str 28d trip curve

8/18/2019 STR 28D Trip Curve

1/11Merlin Gerin78

Masterpact: complementary technical information

tripping curves

STR 18 M

.5 .6 .8 1 2 3 4 5 6 8 10 20 30 50 100 200 300.001

.002

.01

.02

.05

.1

.2

.5

1

2

5

10

20

.005

50

100

200

500

1000

2000

5000

10000

I = 2 x In… Max (*)

40 60 80

(*)Max

In (A)

Max = In x ...

1200/1600 2000 2500 3000/3200 4000/5000/6300800/1000

28 28 24 20 14 12 10

630

t(s)

x In

E

3 0 7 0 8


2/1179Merlin Gerin

STR 28 D

.5 .6 .8 1 2 3 4 5 6 8 10 20 3 4 5 6 8 10 20 30.001

.002

.01

.02

.05

.1

.2

.5

1

2

5

10

20

50

100

200

500

1000

2000

5000

10000

.005

Ir = 0,4 …1 x In

Inst (*)

t(s)

x Ir x In

Im = 1,5 …10 x Ir

E 3 0 7 0 9

Inst (*): fixed pick-up at 10 In


3/11

Merlin Gerin80


tripping curves (cont.)

STR 38 S

.5 .6 .8 1 2 3 4 5 6 8 10 20 3 4 5 6 8 10 20 30.001

.002

.01

.02

.05

.1

.2

.5

1

2

5

10

20

50

100

200

500

1000

2000

5000

10000

.005

0,3

0,2

0,1 0,1

0

Ir = 0,4 …1 x In

I2t ON

I2t OFF

Inst (*)

0,3

0,4

0,2

(*)Inst

In (A)

I = In x ... (N-H)

1200/1600 2000 2500 3000/3200 4000/5000/6300

I = In x ... (L)

800/1000

28 12

-

630

t(s)

x Ir x Ir

Im = 1,5 …10 x Ir

14

28

10

24

8

20

6

14

6

10

-

E 3 0 7 1 1


4/11

81Merlin Gerin

STR 58 U

.5 .6 .8 1 2 3 4 5 6 8 10 20 3 4 5 6 8 10 20 30.001

.002

.01

.02

.05

.1

.2

.5

1

2

5

10

20

50

100

200

500

1000

2000

5000

10000

.005

0,3

0,2

0,1

0,3

0,2

0,1

Ir = 0,4 …1 x In

tr = 15…480s

I2t ON

I = 2 x In…Max (*)

I2t OFF

0,4

0

(*)Max

In (A)

Max = In x ... (N-H)

Max = In x ... (L)

t(s)

x Ir x In

Im = 1,5 …10 x Ir

1200/1600800/1000

28

630

14

28

10

24

8

2000 2500 3000/3200 4000/5000/6300

12

-

20

6

14

6

10

-

E 3 0 7 1 2


5/11Merlin Gerin82



.05 .06 .08 .1 .2 .3 .4 .5 .6 .8 1 2 3 4 5 6 8 10 20 30.001

.002

.01

.02

.05

.1

.2

.5

1

2

5

10

20

.005

50

100

200

500

1000

2000

5000

10000

0,1

I2t ON

I2t OFF

Ih = 0,1…1 x InMax 1200A

0,2

0,3

0,4

t(s)

x In

In: CT ratingIh: earth fault protection pick-up (delay: th)

E

30713

STR 38 S/STR 58 U: earth fault protection


6/1183Merlin Gerin

.05 .06 .08 .1 .2 .3 .4 .5 .6 .8 1 2 3 4 5 6 8 10 20 30.001

.002

.01

.02

.05

.1

.2

.5

1

2

5

10

20

.005

50

100

200

500

1000

2000

5000

10000

tr1 = tr / 2

Ir = 0,4…1 x In

Ic1 = 0,8…1 x Ir

Ic2 = 0,5…1 x Ir

tr2 = tr / 4

t(s)

x In

Ir: LT protection current setting (delay: tr)Ic1: load-shedding pick-up 1 (delay: tr1)Ic2: load-shedding pick-up 2 (delay: tr2)

E 3 0 7 1 0

STR 38 S/STR 58 U: load monitoring


7/11Merlin Gerin84



STR 68 U

.5 .6 .8 1 2 3 4 5 6 8 10 20 30 40 50 60 80 100 200 300.001

.002

.01

.02

.05

.1

.2

.5

.005

1

2

5

10

20

50

100

200

500

1000

2000

5000

10000

Ir = 0,4 …1 x In

tr = 15…480s

I2t ON

I2t OFF

I (*)

0,4

0,3

0,2

0,1 0,1

0,2

0,3

0,4

t(s)

x In kA

Im = 0,4 …15 x In

(*)I

In (A)

type H2 : I = 1,6 kA ... 65 kA

1000

type H1 : I =

type L1 : I =

In ou 1,6 kA ... 50 kA

1,6 kA ... 11 kA

800 1250 1600 2000 2500 3200 4000 5000 6000

In ... 75 kA

In ... 15 kA

E

30714


8/1185Merlin Gerin

STR 68 U: earth fault protection

E 3

0 7 1 6

.05 .06 .08 .1 .2 .3 .4 .5 .6 .8 1 2 3 4 5 6 8 10 20 30.001

.002

.01

.02

.05

.1

.2

.5

1

2

5

10

20

.005

50

100

200

500

1000

2000

5000

10000

0,1

Ih = 0,2…1 x In…Max. 1200A

0,4

0,3

0,2

t(s)

x In

In: CT ratingIr: LT protection current setting (delay: tr)Im: ST protection pick-up (delay: tm)INST: instantaneous protection pick-up

Ih: earth fault protection pick-up (delay: th)(0, 0.1, …: time delay settings)


9/11Merlin Gerin86



.05 .06 .08 .1 .2 .3 .4 .5 .6 .8 1 2 3 4 5 6 8 10 20 30.001

.002

.01

.02

.05

.1

.2

.5

1

2

5

10

20

.005

50

100

200

500

1000

2000

5000

10000

tr = 15…480s

Ir = 0,4…1 x In

Ic1 = 0,2…1 x In

Ic2 = 0,2…1 x In

tr1 = tr / 2

tr2 = tr / 4

t(s)

x In

Ic1: one load-shedding pick-up (delay: tr1)Ic2: another load-shedding pick-up (delay: tr2)

In: CT ratingIr: LT protection current setting (delay: tr)

E3

0715

STR 68 U: load monitoring with 2 load limits


10/1187Merlin Gerin

STR 68: load monitoring with 1 load-shedding and 1 load-reconnection pick-up

E 3

0 7 1 7

.05.06 .08 .1 .2 .3 .4 .5 .6 .8 1 2 3 4 5 6 8 10 20 30.001

.002

.01

.02

.05

.1

.2

.5

1

2

5

10

20

.005

50

100

200

500

1000

2000

5000

10000

tr = 15…480s

Ir = 0,4…1 x In

Ic1 = 0,2…1 x In

Ic2 = 0,2…1 x In

tr1 = tr / 2

tr2 = 60s

t(s)

x In

Ic1: load-shedding pick-up (delay: tr1)Ic2: load-reconnection pick-up 2 (delay: tr2)


11/11


effect of ambient temperature

ambient temperature The electrical and mechanicalcharacteristics are specified for an ambient

temperature between –5 and +60 °C.Masterpact circuit breakers operate from –10 and +70 °C.First closing minimum temperature: –30 °C.In addition, Masterpact circuit breakers

comply with IEC standards 68.2.1 and68.2.2: exceptional storage temperaturefrom: –50 to +100 °C.

Current rating (A) as a function ambient temperature (°C)

Masterpact M 08 N/ H/ L M 10 N/H /L M 12 N M 12H M1 2L M 16 N/ H M 16 L M 20 N/ H M 20 L M 25 N/ H M 25 L M 32 H M4 0H M 50 H M6 3H

version connection T °Cdrawout front or rear 40 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 150 3 800 5 000 6 000

horizontal 45 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 350 3 080 3 650 4 750 5 700

50 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 430 2 250 3 000 3 500 4 500 5 400

55 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 350 2 150 2 900 3 300 4 250 5 100

60 800 1 000 1 200 1 250 1 250 1 550 1 500 1 900 1 900 2 250 2 000 2 800 3 100 4 000 4 800

rear vertical 40 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 4 000 5 000 6 300

45 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 3 800 5 000 6 000

50 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 100 3 600 5 000 5 700

55 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 350 3 000 3 400 5 000 5 400

60 800 1 000 1 250 1 250 1 250 1 550 1 600 1 900 1 900 2 400 2 200 2 900 3 200 4 700 5 100

fixed front or rear 40 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 4 000 5 000 –

horizontal 45 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 4 000 5 000 –

50 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 4 000 5 000 –

55 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 3 900 5 000 –

60 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 300 3 100 3 800 5 000 – rear vertical 40 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 4 000 5 000 –

45 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 4 000 5 000 –

50 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 4 000 5 000 –

55 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 200 4 000 5 000 –

60 800 1 000 1 250 1 250 1 250 1 600 1 600 2 000 2 000 2 500 2 500 3 100 3 900 5 000 –

Power dissipation and resistance between inputs/outputs

power(1) drawout 160 250 360 230 360 390 460 365 500 520 780 803 1 250 1 150 1 200

dissipated (W) fixed 66 103 150 100 150 170 220 180 250 260 390 500 780 700 –

input/output(2) drawout 53 53 53 32 50 32 31 18 23 17 23 15 15 9 9resistance (µΩ) fixed 33 33 33 16 36 16 12 9 10 8 10 10 10 8 –

(1) Values measured at In, 50/60 Hz for a 3-pole or 4-pole breaker.(2) Values measured per pole.

The table below indicates the maximum

current rating, for each connection type, as afunction of the ambient temperature aroundthe circuit breaker and the busbars.

str 28d trip curve

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