... , marathon , leroy somer, Yidaneng etc type Brushless , insulation class: H Frequency 3% Frequency at stable state 0.5% Frequency ... hours using 3)THE SPECIFICATIONS OF THE ALTERNATOR: The world first class alternator, up to the GB755, BS5000, VDE0530, IEC34-1 ... Standard pitch winding can be inhibit currents interruption· Insulation Class: H Protection class: H· Frequency at stable state: ≤1.0%· ...