Nine models of generators in the series are available, ranging from 2500 to 6600 watts, weighing between 95 and 206 lb. Six models ranging from 3800 to 6600 watts feature a central ground fault circuit interrupter system for all receptacles, including 120V and 240V-twist locks. GFCI sensor protects by monitoring all outlets for current leakage and tripping the main circuit breaker in the event of a current leak. Wacker Neuson.