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In Critical Facilities, the electrical load on the critical (UPS
output) bus is a continuous load that rarely changes (except to
increase!). A 100%-rated circuit breaker will carry 100%
of its rating continuously, but an 80%-rated circuit breaker will
carry only 80% of its rating. Why are 80%-rated circuit breakers
specified for continuous loads? By specifying 100%-rated
circuit breakers we can reduce first cost (CAPEX) and increase
availability.
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