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What are tha parameters that governs the breaker sizing in HT and LT. What are the rules for selecting the breaker for both Ht and LT? what are the different types of breaker? please help.. thanks in advanvce..
There are many types of circuit breakers(oil,air,SF6,vacuum etc) but all of them do the same functions namely making or breaking a circuit.
Generally speaking big CBs are classified as Type A or B and capabliities(Ir,Im,Icw,Ics,Icu etc)
MCCBs as general use current limiting,motor type etc
MCBs are classified as type B,C,D etc due to tripping characteristics of load(resistive,inductive,motor,fluctuating,welding etc)
Refer http://www.electrical-installation.org/lv switchgear functions and selection
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