1P, 2P, and 1P+N circuit breakers are types of circuit protection devices used in electrical systems to prevent overcurrent and protect against electrical faults. Each of these breakers has specific applications and characteristics:


1P Circuit Breaker (Single-Pole):

A 1P circuit breaker is designed to provide protection for a single conductor or one phase of an electrical circuit.
It is commonly used for protecting lighting circuits or small appliances.
It can interrupt the flow of current in only one conductor.

2P Circuit Breaker (Double-Pole):

A 2P circuit breaker is designed to provide protection for two conductors or both phases of a single-phase circuit.
It is commonly used for general-purpose circuits, such as those supplying power outlets.
It can interrupt the flow of current in both conductors simultaneously.

1P+N Circuit Breaker (Single-Pole with Neutral):

A 1P+N circuit breaker combines a single-pole circuit breaker with a neutral conductor connection.
It is used for circuits where the load requires protection but also requires a neutral connection, such as in some single-phase applications.
It can interrupt the flow of current in a single conductor (usually the phase) while allowing the neutral to remain connected.
The choice of which type of circuit breaker to use depends on the specific requirements of the electrical circuit and the intended application. For example, in residential wiring, you may use 1P circuit breakers for lighting and 2P circuit breakers for power outlets, while 1P+N circuit breakers may be used for specific appliances that require a neutral connection.

It’s important to select the appropriate circuit breaker size (current rating) for the circuit to ensure proper protection against overloads and short circuits. Additionally, for three-phase systems, different types of circuit breakers, such as 3P and 3P+N, are used to protect each phase and the neutral conductor.

Always consult local electrical codes and regulations and seek the advice of a qualified electrician when working with electrical circuits to ensure safety and compliance.