Cummins RS150 Quiet Connect™ 150kW Commercial Standby Generator, 120/208V 3-Phase

Is the Cummins RS150 the Right 150kW Standby Generator for Your Facility?

The Cummins RS150 Quiet Connect (part number A063A483) is a 150kW liquid-cooled standby generator built for 120/208V three-phase service. It delivers 520.3 amps at full load, starts and transfers automatically under its PowerCommand 2.3 control, and is capable of meeting NFPA 110 requirements when equipped with the necessary accessories and properly installed. It runs on natural gas; if your site needs propane, we'll confirm availability with Cummins on your quote.

It's the top of the Quiet Connect range, built on an 8.9L engine for facilities with large three-phase loads: grocery and food service, assisted living, larger medical practices, municipal buildings and light manufacturing.

Mighty Generators supplies the RS150 by quote. Cummins builds it to order and ships it freight direct, typically in 5 to 6 weeks, so you can have the pad, fuel line and transfer switch ready while it's in production.

Cummins RS150 at a Glance

• Standby rating: 150 kW, 60 Hz
• Electrical: 120/208V three-phase, 520.3 A rated, a 600 A circuit breaker
• Engine: Cummins 8.9L turbocharged and aftercooled in-line 6-cylinder, 1800 rpm
• Fuel: Natural gas; propane availability confirmed with Cummins on your quote
• Controller: Cummins PowerCommand 2.3
• Sound: 71.3 dB(A) at 23 ft (7 m) with the optional Sound Level 2 enclosure
• Size and weight: 143 x 40 x 72 in (L x W x H), 3,915 lb
• Code compliance: UL 2200, EPA stationary emergency (40 CFR 60), IBC seismic, NFPA 110 capable

Cummins RS150 Features and Performance

Engine and Fuel

The Cummins 8.9L turbocharged and aftercooled in-line 6-cylinder runs at 1800 rpm with an isochronous electronic governor, so frequency holds steady as loads switch on and off. It runs on natural gas, and propane availability is confirmed with Cummins on your quote. At full load it uses 1,915 cubic feet per hour of natural gas.

PowerCommand 2.3 Control

PowerCommand handles automatic remote starting and stopping, voltage and frequency regulation, alarm and status display, output metering and automatic shutdown when it detects a fault. Voltage regulation is ±1.0% from no load to full load, and random frequency variation is ±0.25% at 60 Hz (ISO 8528-1 Class G3), which matters when the loads include IT equipment, variable-speed drives or medical devices. The flexible exercise mode lets you choose when and how long the generator runs its test cycle, down to as little as 2 minutes every 6 months, which cuts fuel use and noise on site.

Enclosure and Weather

The powder-coated aluminum enclosure comes in Sound Level 1 trim with the muffler installed, in green. Cummins has evaluated it to withstand 180 mph wind loads under ASCE 7-10, and hinged doors open for service. Cummins publishes its sound rating with the optional Sound Level 2 upgrade kit fitted: 71.3 dB(A) at 23 ft (7 m). If a property line or local noise ordinance is tight, quote the upgrade kit with the generator. Cummins designs the RS150 to start in temperatures as low as -40°F, and the factory coolant heater keeps the engine ready to take load.

Where the Cummins RS150 Fits

Start with the electrical service. This RS150 is wired for 120/208V three-phase. Cummins builds the RS150 for 120/240V single-phase, 120/240V three-phase and 277/480V three-phase service too, each under its own part number, so if your building has one of those services, ask us to quote the matching model instead of this one.

Typical applications for a three-phase unit this size:

• Grocery and food service operations with large refrigeration loads
• Assisted living and larger medical facilities planning an NFPA 110 emergency system
• Municipal buildings, public works and schools on 208V three-phase service
• Light manufacturing with significant three-phase motor and process loads

Size the generator from the load, not the square footage. A licensed electrician or engineer should run a load calculation that accounts for motor starting, HVAC and anything on variable-speed drives, and our team can match that number to the right RS model.

Cummins RS150 vs Nearby Quiet Connect Sizes

If your calculated load lands close to 150kW, it's worth looking one size either side before you commit. Here's how the RS150 compares with RS125 in the same 120/208V three-phase configuration.

The RS25 to RS40 share a compact enclosure and a 2.4L four-cylinder engine. The RS50 to RS100 move to a 5.9L six-cylinder in a 118.7 inch enclosure, and the RS125 and RS150 use an 8.9L engine in a 143 inch green enclosure with PowerCommand 2.3 control.

Planning the Cummins RS150 Installation

• Transfer switch: sold separately and required. Cummins offers automatic transfer switches in a range of amperages, including service entrance models, all listed to UL 1008.
• Delivery and pad: the unit weighs 3,915 lb and ships on a pallet, so plan unloading equipment and a pad sized for its 143 x 40 x 72 inch footprint.
• Elevation and heat: Full rated output up to 2,540 ft (775 m) at up to 104°F (40°C); derate 4.25% per 985 ft above that.
• Accessories worth quoting: Sound Level 1 to Sound Level 2 enclosure upgrade kit, PowerCommand 500 internet monitoring device, alternator heater, maintenance and service kit.

Cummins RS150 Specifications

Standard Equipment on the Cummins Spec Sheet

• Coolant heater
• Battery rack
• Operator's manual and installation manual

Confirm the final configuration and any accessories on your written quote.

Frequently Asked Questions About the Cummins RS150

What electrical service does the Cummins RS150 need?

This RS150 (part number A063A483) is built for 120/208V three-phase service and is rated 520.3 amps at full load, with a 600 A circuit breaker. Cummins also builds the RS150 for 120/240V single-phase, 120/240V three-phase and 277/480V three-phase service under different part numbers, so match the generator to your building's service before you order.

What fuel does the Cummins RS150 use?

The RS150 runs on natural gas. Cummins' published fuel data for this model is inconsistent about propane, so if your site only has propane, tell us when you request a quote and we'll confirm it with Cummins before quoting. At full load it uses 1,915 cubic feet of natural gas per hour, so your gas utility will need to confirm the meter and service line can deliver that volume.

Is the Cummins RS150 suitable for an NFPA 110 emergency power system?

Cummins states the RS150 is capable of meeting NFPA 110 requirements when it's equipped with the necessary accessories and properly installed. It's certified to UL 2200 and EPA stationary emergency emissions rules (40 CFR 60) and meets IBC seismic requirements, and its PowerCommand control supports automatic remote start and shutdown on a detected fault. Your engineer of record or the authority having jurisdiction decides what level your facility needs.

How loud is the Cummins RS150?

With the optional Sound Level 2 upgrade kit, Cummins rates the RS150 at 71.3 dB(A) at 23 ft (7 m). The generator ships in a Sound Level 1 aluminum enclosure with the muffler installed, and the Sound Level 2 kit can be added where a property line or noise ordinance calls for it.

Should I choose the Cummins RS150 or the RS125?

Choose on calculated load and growth. The RS150 is rated 150kW and 520.3 amps at 120/208V three-phase; the RS125 is rated 125kW and 433.6 amps in the same 143 x 40 x 72 inch, 3,915 lb package. If your load calculation comes in well under 150kW, the RS125 may cover it and burns less fuel: 1,665.6 against 1,915 cubic feet of natural gas per hour at full load. Send us your load list with a quote request and we'll recommend the size.

Warranty and Support

Cummins backs the RS150 with a 2-year base warranty when it's used in an EPA stationary emergency (standby) application, and extended Cummins warranties are available. Warranty coverage and service come from Cummins and its certified distributor and dealer network. Mighty Generators is an authorized Cummins dealer: we'll check the configuration against your electrical service, quote the transfer switch and accessories, and coordinate freight to your site.

Ready for a quote? Use Request a Quote on this page, or call (888) 775-9048 with your service voltage and a list of the loads you need to carry.