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doubt surge protector and Varistor

doubt surge protector and Varistor

doubt surge protector and Varistor

(OP)
I have a surge protector 220v, it uses 3 x 20mm varistors When a varistor bursts or explodes or at the end of its useful life, the protection is lost but the surge protector sockets continue to operate without protection? 3 varistors F-N, F-T, N-T

RE: doubt surge protector and Varistor

Sometimes they fail short-circuit, causing other components such as circuit breakers to trip, or setting fire from overheating.

RE: doubt surge protector and Varistor

1. In your case, the sockets are working fine. It could be that one of the varistors failed. It is in open-circuit condition. Note: very often it (short-circuit) when failed. But , not in your case. Just cut it off and remove it. place it ASAP.
2. As regarding whether the protection is lost, it depends on which varistor that failed. There are three F-N, F-T, N-T.
a) if F-N failed, only the N is not protected against high voltage surge,
b) if F-T failed, only the T is not protected against high voltage surge,
c) if N-T failed, only the N-T is not protected against high voltage surge.
Note: Each function/protection individually, independently.
3. No urgency when any of one of them failed (to open circuit), remove only the faulty one and replace it ASAP.
Che Kuan Yau (Singapore)

RE: doubt surge protector and Varistor

(OP)
Have I ever replaced the fuse on this surge protector

RE: doubt surge protector and Varistor


arrety87 (Chemical)(OP)16 Oct 23 19:42
" Have I ever replaced the fuse on this surge protector"

1. Do you mean " Do I have to replace the fuse on this surge protector ? "
2. No. In this case, it was reported that it is working fine but one of the varistor failed. The faulty varistor is in open circuit condition, NOT shorted. If any of the varistors is Shorted, the fuse would be blown, the surge protector would be out of service.
3. BTW if any varistor is faulty (open circuit), there is no urgency; cut it off and replace it ASAP.
Che Kuan Yau (Singapore)

RE: doubt surge protector and Varistor

(OP)
I don't know if a varistor failed, I just said I never needed to change the fuse

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