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ISO120和ISO121贵的原因是因为二者的Isolation Voltage Cont Peak (DC) (V)和Isolation Voltage Pulse/Test Peak 很高，在环境比较恶劣的工业上面应用更加安全。ISO121的Isolation Voltage Cont Peak (DC) 达4950V，Isolation Voltage Pulse/Test Peak 达到5600V。
