Title :
Circuit-breaker ratings: weighing high interrupting capacity and short-time current ratings
Author :
Roybal, David D.
Author_Institution :
Eaton Electr., Livenmore, MA, USA
Abstract :
This article discusses the interrupting-capacity (IC) rating and short-time current ratings of molded-case circuit breakers (MCCB), insulated-case circuit breakers (ICCBs), and low-voltage power circuit breakers (LVPCBs) and their effect on time-current coordination. Resistive and reactive X/R ratios are reviewed and the short-time current and instantaneous trip characteristics of microprocessor-based trip units are explained in this paper.
Keywords :
circuit breakers; short-circuit currents; ICCB; LVPCB; MCCB; instantaneous trip characteristics; insulated-case circuit breaker; interrupting-capacity rating; low-voltage power circuit breaker; microprocessor-based trip unit; molded-case circuit breaker; short-time current rating; time-current coordination; ANSI standards; Application specific integrated circuits; Circuit breakers; Delay effects; Fault currents; Magnetic devices; Manufacturing; Power systems; Protection; Voltage;
Journal_Title :
Industry Applications Magazine, IEEE
DOI :
10.1109/MIA.2005.1458278
