Which component is often a focal point of failure in high-voltage SF6 circuit breaker mechanisms?

In high-voltage SF6 circuit breaker mechanisms, the electrical contacts are critical components that are often a focal point of failure. This is because they are responsible for establishing and interrupting the electrical connection within the circuit. When the electrical contacts wear out, become corroded, or otherwise fail to operate correctly, it can lead to increased resistance, overheating, and ultimately, a failure in the circuit breaker’s operation. This makes the contacts essential for the reliability and efficiency of the breaker.

While the spring mechanism, control circuitry, and operating handle are also important components of the circuit breaker, they are less frequently the primary source of failure compared to the electrical contacts. The spring mechanism can fail due to mechanical fatigue, and the control circuitry could face issues from electrical anomalies, but the electrical contacts are directly involved in the energy transfer process, making them more susceptible to failure under high-stress conditions.