1) устройство защиты
2) разрядник; предохранитель
3) протектор
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- antenna lightning protector
- box Thread protector
- box protector
- casing protector
- corner protector
- drill-pipe protector
- lightning protector
- lip protector
- metal floor protector
- metal-oxide surge protector
- overheat protector
- pin thread protector
- pin protector
- spike protector
- surge protector
- thread protector
- vacuum lightning protector