stackpole pushbutton switch encoder STACKPOLE This latest acquisition of the Eaton miniatures follows the previous purchases of switch lines from Stackpole, Shallcross, ASM and Centralab (crl). Electroswitch is "Brand Central" for these hard to find switches. Electroswitch announced a new design for the C4 Series (formerly stackpole). Although the C4 is an enclosed switch, many customers have asked for a completely sealed unit. Underwriters Laboratories International Demko (Denmark) has tested this new product to IP67. The intrusion protection (IP) rating, defined by the International Electrotechnical Commission in publication IEC 529, is a comparative rating indicating the extent to which equipment is protected against the ingress of dust and water. The rating consists of the "IP" prefix follow by two digits. The first digit, "6", indicates a dust tight rating and the second digit, "7", indicates protection against the effects of immersion in water to a depth of 1 meter for 30 minutes. Without doubt, a conformally coated stackpole C4 switch will reliably operate in harsh environments of dust and moisture.