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I'm trying to understand the need for a dry contact switch or a hermetically sealed swtich. Most literature that I've read points to a recommendation to use hermetically sealed switches for corrosion resistance.
I'm trying to understand the recommendation in today's applications for hermetically sealed switches. If a dry contact switch is purchased and is to be installed inside of a aluminum housing assembly which is IP 66 (Nema 4X) and explosion proof, I can't see the full need for specifying hermetically sealed switches.
However vendors still offer options to purchase a hermetically sealed switch that will be located inside of an IP 66 explosion proof enclosure and still recommend hermetic switches for specific applications.
I haven't been able to find specific literature to differentiate the need, however, I think that a hermetically sealed switch would be beneficial when the switches are not located inside of an enclosure which offers hazardous area certification and ingress protection.
Is it such that even if installed in these enclosures humidity or corrosion could still form inside of the enclosure?
Thanks in advance for any information.
I'm trying to understand the recommendation in today's applications for hermetically sealed switches. If a dry contact switch is purchased and is to be installed inside of a aluminum housing assembly which is IP 66 (Nema 4X) and explosion proof, I can't see the full need for specifying hermetically sealed switches.
However vendors still offer options to purchase a hermetically sealed switch that will be located inside of an IP 66 explosion proof enclosure and still recommend hermetic switches for specific applications.
I haven't been able to find specific literature to differentiate the need, however, I think that a hermetically sealed switch would be beneficial when the switches are not located inside of an enclosure which offers hazardous area certification and ingress protection.
Is it such that even if installed in these enclosures humidity or corrosion could still form inside of the enclosure?
Thanks in advance for any information.