Technical FAQs

Ask a Question

How do the Micrologic trip units respond to harmonic loads?

Product Line:
Circuit Breaker Micrologic Trip Units

Environment:
Applies to the following Trip Units:
ET1.0I for P and R frames, 
2.0
3.0, 3.0A
5.0, 5.0A, 5.0P, 5.0H*
6.0A, 6.0P, 6.0H*

DOES NOT apply to ET1.0 for M frame

Resolution:

The Micrologic Trip Unit samples the current waveform to provide true RMS sensing and protection through the 15th harmonic.

* For the 5.0H and 6.0H Harmonic trip units measure FFT (fast fourier transform) of odd harmonics up to 31st harmonic (percentage of rms value with respect to rms value of the fundamental)
 
Was this helpful?
What can we do to improve the information ?