1. Shell welded by steel plate, the surface high-voltage electrostatic spray; 
 2. Built-in self-coupling transformer, AC contactors, time relays, thermal relays, current transformers, ammeters, voltmeters, switches, lights, etc. 
 3. Products of overload, short circuit, loss of pressure, phase protection function; 
 4. Steel cable wiring! 
 For 1 and Zone 2 dangerous places; 
 For IIA, IIB class, temperature class T1-T6 risk atmosphere. 
 Protection class: IP54