GM5FB 300A Selective Protection DC250V Moulded Cas

GM5FB series selective protection moulded case DC circuit breakers are one of the new type circuit-breakers which have been developed using international advanced design and manufacturing technology, meanwhile, the standard of which circuit-breaker complied with is higher than international and domestic standard. The rated operational voltage of circuit-breakers is DC250V, which could be used in the circuit of DC rated current 63-800A, where the circuit-breakers take the role of infrequent closing/opening and starting-up. The circuit-breaker has the feature with the protection of overload and short-circuits short-time delay, so it can protect the distribution circuit and electric power system from damage. The function of short-circuit short-time delay has the feature with the characteristic of inverse time-delay, which has good current limiting capacity and the function of time-delay operation. It can prevent failure current from diffusion for the full-selective protection if which is used for the protection of important load in electric power system. FramesizeInm 315 Ratedcurrent(A): 300A Pole: 3P,4P RatedinsulationvoltageUi AC800V RatedoperationalvoltageUe DC250V RatedimpulsewithstandvoltageUimp 8kV Short-circuitBreakingCapacity Code R Ratedultimateshort-circuitbreakingcapacityIcu(DC250V) 65kA Ratedserviceshort-circuitbreakingcapacityIcs(DC250V) 50kA Short-circuitshort-timedelay Settingcurrentofrelease (5 7)In Trippingtimeofinversetime-delay 0.02s<Δt<0.08s Arcdistance 0mm Testdurability Mechanical/Electrical 7000/3000times Overalldimensions W(mm) 105 L(mm) 184 H(mm) 86 MountingType Fixedtype(frear:B) Internalaccessories (Cassetteaccessories) Auxiliarycontact(AX) √ Alarmcontact(AL) √ Shuntrelease(SHT) √ Externalaccessories Power-drivenoperatingdevice(P) √ Turninghandleoperatingdevice(Z) √ Connectingbar(L) √ Mechanicalinterlocking(MI) √