The art of discrimination

Article Abstract:

Circuit-protective devices used fault energy to determine discrimination. Fuse elements can melt instantly when a fault occurs and the current will never reach its theoretical peak value, which limits fault energy and damage to the circuit. In a moulded case circuit-breaker (MCCB), the tripping unit controls the timing of the trip bar, consisting of a bi-metal strip, which should match the heat response of the circuit being protected, providing a degree of overload protection. A solid-state control unit is used in an electronic breaker, resulting in increased accuracy, improved control and management and a broader range of settings.

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A clear case of discrimination

Article Abstract:

Descrimination calculations for circuit protection are traditionally thought of as being straight-forward to calculate, which means that fuses are more often selected for circuit protection than circuit breakers. Fuses have to be disposed of because they rupture when their failsafe mechanism comes into operation. Circuit breakers can be reset, however, although their reliability is regarded to be uncertain. Modern techniques are now available to accurately calculate the descrimination measurements, so circuit breakers can be used more reliably.

Methods

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Fuse confusion

Article Abstract:

Fuses are safe and reliable but circuit breakers can also be used to increase safety. They are commonly used in starting motors or where circuits and transformers are used. There are many designs of circuit breakers available and it is possible that inexperienced users will not understand how they perform in a short circuit. Fuses operate with extra safety levels during a major short circuit but breakers present problems as fault levels get larger.

Switchgear and Switchboard Apparatus Manufacturing, Switchgear and switchboard apparatus, Electrical Fuses & Fuse Equip, Power Circuit Breakers

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