What does the symbol for a pressure switch that opens on a rise in pressure look like?

The symbol for a pressure switch that opens on a rise in pressure is represented by a circle with a dashed line. This representation illustrates the function of the switch, indicating that the circuit opens when the pressure exceeds a certain level.

In electrical schematics, symbols are designed to quickly convey the function of components. The dashed line signifies a non-continuous or intermittent connection, which aligns with the operational nature of a pressure switch that responds to changes in pressure. Specifically, it highlights that the switch closes under normal conditions and opens when the pressure rises beyond its designed threshold.

Understanding these symbols is crucial for interpreting wiring diagrams and schematics accurately, ensuring that technicians can effectively troubleshoot and install pressure-sensitive devices in various applications.