K
Dear All,
I am bit confused about the breaking capacity of a breaker. Recently I have seen Siemens soft starter catalogue in which the KA rating of a recommended breaker for a soft starter is 100KA but the soft starter itself is only 32KA. Now my doubt is that if there is a short circuit and the current is less than 100KA the breaker will not trip so since the current is more than 32KA the soft starter will not damage or my understanding about KA rating is wrong?
Other doubt is that in a network usually KA rating of an upstream breaker would be higher (say 50KA) than the downstream breaker (say 32KA). If we keep both 50KA then what would happen?
Please advice.
Thanks in advance.
KRA.
I am bit confused about the breaking capacity of a breaker. Recently I have seen Siemens soft starter catalogue in which the KA rating of a recommended breaker for a soft starter is 100KA but the soft starter itself is only 32KA. Now my doubt is that if there is a short circuit and the current is less than 100KA the breaker will not trip so since the current is more than 32KA the soft starter will not damage or my understanding about KA rating is wrong?
Other doubt is that in a network usually KA rating of an upstream breaker would be higher (say 50KA) than the downstream breaker (say 32KA). If we keep both 50KA then what would happen?
Please advice.
Thanks in advance.
KRA.