Technical FAQs

Ask a Question

What is the minimum level of current displayed by Micrologic trip units on Powerpact M, P, and Masterpact breakers

Issue:
Inaccurate reading on the LCD Display of the Ammeter trip unit

Product Line:
Circuit breaker

Resolution:
With current flow between 0 and 20% of sensor value, the ammeter may not be accurate. 
Even with external power supplied, current through the circuit breaker must exceed 0.20 x In for the ammeter reading to be accurate to within 1.5%. 

> Below 0.1 x In, measurements are not significant
> Between 0.1 x In and 0.2 x In, accuracy changes linearly from 4 % to 1.5 %
> Between 0.2 x In and 1.2 x In, accuracy = 1.5 % 
Was this helpful?
What can we do to improve the information ?