1 | P a g e

2 | P a g e

:

:

3 | P a g e

4 | P a g e

:

5:

7 :3-1

13 :3-2

1 5 :3-3

1 6 :3-4

1 8 :3-5

21 :3-6

2 5 :3-7

2 5 :3-8

33 MCB :3-9

MCB 38 :11 -3

38 MCB :3-11

MCB 39 :3-12

5 | P a g e

:

. . . . .

.

.

.

.

.

.

6 | P a g e

.

.

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: :3-1

: (-1) single pole switch -1 (-1) Two pole switch -2 (-1) flash mounted)two way switch) -3

7 | P a g e

(-1) Inter mediate switch -4

: . .

. 3-2

.

8 | P a g e

) (: 3-3

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.

.

.

9 | P a g e

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off on n.

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18 | P a g e

3pole (ph+N+E) 230V/16 A SU.M

3pole (ph+N+E) 230V/16A water proof

(3ph+N) 400V/25A 4pole

:

. -1 . (earth)-2 .-3 . -4

3ph+E+N 3ph+N

3ph

5-outdoor indoor .

.-3 :: 5-3

.

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19 | P a g e

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Quick acting/fast acting )(-1 slow blow/time delay -2 Doul element--3 Current limiting fase very fast acting fare -4

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22 | P a g e

:-

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23 | P a g e

C B ( BC. ) C

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24 | P a g e

:

IEC

IEEE/ANSI

: Time current curve Tcc -

.

25 | P a g e

: : 3-7

. 1999 2 .

15 20 25 35 50 6316

10 6 4 2

400 350 300 260 225 200 160 125 100 80

1000 800 630 500 430

.

(:fuze sizing) : 3-8

:

-1

-2

:

) (75 -1

(K1). 25

K .A b.temp) 2) -2

26 | P a g e

:

25 . 39

75

Example ) 4

4 100

220 = 1.8 A

27 | P a g e

K1K2 I fuze

1.8

0.75= 2.4

A 4 .

1.8

0.75 0.85= 2.82

A 4

.

2 2.5 "

) ( .

indoor outdoor indoor 25 .

28 | P a g e

:

In

. .

1.75 1.3:

1) 1.75

2) 3

: .

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:

29 | P a g e

( 2 ) ) (

1.75 = A

3 = YA

starting

.

Example ) 33/9 39 339 . . 9 /09

.

:

power shaft

.

.

= PE, In=

PE

3 cos

31 | P a g e

3 cos =

30000

0.9 380 0.86 3 = 58.89 A

I = 1.75 58.89 = 103.06 A

. A 199

= 6 58.89 = 353.34

: 3-13.

.

. .

4

1 > 2 > 3

31 | P a g e

start I .

= 3 + 2 + 61

.

.

( ExampleKW 29KW59 .

:

In= PE 3 cos

32 | P a g e

50 = 93.79 = 1.75 93.79 = 164.132 160

20 = 38.8 = 1.75 38.8 = 67.9 63

5sec starting .

= 6 93.79 + 38.8 = 601.54 A

+

135 50 .

33 | P a g e

: (MCB miniature circuit breakes (: 3-9

"

.

.Dual element

:

) ( O/L -1

)( S.C -2

(-( )S.C OL (OC / --3

:

34 | P a g e

.

action.

.33 339

) (:MCB

.

35 | P a g e

. .

magnet 3 ")

. (

36 | P a g e

: MCB

- .

.

. .

39 3 . :

MCB over load . MCB

37 | P a g e

50KA KA 50

KA 50 MCB .

50KA

50KA

. fault . .

MCB .

38 | P a g e

: MCB: 11 -3

2/4/6/10/13/16/20/25/32/40/50/63/80/100/125

. 29

:MCB: 3-11

/ / / / B (1 / / / / C (2 / /// D (3

. D C

1.3 1.45 . over load . D C

. D C.

39 | P a g e

start B . B D D

:MCB: 3-12 : MCB

( ) (1 ( Number of pop(.) .) MCB (2

I

. I

MCB 25 .

MCB . 1

41 | P a g e

Example ) . 50 4

A b.temp=50

. 4 0.78

= 10 0.78 0.89 = 6.94

. 10A 10A