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Posted: 2025-08-27 05:54 AM
We are currently facing difficulties in achieving full selectivity between the circuit breakers in our Ecodial studies. In several cases, the software indicates “Selectivity Limit” or “No Selectivity.”
In this regard:
What are the recommended measures or settings that can be applied in order to achieve full selectivity between the upstream and downstream breakers?
Do the cable sizes and lengths play a significant role in the selectivity coordination, and to what extent should these parameters be considered when attempting to improve selectivity results?
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Posted: 2025-08-28 10:27 PM
1. The selectivity tables provided by Schneider Electric gives some tipss on the expected selectivity results. It's useful to look at it in order to choose the right circuit breakers upstream or downstream according to the selectivity result that you want.
2. Yes, sometimes the selectivity results depends on the short-circuits level which are linked to cable sizes and lengths in some extent.
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Posted: 2025-08-28 10:27 PM
1. The selectivity tables provided by Schneider Electric gives some tipss on the expected selectivity results. It's useful to look at it in order to choose the right circuit breakers upstream or downstream according to the selectivity result that you want.
2. Yes, sometimes the selectivity results depends on the short-circuits level which are linked to cable sizes and lengths in some extent.
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Posted: 2025-10-29 10:35 PM . Last Modified: 2025-10-29 11:32 PM
hello @Ahmad3
thanks for the query,
to ensure total selectivity, you have multiples options,
a. if you use the automatic solution provided by the application instead of manually selecting the breaker, the chances of having total selectivity are higher
b. another great option is to use the ECT tool:
ect.se.com
and under there, you can select- search selectivity, you can select your upstream breaker and get a list of breakers which will give you total selectivity :
you can search for upstream and downstream breakers alike.
2. you second query was regarding cable parameters affecting the selectivity studies:
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