50kV 4kN Railway Polymer Insulator

The nominal voltage of the overhead contact system for domestic electrified railway trunk lines is 25kV; 50kV is mostly used in overseas railways, subway DC, substations, and double-insulated/high-altitude reinforced types; 4kN is the rated bending failure load, which is generally used for post/crossarm type insulators and non-overhead contact system cantilever arms (cantilever arms commonly use 12-20kN).

Application:

Railway Application Scenarios

Overseas electrified railway substations and disconnector switch support;
DC metro/light rail 50kV equipment support;
25kV overhead contact line high-altitude/double insulation reinforced solution, equipment side support (cannot be directly used as a cantilever arm due to insufficient mechanical strength; minimum cantilever arm requirement is 12kN).

Important: Domestic TB/T3199 standard requires overhead contact line cantilever arm insulators to withstand bending failure ≥12kN; 4kN insulators can only be used as equipment supports, not for overhead contact line cantilever arm stress.

 

The End Fittings--U Clevis / U Bolt

 

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