Definitions for "SELV"
Keywords:  vdc, vac, voltage, safety, extra
Separated extra low voltage- This should be safely separated from other circuits that carry higher voltages and isolated from earth (ground) and from the protective earth conductors of other circuits.
Safety Extra Low Voltage, operating at 50v or less
An abbreviation for Safety Extra Low Voltage, a term generally defined by the regulatory agencies as the highest voltage that can be contacted by a person and not cause injury. It is often specifically defined as 30 VAC or 42.4 VDC.