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Voltage Limiting Device
Description

VLD must be used as a short-circuit device in order to limit the voltage between the return circuit and the structure earth, preventing dangerous touch voltages.

Our negative earth protection device fulfills all the criteria of the EN50122 standards. The protection scheme is proven as it is based on the same in-house components used in Sécheron DC Switchgears.

The VLD-B is designed for voltages below 1000 VDC, using a normally closed earthing switch with making capacity.

The VLD-H is specifically designed for networks up to 3600 VDC and is based on a hybrid switch consisting of anti-parallel thyristors and the earthing switch connected in parallel.

Principle diagrams
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Voltage Limiting Device
VLD
VLD