IEC 62848-2:20 19适用于DC牵引系统中应用的电压限制装置（VLD），以符合根据IEC 62128系列防止DC和AC-DC组合电压电击的保护规定，同时考虑杂散电流规定。 VLD的工作方式是将DC铁路系统的轨道返回电路连接到接地系统或架空接触线区域或集电器区域内的导电部件。

IEC 62848-2:2019 applies to Voltage Limiting Devices (VLDs) to be applied in DC traction systems in order to comply with protective provisions against electric shock from DC, and combined AC – DC voltages, in accordance with the IEC 62128 series, taking into account stray current provisions.
VLDs operate in such a way as to connect the track return circuit of DC railway systems to the earthing system or to conductive parts within the overhead contact line zone or current collector zone.