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| Part Number | TH221A |
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| Manufacturer | ETC | |
| Short Description | Three-phase AC source phase sequence detection protector | |
| Long Description | 不需零线的三相交流源相序检测保护器集成电路 TH221A 作者：西安石油学院 李 宏 来源：《 |
Datasheet : TH221A |
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