施耐德中国总代理现货RM4TA32
简介：
选择热保护
为了延长电机寿命，选择合适的热保护非常重要，这样可以防止电机运行时异常发热，同时确保在机器或厂房设备运转时有最
大的连续性，避免任何不必要的停机。
了解实际运行条件是非常重要的：
- 环境温度，
- 运行温度，
- 标准工作类别，
以决定电机的运行值( 功率、电流)，同时能选择有效的热保护。
这些运行值由电机制造商给出。
不同类型的电机保护设备是有所差异的：
- 热过载继电器或热磁电动机断路器，
- 热敏电阻或保护继电器，
- 电子式多功能型保护继电器。
热过载继电器保护
常用的热过载继电器可以在两方面保护电机：
● 通过监测每相电流保护过载，
● 通过差动装置保护缺相。
热过载继电器约占电机故障的44%，因此热过载继电器得到了广泛应用，非常可靠而且使用成本相对较低。
然而，热过载继电器也有不足之处，它对电动机的发热状态未能给出精确的反映。
实际上，热过载继电器的工作原理是基于通过电机的电流产生热量，会引起双金属片的弯曲。由于电机和热过载继电器的发热
惯性是不同的，在某些情况下，即使在电机温度仍然很高的情况下，热过载继电器也可能在过载脱扣情况下重新起动电机。
PTC 热电耦继电器保护
通过嵌入在电动机绕组内的PTC 热敏电阻探头和热敏电阻保护继电器 (LT3-S)，可以更好地监测电机内部温度。
如下型号的热继电器及相应辅助触点均有大量库存！施耐德中国区一级代理，原装正品！质量，客户服务第一！
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