Release Settings for Low Voltage Circuit Breakers

This post describes the guidelines for providing pickup settings for various feeders in Low voltage switchgear.

LV RELEASE SETTING (low voltage):
LV setting for downstream, such as end equipment like motor and capacitor banks, the release has to trip instantaneously at a minimum time delay. But for the lumped loads relay or release and cables are not required. The following equation is used to evaluate the release setting in the distribution system.

Release setting for Transformer LV side, there is no need for instantaneous tripping, but the tripping characteristic curve should not intersect with the tripping characteristic curve of other equipment. There are two methods to evaluate the release setting of the Transformer LV side. Method 1: If the number of loads or motors is known and there is no future addition of loads

Method 2: If the loads are not known and in case of addition of future loads,

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