Current Discrimination
Circuit Breakers

Current Discrimination - Prospective Fault Levels to which Discrimination is achieved (A)

Upstream:
Memshield 2 Type C MCB to Memshield 2 N Frame MCCB.
Downstream:
Memshield 2 Type 2 Type C MCB to Memshield 2 M Frame MCCB.

The discrimination data shown here is for guidance purposes only, utilising the specific Icu values of the MCCBs indicated.

(E) Indicates electronic type. Shaded area indicates full discrimination to the fault level of the downstream circuit breaker. *6000A for type D MCBs
  Upstream

Breaker Type

Memshield 2
MCB

Memshield 2
G Frame MCCB

Memshield 2
F Frame MCCB

J
Frame

K
Frame

L
Frame

L (E)
Frame

M (E)
Frame

N (E)
Frame

Breaker Rating (A)

1

2

4

6

8

10

13

16

20

25

32

40

50

63

16

20

32

40

50

63

80

100

125

16

20

32

40

50

63

80

100

125

160

200

200

250

320

400

630

800

630

800

1000

1250

1600

Fault Rating

kA

10

10

10

10

10

10

10

10

10

10

10

10

10

10

16

16

16

16

16

16

16

16

16

25

25

25

25

25

25

25

25

25

25

25

35

35

35

35

50

50

50

50

65

65

85

Breaker Rating
(A)

Memshield 2
MCB

1

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7000

8000

8000

9000

9000

10000

10000

10000

10000

7000

8000

8000

9000

9000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

2

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7000

8000

8000

9000

9000

10000

10000

10000

10000

7000

8000

8000

9000

9000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

4

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7000

8000

8000

9000

9000

10000

10000

10000

10000

7000

8000

8000

9000

9000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

6

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7000

8000

8000

9000

9000

10000

10000

10000

10000

7000

8000

8000

9000

9000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

8

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7000

7000

8000

8000

9000

9000

10000

10000

-

7000

7000

8000

8000

9000

9000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7000

7000

8000

8000

9000

9000

10000

10000

-

7000

7000

8000

8000

9000

9000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

13

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7000

7000

8000

8000

9000

9000

10000

-

-

7000

7000

8000

8000

9000

9000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

16

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7000

7000

8000

8000

9000

9000

10000

-

-

7000

7000

8000

8000

9000

9000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

20

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7000

7000

8000

8000

9000

9000

-

-

-

7000

7000

8000

8000

9000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

25

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

5000

6000

6000

7000

-

-

-

-

-

5000

6000

6000

10000

10000

8000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

32

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

5000

6000

6000

7000

-

-

-

-

-

5000

6000

6000

10000

10000

8000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

10000

40

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

5000

6000

6000

-

-

-

-

-

-

5000

6000

10000

10000

7000

10000

10000

10000

10000

10000

10000

10000*

10000*

10000*

10000*

10000*

50

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

5000

5000

-

-

-

-

-

-

-

5000

10000

10000

6000

10000

10000

10000

10000

10000

10000

10000*

10000*

10000*

10000*

10000*

63

10

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

4000

-

-

-

-

-

-

-

-

10000

10000

5000

10000

10000

10000

10000

10000*

10000*

10000*

10000*

10000*

10000*

10000*

Breaker Type

Memshield 2
MCB

Memshield 2
G Frame MCCB

Memshield 2
F Frame MCCB

J
Frame

K
Frame

L
Frame

L (E)
Frame

M (E)
Frame

N (E)
Frame

Breaker Rating (A)

1

2

4

6

8

10

13

16

20

25

32

40

50

63

16

20

32

40

50

63

80

100

125

16

20

32

40

50

63

80

100

125

160

200

200

250

320

400

630

800

630

800

1000

1250

1600

Fault Rating

kA

10

10

10

10

10

10

10

10

10

10

10

10

10

10

16

16

16

16

16

16

16

16

16

25

25

25

25

25

25

25

25

25

25

25

35

35

35

35

50

50

50

50

65

65

85

Breaker Rating
(A)

Memshield 2
G Frame MCCB

16

25

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

320

400

500

630

800

1000

1250

-

75

320

400

500

630

800

1000

1250

1600

2000

2000

2500

3200

4000

11500

16000

16000

16000

16000

16000

16000

20

25

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

110

400

500

630

800

1000

1250

-

-

150

400

500

630

800

1000

1250

1600

2000

2000

2500

3200