The 'Active' tag relates to the prevention of any 're-activation' of the power-supply after any inadvertent form of power outage, as soon as the mains supply becomes re-established; the 'Latch' tag relates to a 'switch' inside the 'RCD-unit' that remains as set following any form of 'regular' power-outage, but has to be reset manually after the detection of an error-condition.