The different types of sealed switch options for harsh environments are Splash proof boots and IP-Rated switches. Splash proof boots are excellent for many designs even though they do not offer a complete seal. Splash proof boots are ideal for medical and industrial control environments because constant exposure to contaminants isn’t likely but semi-frequent routine exposure is expected. Splash proof boots come in a variety of materials making it very important to choose the right one for the design environment being used. They are Silicone Rubber, Natural Rubber, Polyvinyl Chloride, Nitrile Butadiene Rubber, and Ethylene Propylene Rubber. IP-Rated switches are the best choice for automotive, transportation, and heavy equipment applications. IP-Rated switches are process sealed during manufacturing and are guaranteed to resist certain environmental factors based on a ratings classification system established by the ISO IEC60529 standard. This directive specifies the degree of protection of enclosures for low-voltage switches, specifically protecting operators from contact with live or moving parts and preventing contamination. Common ratings are listed in the chart above with their meanings. The best way to combat premature switch failure in harsh environments is to use an IP-Rated device with a splash proof boot. If an application requiring an IP-Rated switch impacts the safety of either the equipment or human life, designing in both is important to ensure the highest level of safety and avoid contamination.