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GB/T 2501-90 GB/T 2501-90 1990-11-061991-7-01 IEC 5361976 1 660V 2 GB 2900.1 GB 3805 GB 4208 GB 4708 3 3.1basic insulation 3.2supplementary insulation 1/5GB/T 2501-90 2020/7/16file///C/Users/ThinkPad/AppData/Local/Temp/22.htm 3.3double insulation 3.4reinforced insulation 3.5safety impedance 3.6safety extra-low voltage SELV 50V GB 3805 4 AA1 GB 4208 2/5GB/T 2501-90 2020/7/16file///C/Users/ThinkPad/AppData/Local/Temp/22.htm 4.10 4.2 0 4.3 3/5GB/T 2501-90 2020/7/16file///C/Users/ThinkPad/AppData/Local/Temp/22.htm 4.4 SELV A A1A1 A1 0 4/5GB/T 2501-90 2020/7/16file///C/Users/ThinkPad/AppData/Local/Temp/22.htm 5/5GB/T 2501-90 2020/7/16file///C/Users/ThinkPad/AppData/Local/Temp/22.htm
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