The KSK-1A52 series reed switch is a high breakdown voltage reed switch with glass length of 21.0mm and diameter of 2.75mm. Rated power 50 W, Switching voltage 350 VDC, Switching current 0.5 Amp DC.
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-1A52_V03.pdf