Dimensioning thermal circuit breakers for equipment

Factors that need to be considered when selecting rated currents of circuit breakers

Thermal circuit breakers for equipment (CBE) protect motors and transformers against electrical overloading. The trip release of a breaker takes place with the deflection of a bimetal. This deflection is in turn dependent on heat caused by the level of current flowing through the bimetal. The typical time-current characteristic of a thermal circuit breaker is a result of the thermal delay of the bimetal.

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Data sheet (233 KB)