Briggs & Stratton 12,000-Watt Automatic Air Cooled Standby Generator with 150 Amp Transfer Switch

Item # 3581739 | Briggs & Stratton Part # 040534 | UPC Code 011675405342 | UNSPSC Code 26111600
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Product Overview

This Briggs & Stratton standby generator protects your home and family with affordable, reliable Briggs & Stratton backup power. This generator is 50% smaller and 60% quieter than our previous model. Its streamlined design meets the power needs of your whole house, with a more compact, affordable unit. This home standby generator includes outdoor/indoor NEMA 3R rated automatic transfer switch for easy installation. You can truly power more for less with this little powerhouse.

  • Thanks to symphony 2 power management system, a smaller home generator system by Briggs & Stratton can meet all your needs and save you money in the process
  • 12kW with symphony 2 power management can manage a home, up to 5,500 sq. ft. with a 4-Ton air conditioner saving you thousands less than a previously required 20kW
  • Compliancy with the NFPA 37 standard means it can be placed as close as 18 in. from your home for flexible placement 3 options - perfect for tight lot lines
  • Rated for operation in areas with low natural gas pressure
  • Home generator can operate at 3.5 in. to 7 in. water column
  • Comprehensive 5-year parts, labor and travel limited warranty

Proposition 65 Information

Prop65 Warning Icon WARNING: Cancer and Reproductive Harm


Built-in inverter
CARB Compliant
CARB Compliant
Automatic Voltage Regulation, Dual Fuel, Hour Meter, Low Oil Shutdown, Overload Protection
Fuel Tank Capacity (gallons)
Automatic Transfer Switch
Number of Outlets
Power Type
Natural Gas, Propane Liquid
Product Height (in.)
Product Length (in.)
Product Weight (lb.)
Product Width (in.)
Running Wattage
Standard Color Family


5-year parts, labor, and travel limited warranty