| 断路器的选择 |
| 添加时间：2018/10/23 13:45:44 浏览次数： |
| 1.在照明回路中为了减少工程造价，通常选用1P断路器，需要注意的是上级断路器必须具备漏电脱扣功能，，必须切断上级电源； 1. In order to reduce the project cost in the lighting circuit, the 1P circuit breaker is usually selected. It should be noted that the upper circuit breaker must have the function of leakage and release, and the upper power supply must be cut off. 2.断电检修时为了预防火线与零线接反酿成事故（当火线与零线接反时1P断开了零线而没有断开火线），可用采用1P+N短路器，即常说的DPN断路器。 2. In order to prevent the accident caused by the connection between the fire line and the zero line (when the fire line is connected with the zero line, 1P disconnects the zero line but does not disconnect the fire line), the 1P+N short circuit breaker, or DPN circuit breaker, can be used. 3.对于相同尺寸的断路器外壳壳体来说，1P和装1P+N是有区别的，前者在短路事故状态下的极限分断能力高于后者。所以对于工程中比较重要的回路和频繁检修与操作的回路建议使用2P断路器，但是成本较高。 3. For the same size of circuit breaker shell, 1P and 1P+N are different. The limit breaking ability of the former is higher than that of the latter under short-circuit accident. Therefore, it is recommended to use 2P circuit breaker for the more important circuit and the circuit with frequent maintenance and operation, but the cost is higher. 另外：1P、2P用于单相，3P、4P用于三相。 In addition, 1P and 2P are used for single-phase, 3P and 4P for three-phase. 当是保护接零时，只能用1P、3P；当是保护接地时，最好用2P、4P。 When protection is zero, 1P and 3P can only be used. When it is protective grounding, it is best to use 2P and 4P. 1P+N：只在相线上装设保护器，动作时同时断开相线。 1P+N: only a protector is installed on the phase line, while the phase line is broken simultaneously. |
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