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Guardian 40 kW Home Standby Generator with ATSUL Listed
Generac Guardian 40 kW 40,000 Watt Home Standby Generator

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See New 2006 Models at Generac_Guardian_Generators.htm 

Model #5221
  • Quiet, powerful, liquid-cooled engine fueled by natural gas or LP.
  • A standard weather protective enclosure protects generator from harmful weather and also effectively reduces exterior noise levels. Includes key locks for security.
  • Built-in charger maintains battery at optimum performance level.
  • Automatic safety shutdowns protect engine and generator in event of low oil level or pressure, high temperature, low coolant level, overspeed and/or overcrank.
  • Automatic seven-day exerciser runs the system for fifteen minutes each week to maintain to running condition.
  • Not included - 200-amp remote-mounted automatic transfer switch with service disconnect for fast and efficient unattended transfer to generator when utility source fails. Housed in a NEMA 3R outdoor rated enclosure.
Model 5221
Rated Power (kW)* LP 40 / NG 37
60 Hz Phase Single
Voltage 120/240V
Amps @ 120/240V, Single Phase 60Hz LP 333.3 / 166.6
NG 308.3 / 154.2
Engine / Alternator RPM 1800
Engine 3.9L V6
Fuel Natural gas or LP gas
UL 2200 Listed Yes
CSA Listed Yes
Main Line Circuit Breaker 200 Amp
(L" x W" x H")
76.1 x 33.5 x 42.2
Unit Wt. (lbs.)** 1400
* Natural gas and LP gas rating may decrease depending on btu content of local gas supply. Proper sizing of tank/piping is required to ensure full output.

Does not includes Transfer Switch

Start / Stop Control Cyclic cranking: 7 seconds on, 7 seconds rest. 90 seconds overcrank protection.
Automatic Low Oil Shutdown Standard
Overspeed Shutdown Standard, 70 Hz
Overcrank Protection Standard
Automatic Voltage Regulator with Over-Voltage Protection Standard
Engine Warmup 15 seconds
Engine Cool-Down 1 minute
Safety Fuse Standard
Starter Lockout Starter cannot re-engage until 5 seconds after engine has stopped
2 Amp Timed Trickle Battery Charger Standard
Auto Switch Utility failure/7 day exercise
Off Switch Stops unit. Power is removed. Control and charger still operate
Manual / Test Start with starter control, unit stays on. If utility fails, transfer to load takes place



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