熔断器选择系统计算公式

De-rating Factors
16

Derating Factors, Current
? Kt, Ambient Temperature : 40 C = 0.9 ? Ke, Thermal Connection : 70% = 0.95 ? Kv, Cooling Air : None = 1.0 ? Kf, Frequency : 50Hz = 1.0 ? Kb, Fuse Load Constant : = 1.0 Derating factor: Kt * Ke * Kv * Kf * Kb = 0.9*0.95*1.0*1.0*1.0 = 0.85
e
Minimum fuse rating: IN=423A/0.85 = 497A = 500A
Load
423A
G
17