains 15-25% more than competitors. Parts back to 1995.
720 kW standby · Diesel · Liquid-cooled
720 kW diesel standby for large industrial, hospitals, and mission-critical facilities with CAT fleet standardization.
The Caterpillar 3412C is a 680-900 kVA diesel generator built on the 27.02L V12 engine. ADEM A5 governor. Fuel: 45.3 gal/hr at full load. Legacy platform for hospitals, campuses, and industrial sites.
3-phasehospital-largeindustrial
Caterpillar
Caterpillar 3512C
1500 kW diesel with CAT 3512C V-12. EPA Tier 4 Final. Best resale value in class. ~200 US dealers.
1.5 MW standby · Diesel · Liquid-cooled
1500 kW diesel standby for Tier III+ data centers, hospitals, and emission-sensitive industrial sites.
The Caterpillar 3512C is a 1500 kW standby diesel generator. 51.8L V12 ATAAC, 14.7:1 compression, EPA Tier 2. Fuel: 104.6 gal/hr at full load. Medium-voltage outputs to 13,800V for mission-critical applications.
Tier 23-phasedata-centerhospital-large
Caterpillar
Caterpillar C13
350 kW diesel with CAT C13 ACERT inline-6. Best resale -- retains 15-25% more than competitors. ~200 US dealers.
350 kW standby · Diesel · Liquid-cooled
350 kW diesel standby for hospitals, large commercial, and industrial with CAT fleet standardization.
The Caterpillar C13 ACERT is a 350 kW standby diesel generator with EPA Tier 3 certification. 12.5L inline-6 with MEUI injection. Fuel consumption 24.9 gal/hr at full load. Complete specs and service reference.
Tier 33-phasecommercial-standbyhospital-medium
Caterpillar
Caterpillar C18
600 kW diesel with CAT C18 ACERT inline-6. Best resale -- retains 15-25% more than Cummins/MTU. ~200 US dealers.
600 kW standby · Diesel · Liquid-cooled
600 kW diesel standby for large data centers, hospitals, and industrial plants with CAT fleet.
The Caterpillar C18 ACERT is a 600 kW standby diesel generator with EPA Tier 2 certification. 18.1L inline-6 with MEUI injection. Fuel: 42.7 gal/hr at full load. Supports 4160V medium-voltage for hospital and campus applications.
Tier 23-phasehospital-mediumcampus
Caterpillar
Caterpillar C7
200 kW diesel with CAT C7 ACERT inline-6. Best resale value in class. ~200 US dealers. Compact footprint.
200 kW standby · Diesel · Liquid-cooled
200 kW diesel standby for retail, telecom, and small commercial with CAT fleet standardization.
The Caterpillar C7.1 ACERT is a 200 kW standby diesel generator with EPA Tier 3 certification. 7.01L inline-6 with MEUI fuel injection. Compact standby power for small commercial and retail applications.
Tier 33-phasecommercial-standbyretail
Caterpillar
Caterpillar C9
250 kW diesel with CAT C9 ACERT inline-6. Best resale -- retains 15-25% more than competitors. ~200 US dealers.
250 kW standby · Diesel · Liquid-cooled
250 kW diesel standby for mid-size commercial, schools, and light-industrial with CAT fleet.
The Caterpillar C9 ACERT is a 250 kW standby diesel generator with EPA Tier 3 emissions certification. 8.8L inline-6 with MEUI fuel injection. Ideal for retail, telecom, and light-industrial standby applications.
Tier 33-phasecommercial-standbyretail
Caterpillar
Caterpillar G3406
300 kW natural gas with CAT G3406 inline-6. No diesel storage needed. Legacy platform with deep parts availability.
300 kW standby · Natural Gas · Liquid-cooled
300 kW natural gas standby for hospitals, commercial campuses, and facilities on gas mains.
The Caterpillar G3406 is a natural gas standby generator built on the 14.6L G3406 TA inline-6 spark-ignited engine. No diesel fuel storage required. Legacy platform for hospitals, campuses, and commercial facilities.
512 kW natural gas with CAT G3412 V-12. No diesel infrastructure needed. EMCP 4 controller. ~200 US dealers.
512 kW standby · Natural Gas · Liquid-cooled
512 kW natural gas standby for large hospitals, campuses, and data centers on gas mains.
The Caterpillar G3412 is a 512 kW standby natural gas generator built on the 27L V12 G3412C engine. EPA Subpart JJJJ certified. EMCP 4 controller. Dry weight 14,330 lb. Complete specs from OEM sheet.
