请教:UL1449与UL497B有何区别?谢谢

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LV.3

2007-03-09 17:48

UL 497B Protectors for Data Communications and Fire Alarm Circuits

UL 1449 Surge Protective Devices

LV.1

2007-03-13 09:28

@dove111222

UL497BProtectorsforDataCommunicationsandFireAlarmCircuitsUL1449SurgeProtectiveDevices

谢谢!那请问还有497A又是什么标准?多谢

LV.3

2007-03-13 15:02

@jsgnswg

谢谢!那请问还有497A又是什么标准?多谢

UL 497A Secondary Protectors for Communications Circuits

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