ZHCSQT7E October 2001 – July 2022 DCR010503 , DCR010505 , DCR011203 , DCR011205 , DCR012403 , DCR012405
PRODUCTION DATA
Underwriters Laboratories, UL? defines several classes of isolation that are used in modern power supplies.
Safety extra low voltage (SELV) is defined by UL (UL1950 E199929) as a secondary circuit, which is so designated and protected so that under normal and single fault conditions, the voltage between any two accessible parts or between an accessible part and the equipment earthing terminal for operational isolation does not exceed steady state 42.5-VRMS or 60-VDC peak for more than one second.