What is the function of a Bellville washer in electrical connections?

The function of a Bellville washer in electrical connections primarily revolves around its ability to maintain a high clamping force. This design is particularly beneficial in ensuring consistent contact pressure, which is essential for maximizing the contact area between the connected surfaces. By providing this uniform pressure, Bellville washers help reduce the risk of connection loosening due to vibrations or thermal expansion and contraction over time.

When a Bellville washer is placed under a bolt head or nut, its unique shape allows it to exert a strong force even when there are fluctuations in external factors, such as temperature changes. This constant pressure helps ensure a reliable electrical connection, minimizing the possibility of increased resistance or failures that could arise from loose or poorly connected terminals.

Other options, such as reducing electrical resistance or acting as a cooling agent, do not align with the specific mechanical properties and primary usage of a Bellville washer in electrical systems, while increasing flexibility is not a typical function of this type of washer.