MCCB - Short time Setting - TCC - Clarification

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Charz

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Location
Texas
The attached is the TCC curve for a short time funtion of the trip unit does not show, at which of the current value it trips, though commit time and clear times are provided


In the attached TCC, just for set band values, the trip times are mentioned. How can I find the appropriate current value?
 

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ATSman

ATSman

ATSman
Location
San Francisco Bay Area
Occupation
Electrical Engineer/ Electrical Testing & Controls
The values of current are in multiples of LTPU, or trip unit sensor rating.
I.E. for an 800A rated trip unit, if the STD setting is set on band 2 and the breaker is drawing 1600A (2X) then the trip time would be from 1.5 to 2.4 sec.
 
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