If your doctor prescribed a particular brand of contacts, it's best to stick with a retailer that offers that brand.

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A constricted arc that remains on one spot for too long can thermally overstress the contacts to such a degree that the deionization of the contact zone at current zero can no longer be guaranteed. To ...

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2 hours and 45 minutes, including one intermission. Recommended for ages 12 and up. Children under the age of 4 are not permitted. This production uses strobe lights, gunfire, herbal cigarette ...

but it does not give any indication of the condition of the arcing contacts. One option is to do an internal inspection but it is time-consuming. In the case of SF6 breakers, maintenance procedures ...