... ring or closed-loop control system electron cabinet* public utilities* electrical power system* petroleum chemical industry* ships, petroleum oil drilling ... :IEC439,GB7251-1997,JB/T9661-1999* Rated Voltage:380V(660V)* Rated insulation voltage:660V(1000V)*Rated current: 5500A(IP00),4700A(IP30 ... standard90KA, enhanced 130KA*Degree of protection: IP30,IP40,IP54 : MNS low-voltage switchgear cabinet