E-Book: Guide to Circuit Breakers for Equipment

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Contents of this Issue


Page 1 of 29

Contents Introduction 4 Why Circuit Breakers for Equipment? 4 What is a Circuit Breaker for Equipment (CBE)? 5 The Consequences of Failure 6 Types of CBEs 6 Thermal CBE Thermal-Magnetic CBEs Hydraulic-Magnetic CBEs Magnetic CBEs Electronic Hybrid CBEs High Performance CBEs IEC CBE Classifi cations 9 CBE Terminology Explained 9 Time/current tripping characteristics Ambient temperature - derating factors Rated voltage Interrupting capacity PC1 PC2 Trip-free Environmental performance Additional Features of CBEs 12 Auxiliary contacts Dual control (remote trip) Double/multi pole protection Manual operation Shunt terminal Undervoltage release Visual indicator Selection of a CBE 13

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