CRITERIA ON THE SELECTION OF LOW VOLTAGE CIRCUIT BREAKERS
Basic Circuit Breaker Selection Criteria
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Low Voltage Circuit Breakers |
The selection of any circuit breaker, for any given duty, is
ultimately based on an assessment of its ability to perform the following basic
functions:
a) To carry the required full-load current without
overheating (i.e., it should have the correct current rating)
b) To switch and isolate or disconnect the load from the
source at the given system voltage (i.e., it should have the correct voltage
rating),
c) To interrupt any possible abnormally high operating
current or short-circuit current likely to be encountered during operation
(i.e., it should have the correct interrupting rating)
d) To be able to perform these functions over an acceptably
long period of time under the operating and environmental conditions that will
actually prevail in the application (i.e., it should have the correct mounting
provisions, enclosure, and accessories for operation in the environment in
which it is to be applied).
The degree to which a circuit breaker can satisfy these
requirements is a measure of its applicability
for a function. A circuit breaker's rating indicates these
capabilities to the user because rating is established by proof testing.
Hence, an understanding of how a circuit breaker of any
given type is tested will give insight to its applicability for any function.
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