Insulation monitoring device for unearthed ac, ac/dc and dc systems (it systems) up to 3(n)ac, ac 400 v, dc 400 v suitable for use in applications using generators according to din vde 0100-551 (48 pages)
Insulation monitoring device for it ac systems with galvanically connected rectifiers and inverters and for it dc systems specific to railway applications (62 pages)
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