In oil circuit breakers, where is the interrupting mechanism located?

The interrupting mechanism in oil circuit breakers is submerged in oil. This design is crucial because the oil serves as both an insulator and a coolant, allowing the mechanism to operate effectively while maintaining high voltage isolation. When the circuit breaker operates to interrupt the current, the oil helps to quench the arc that may form, ensuring reliable operation and safety. Being submerged also protects the mechanism from environmental factors that could affect its performance. This arrangement allows for both efficient heat dissipation and reliable interruption capabilities.