Determine minimum load required to show data on Micrologic Trip Unit displays
Micrologic A, P and H Trip Units used in Powerpact P, R, and Masterpact NT and NW Breakers
The trip units 3.0A, 5.0A, 6.0A, 5.0P, 6.0P, 5.0H and 6.0H require a minimum of 20% load going through the breaker to internally power the display and show data.
However, the back light will not be illuminated.
When externally powering the trip unit with 24Vdc on terminals F1 (neg.) and F2 (pos.) the display will also show data below 20% load, and the back light will be illuminated.
for other benefits of using a 24Vdc power supply.