2

Complementary technical information

Tripping curves

In

t

Thermal tripping limits

Electromagnetic tripping limits

min. max.

The following curves show the total fault current breaking time, depending on its amperage. For example: based on the curve on page 3, an iC60 circuit breaker of curve C, 20 A rating, will interrupt a current of 100 A (5 times the rated current In) in:

b 0.45 seconds at least b 6 seconds at most.

The circuit breakers’ tripping curves consist of two parts: b tripping of overload protection (thermal tripping device): the higher the current, the

shorter the tripping time b tripping of short-circuit protection (magnetic tripping device): if the current exceeds

the threshold of this protection device, the breaking time is less than 10 milliseconds.For short-circuit currents exceeding 20 times the rated current, the time-current curves do not give a sufficiently precise representation. The breaking of high short-circuit currents is characterized by the current limiting curves, in peak current and in energy. The total breaking time can be estimated at 5 times the value of the ratio (I2t)/(Î)2.

Verification of the discrimination between two circuit breakers By superimposing the curve of a circuit breaker on that of the circuit breaker installed upstream, one can check whether this combination will be discriminating in cases of overload (discrimination for all current values, up to the magnetic threshold of the upstream circuit breaker). This verification is useful when one of the two circuit breakers has adjustable thresholds; for fixed-threshold devices, this information is provided directly by the discrimination tables.To check discrimination on short circuit, the energy characteristics of the two devices must be compared.

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79

3

Complementary technical information

Tripping curvesAccording to IEC/EN 60898-1 standards

Alternative current 50/60 HziC60a/N/H/LAccording to IEC/EN 60898-1 (reference temperature 30°C)

Curves B, C, D rating up to 4 A Curves B, C, D rating 6 A to 63 A

DB

1241

80

t(s)

I / In

0,01

0,1

1

10

100

1000

1 3...5 5...10 10...14

C DB

DB

1241

85

t(s)

0,01

0,1

1

10

100

1000

I / In1

C DB

3...5 5...10 10...14

C120N/H DPN, DPN N, DPN H (circuit-breaker and residual current device)According to IEC/EN 60898-1 (reference temperature 30°C) According to IEC/EN 60898-1 (reference temperature 30°C)

Curves B, C, D Curves B, C, D

DB

1242

07

t(s)

I / In

0,01

0,1

1

10

100

1000

1

C DB

3...5 5...10 10...14

DB

1242

08

t(s)

I / In

0,01

0,1

1

10

100

1000

1

C DB

3...5 5...10 10...14

3600 s for I/In = 1.453600 sforI/In = 1.13

60 s for I/In = 2.55

1 s for I/In = 2.55

3600 s for I/In = 1.453600 sforI/In = 1.13

60 s for I/In = 2.55

1 s for I/In = 2.55

3600 s for I/In = 1.453600 sforI/In = 1.13

60 s for I/In = 2.55

1 s for I/In = 2.55

3600 s for I/In = 1.453600 sforI/In = 1.13

60 s for I/In = 2.55

1 s for I/In = 2.55

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Complementary technical information

Tripping curvesAccording to IEC/EN 60898-1 standards

Alternative current 50/60 HziK60 C60According to IEC/EN 60898-1 (reference temperature 30°C) According to IEC/EN 60898-1 (reference temperature 30°C)

Curves B, C Curves B, C, D

DB

1242

09

t(s)

I / In

0,01

0,1

1

10

100

1000

1 3...5 5...10

CB

DB

4058

22

t(s)

0,01

0,1

1

10

100

1000

I / In

1 3...5 5...10 10...14

C DB

3600 s for I/In = 1.453600 sforI/In = 1.13

60 s for I/In = 2.55

1 s for I/In = 2.55

3600 s for I/In = 1.453600 sforI/In = 1.13

60 s for I/In = 2.55

1 s for I/In = 2.55

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Complementary technical information

Tripping curvesAccording to IEC/EN 60947-2 standards

Alternative current 50/60 HziC60N/H/L MCB and iC60 RCBOAccording to IEC/EN 60947-2 for MCB and IEC/EN 61009-1 for RCBO (reference temperature 50°C)

Curves B, C, D rating up to 4 A Curves Z, K rating up to 4 A

DB

1241

81

t(s)

I / In

0,01

0,1

1

10

100

1000

14±20% 8±20% 12±20%

C DB

DB

1241

82

I / In

t(s)

0,01

0,1

1

10

100

1000

KZ

13±20% 12±20%

Curves B, C, D rating 6 A to 63 A Curves Z, K rating 6 A to 63 A

DB

1241

86

t(s)

0,01

0,1

1

10

100

1000

I / In

1

DB C

4±20% 8±20% 12±20%

DB

1241

87

I / In

1

t(s)

0,01

0,1

1

10

100

1000

KZ

3±20% 12±20%

3600 s for I/In= 1.3 3600 s for I/In = 1.3

3600 s for I/In = 1.33600 s for I/In = 1.3

3600 sforI/In = 1.05

3600 sforI/In = 1.05

3600 sforI/In = 1.05

3600 sforI/In = 1.05

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Complementary technical information

Tripping curvesAccording to IEC/EN 60947-2 standards

Alternative current 50/60 HzReflex iC60N/H NG125a/N/H/LAccording to IEC/EN 60947-2 (reference temperature 50°C) According to IEC/EN 60947-2 (reference temperature 40°C)

Curves B, C, D Curves B, C, D

DB

1242

10

t(s)

I / In

0,01

0,1

1

10

100

1000

1

C DB

4±20% 8±20% 12±20%

DB

1242

11

t(s)

I / In

0,01

0,1

1

10

100

1000

1

C DB

4±20% 8±20% 12±20%

C60According to IEC/EN 60947-2 (reference temperature 50°C)

Curves B, C, D

DB

4058

23

t(s)

0,01

0,1

1

10

100

1000

C DB

I / In1

4±20% 8.5±20%12±20%

3600 s for I/In= 1.3 3600 s for I/In = 1.33600 sforI/In = 1.05

3600 sforI/In = 1.05

3600 s for I/In= 1.3 3600 sforI/In = 1.05

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Complementary technical information

Tripping curvesAccording to IEC/EN 60947-2 standards

Motor curveiC60L-MA NG125L-MAAccording to IEC/EN 60947-2 According to IEC/EN 60947-2

Curve MA Curve MA

DB

1241

90

t(s)

0,01

0,1

1

10

100

1000

I / In

1

MA

12±20%

DB

1242

12

t(s)

0,01

0,1

1

10

100

1000

I / In

1

MA

12±20%

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Complementary technical information

Tripping curvesAccording to IEC/EN 60947-2 standards

Direct currentiC60N/H/LAccording to IEC/EN 60947-2 (reference temperature 50°C)

Curves B, C, D rating up to 4 A Curves Z, K rating up to 4 A

DB

1241

84

t(s)

0,01

0,1

1

10

100

1000

I / In

1

B C D

5.7±20% 11.3±20% 17±20%

DB

1244

50

I / In

t(s)

0,01

0,1

1

10

100

1000

KZ

14.2±20% 17±20%

Curves B, C, D rating 6 A to 63 A Curves Z, K rating 6 A to 63 A

DB

1241

88

t(s)

0,01

0,1

1

10

100

1000

I / In

B C D

15.7±20% 11.3±20% 17±20%

DB

1244

51

I / In

t(s)

0,01

0,1

1

10

100

1000

KZ

14.2±20% 17±20%

3600 sforI/In = 1.05

3600 s for I/In = 1.3 3600 sforI/In = 1.05

3600 s for I/In = 1.3

3600 s for I/In = 1.33600 sforI/In = 1.05

3600 s for I/In = 1.33600 sforI/In = 1.05

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Complementary technical information

Tripping curvesAccording to IEC/EN 60947-2 standards

Direct currentC60H-DC C60According to IEC/EN 60947-2 (reference temperature 25°C) According to IEC/EN 60947-2 (reference temperature 50°C)

Curves B, C, K Curves B, C, D

DB

4061

78

t(s)

0.01

0.1

1

10

100

1000

I / In

1 3...7 10...14

7...10

B C K

DB

4058

40

t(s)

0.01

0.1

1

10

100

1000

I / In

1 5.7±20%

B C D

12±20%

17±20%

NG125a/N/H/LAccording to IEC/EN 60947-2 (reference temperature 40°C)

Curves B, C, D

DB

1241

84

t(s)

I / In

0,01

0,1

1

10

100

1000

C DB

15.7±20% 11.3±20%17±20%

3600 sforI/In = 1.05

3600 s for I/In = 1.3

3600 sforI/In = 1.05

3600 sforI/In = 1.05

3600 s for I/In = 1.33600 s for I/In = 1.3

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The circuit-breaker characteristics chosen depend on the type of load downstream of the installation.The rating depends on the size of the cables to be protected and the curves depend on the load inrush current. Product selection according to the load inrush current When certain "capacitive" loads are switched on, very high inrush currents appear during the first milliseconds of operation. The following graphs show the average non-tripping curves of our products for this time range (50 μs to 10 ms).

iC60D

B12

4249

Ipeak/In

t(ms)

0,01

0,1

1

10

100 1000101

Curve DCurve B

Curve C

NG125 / C120

DB

1242

50

t(ms)

0,01

0,1

1

10

100 1000101Ipeak/In

Curve DCurve B

Curve C

This information allows us to select the most appropriate product, according to the load specifications: curve and rating.

ExampleWhen an iC60 is used with a load with current peaks in the order of 200 In during the first 0.1 millisecond, a curve C or D product must be installed.

Ipeak/In

t(ms)

0,01

0,1

1

10

100 1000101

Curve DCurve B

Curve C

0,1

100 200 1000

0,1

200

Complementary technical information

Tripping curvesCoordination with loads

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Complementary technical information

Tripping curves

2.9 5/10/2014 Add DPN H page 3 JPM2.8 3/09/2013 Add RCBO in iC60 AC table page 5 Sedoc2.7 25/04/2013 Change IIn/ C60, (curve C60H-DC, C60) JPM2.6 11/03/2013 Changed C60H-DC curves page 9 Sedoc2.5 24/01/2013 Add page 10 "Coordination with loads" Sedoc2.4 13/07/2012 Add C60 curves Sedoc2.3 4/07/2012 Deleted C60 curves Sedoc2.2 06/06/2012 Change texts and add C60 curves Sedoc2.1 24/08/2011 Change Z, K curves pages 8 Sedoc2.0 23/05/2011 InDesign CS5 Sedoc1.2 16/04/2011 Add new curves C120, DPN, iK60, NG125, C60H-DC Sedoc1.1 25/03/2011 New curves Sedoc1.0 14/10/2009 Creation SedocIndice Date Modification Name

Evolutions

This page must be removed before publis

hing

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