The pole number is another important factor in circuit breaker selection, and the term "pole" is also referred to as 1P. In household single-phase circuits, circuit breakers come in different types such as 1P, 1P+N, and 2P. A 1P circuit breaker only disconnects the live wire and continuously monitors the current flowing through it. If the current reaches the rated value, the circuit breaker will trip to protect the live wire.
A 1P+N circuit breaker allows both the live and neutral wires to be disconnected, but it only detects the current on the live wire, providing protection for that line. On the other hand, a 2P circuit breaker can disconnect both the live and neutral wires while simultaneously monitoring the current on both lines, offering more comprehensive protection.
For general lighting circuits, you can choose either a 1P or 1P+N circuit breaker. However, for socket circuits, especially those requiring leakage protection, it's essential to use a suitable type. For example, a five-hole socket typically uses a 1P or 1P+N leakage circuit breaker, while a three-hole socket requires a 2P leakage circuit breaker to ensure safety and proper functionality. Understanding these differences helps in selecting the right circuit breaker for various applications, ensuring both efficiency and electrical safety.
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