The KSK-1A85 series reed switch is a vacuum high power and high voltage switch with glass length of 21.0mm and diameter of 2.75mm. Rated power 100 W, Switching voltage 1,000 VDC, Switching current 1 Amp DC. Most used, UL approval.
Automotive, test and measurement (ATE), high power, high voltage
Data Sheet Link https://standexelectronics.com/viewer/pdfjs/web/viewer.php?file=https%3A%2F%2Fstandexelectronics.com%2Fwp-content%2Fuploads%2F2019%2F03%2FKSK-1A85_V03.pdf