I’m working on a fault current calculation for a meter stack and had a question regarding series ratings.
According to the manufacturer, the Siemens QPH breaker can be series-rated with a Siemens 3VA6-H breaker, resulting in a load center feeder breaker with a 100kA AIC rating. Additionally, a Siemens QP breaker can be series-rated with a QPH breaker at 22kA.
My question is: if the feeder breaker (QPH) is part of a series combination rated at 100kA with the upstream 3VA6, can the downstream branch breakers (QP) also be considered as having a 100kA series rating? Or are they still limited to their own tested series rating (22kA with QPH)?
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