Monitoring relays from Carlo Gavazzi can also be used as 1-phase or 3- phase over current monitoring relays when connected with MI or MP current transformers.Owing to the built-in latch function, the ON-position of the relay output can be maintained. The red LED indicates the alarm status. · · · AC/DC over voltage monitoring relay · · Selection of measuring range by DIP-switches · · Measuring ranges: 2 to 20 VAC/DC, 5 to 50 VAC/DC, · · Adjustable voltage limit on relative scale · · 2.5mm · · A-series