What does the number of poles of a miniature circuit breaker mean? What does N stand for?

Generally, whether it is a small circuit breaker, a molded case circuit breaker, an air circuit breaker, and other different types of equipment, the number of their poles is generally represented by the letter P, and if it is a single-pole form, it will use 1P in the model or parameter Said, and so on 2P, 3P, 4P and so on.

What does the number of poles of a miniature circuit breaker mean? To say that the white point refers to the number of wires to cut off the circuit, if the circuit breaker is 1 pole (1P), it means that one wire can be cut off. If the circuit breaker is 2 poles (2P), two wires can be cut at the same time. The number of poles refers to the number of broken wires. Miniature circuit breakers with 1 pole and 2 poles are used for single-phase circuits, and 3 poles and 4 poles are used for three-phase circuits.

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The quantity of the phase line pole and zero line that the miniature circuit breaker can be connected to and disconnected is as follows:

◆1 pole (1P): Only one phase can be connected and disconnected.

◆2 poles (2P): It can connect and disconnect one phase line and one neutral line. Whether the neutral line is disconnected or connected together with the phase line depends on the actual application requirements.

◆3 poles (3P): can connect and disconnect three-phase lines.

◆4 poles (4P): can connect and disconnect three-phase line and one zero line.

What does N in the number of poles of a miniature circuit breaker stand for? The N here means "zero line" terminal. Generally, if the number of poles is 1P+N or 3P+N, it means that the miniature circuit breaker has N wiring, because these switches will only disconnect when they are in action. Open the fire wire without disconnecting the neutral wire.

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The 1P+N miniature circuit breaker adopts a single-pole two-wire form, that is to say, it has a single-chip air switch and a leakage protection accessory combined. The live wire and the neutral wire enter and exit the combined switch together. When the protected circuit has a leakage fault Its leakage protection accessory will drive the miniature circuit breaker to trip together. At this time, only the live wire is disconnected from the external network, but the neutral wire will not be disconnected.

The 2P miniature circuit breaker adopts two-pole two-wire form, with a two-piece air switch and a combination of leakage protection accessories. When a leakage fault occurs, the leakage protection accessory will also drive the air switch to trip together. At this time, the live wire, neutral wire, and external network power will all be disconnected, so that the line protection measures will be more safe and reliable.

What does the number of poles of the miniature circuit breaker mean? What does N stand for? , I hope to help everyone. You can log in to the okplazas.com motor store to view the product information of circuit breakers. Welcome to e-mail: [email protected] for consultation, and you can also contact WeChat customer service +86-13689242098 online for product consultation!