Frequency CBQ59 series explosion-proof box (Ⅱ B) 
 Application Scope 
 1 and Zone 2 dangerous places. 
 IIA, IIB, type explosive atmosphere. 

 1 through current protection, short circuit protection. Over-voltage protection, under voltage protection, low voltage protection and power protection 
 2 to digital display or pointer shows the frequency, speed and load rate and current 
 3 copper or cable wiring 
 4 comply with GB3836-2000, IEC60079 standard request