PREDICTING MOLDED-CASE CIRCUIT-BREAKER LET-THROUGH CHARACTERISTICS INAN ELECTRICAL SYSTEM UNDER SHORT-CIRCUIT CONDITIONS

Calculation techniques used in designing low-voltage electrical distri bution systems have advanced decidedly over the past two decades, as h as the design of modern molded-case circuit breakers (MCCB's). There i s a need for data and interfacing techniques that permit the system de sign engineer to calculate system response under short-circuit conditi ons with the MCCB as an active element of the circuit. This paper disc ussed the MCCB as a circuit element and describes one method of calcul ating system behavior with the MCCB as an element.