Safety Extra Low Voltage A protected secondary circuit designed to work under normal operating conditions and single fault conditions, such that its voltages do not exceed a safe value Secondary output is limited to 60V max Power over LAN Hub output maximum is 52V The IEEE802 3af standard has set a maximum limit of 57V [Voltage Limits 42V to 57V]
Safety extra-low voltage A secondary circuit that under normal conditions has a voltage less than 42 4V peak or 42 VDC Under a single fault condition, this circuit should not exceed these values for longer than 0 2 second and should not exceed 71V peak or 120 VDC