Question

A 3KW 230V immersion-heater power circuit may be protected by a fuse rated at? ​

Answer 1

Answer:

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Step-by-step explanation:

P=1.25 kW

V=220 V

P=VI

1250=220 X I

I=5.7A

Fuse is used for protection against short circuit. Fuse rating is approximately 2.5 times the rated current.

Therefor fuse rating is 2.5 X 5.7 A=14.25 A. Therefor fuse rating is 1 5A.

Answer 2

P = 3KW

V = 230V

P = VI

I = P/V

I = 3000/230

I = 13.04 (Approx)

So a 15A fuse should be used.

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