What typically causes weak circuit breakers?

Weak circuit breakers are often a result of overheating and poor connections. When a circuit breaker experiences overheating, it can disrupt its ability to function correctly. This excessive heat can arise from continuous overloading, where the breaker is frequently exposed to more electrical load than it is designed to handle. Additionally, poor connections within the circuit can lead to increased resistance, which further contributes to heat buildup. This combination can lead to the breaker tripping more frequently, not providing reliable service, or even failing to trip during an overload situation, thus making the circuit 'weak'.

Other factors like high humidity, excessive circuit length, or low voltage conditions do not directly lead to weak circuit breakers. While humidity can cause corrosion and may affect electrical components, it is not a primary cause of a circuit breaker’s weakness. Excessive circuit length could introduce voltage drop issues, but it doesn’t inherently weaken the breaker itself. Low voltage conditions might not directly affect the function of a circuit breaker but can lead to inadequate performance of devices connected to the circuit.