The grounding connection in urban trains and metros provides a low-resistance path for the return of electrical current from stationary to rotating parts.
The main functions of the grounding connection include:
- Transmission of active current (traction motor current, APS system, etc.)
- Transmission of signal current (signaling system)
- Protective grounding
In the grounding system of urban trains or metros, the Insulation part for the brush holder is a component manufactured by Schunk (Germany) with part number 51.66.0407.00. Made from special polyamide and fiber combinations, this component is responsible for insulating and holding the brushes.
In the production of this component, the choice of material and dimensional tolerances for plastic injection is critical to ensuring minimal electrical resistance.
