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        External Environment For The Use Of Small DC Circuit Breakers

        Jun 08, 2023

        The impact of high altitude areas on product performance
        When the altitude is below 2000m, there is no significant impact on the performance of small DC circuit breakers.
        When the altitude is below 2000m, it is necessary to consider conditions such as air cooling and decreased dielectric properties. Therefore, manufacturers should negotiate working conditions with users or carry out special designs.
        The correction value made to the rated current when the segmented capacity remains unchanged above an altitude of 2000m.
        The impact of corrosive environments on metal components
        chlorine
        Nitrogen dioxide
        hydrogen sulfide
        sulfur dioxide
        copper
        The thickness of Copper monosulfide coating in chlorine environment will be twice that in normal environment.
        This is basically the same in the presence of nitrogen dioxide.
        silver
        When silver contacts or silver plated contacts are used in carbon dioxide and hydrogen sulfide environments, the contact surface will darken to form a Silver sulfide coating, which increases the contact temperature rise and can lead to contact damage. In a humid environment, when chlorine and hydrogen sulfide coexist, the thickness of the coating will expand by seven times. If hydrogen sulfide and nitrogen dioxide coexist, the thickness of the Silver sulfide coating will expand by 20 times.
        When selecting models, consideration should be given to
        In the refining, steel, papermaking, artificial fiber (nylon) industries, or factories that generally use sulfur, the equipment used is prone to sulfurization, also known as oxidation in the chemical industry.
        Installing equipment in the computer room does not guarantee that it will not be oxidized. In order to maintain a slightly higher air pressure inside the computer room than atmospheric pressure, the air inlet is generally shorter, which can indeed reduce external pollution to a certain extent. However, after 5 or 6 years of operation, equipment inevitably corrodes.
        Oxidation of equipment is inevitable. Therefore, in factory environments with corrosive gases, equipment needs to be derated for use, with a derating coefficient of 0.6 times the rated value of the equipment. This method can avoid accelerated oxidation due to temperature rise

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