1.Appliction: For protecting cables and equipments against overload and short circuit.
2.General rules for choosing MCB.
a.Technical data of the network at the point considered:
The earthing systems, short-circuit current at the circuit at the circuit breaker installation point. Which must always be less than the breaking capacity of this device , network normal voltage.
b.There are 3 curye characte ristics for magnetic operation:
B curve (3-5 In)protection and control of the circuits against length cables in TN and IT systems.
C curve (5-10 In)protection and control of the circuits against overloads and short -circuits; protection for resustive and inductive Ioads with low inrush current.
D curve(10-14In)protection and control of the circuits against overloads and short -circuits; Protection for circuits which supply loads with high in rush current at the circuit closing (LV/LV transformers, breakdown lamps).
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