Radwell DE
PREVENTS ONESWITCH FROM CLOSING TO ON-POSITION, IFTHE OTHER IS NOT IN OFF-POSITION. WHEN MOUNTED UPSIDE DOWN, PREVENTS ONE SWITCH FROM OPENING TO OFF-POSITION, IF THE OTHER IS NOT IN ON-POSITION. (UPS-USAGE, MAKE-BEFORE-BREAK)
PREVENTS ONESWITCH FROM CLOSING TO ON-POSITION, IFTHE OTHER IS NOT IN OFF-POSITION. WHEN MOUNTED UPSIDE DOWN, PREVENTS ONE SWITCH FROM OPENING TO OFF-POSITION, IF THE OTHER IS NOT IN ON-POSITION. (UPS-USAGE, MAKE-BEFORE-BREAK)