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Why the rating of the HT breakers are in 1250 Amp, while
the load on the breaker is around 50 Amp. ?
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Answer Posted / arjun
it is coz the voltage at the HT side is much high & so is the pressure of the voltage is also much high, therefor the selection of the HT breaker depends on various other factors such as pole distance(distance between the poles of the breaker ) ,voltage (The voltage rating of the circuit breaker must be at least equal to the circuit voltage.), ambient temperature,overload,continuous current rating & max current it can handle before tripping .so even if the current though a HT circuit is low we need a breaker of much higher ratting
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