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whats the diff b/w mpcb and mcb?weather it trips on single
phasing or not.
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Answer Posted / sayan
MPCB:Motor Protection Circuit Breaker, which performs the
same function as that of an SFU.
MCB:Miniature Circuit Breaker, It also functions as a short
circuit prevention device. It can be 1,2,3,4 poles
depending on the requirement.
| Is This Answer Correct ? | 12 Yes | 5 No |
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My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
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