1: Anti-spark protection When spark occur, the high sensitiveness spark protects electric system, cuts high frequency power immediatly to protect mould and material 2: Jamming prevention device Equipped with frequency stabilizer and high frequency magnetic leakage suppressor, this device leakage of electronic magnetic radiation to avoid jamming other electrical instruments such as televisions and radios etc 3: Safety device When the current exceeds its limite, the overload relay functions automatically to protect oscillation tube and rectififers, frequency deviation caused by misoperation is prevented
