thermal mag characteristics

23

Thermal MagneticCharacteristics andAdjustments• Range 24• Operation Settings 25• Examples 26• Time, Current and Temperature Curves 27-34• Special Applications 35

N S

23-35

24

XS400NJ

Access to Setting DialsFrom 125AF to 250AF the thermal adjustment is visible from the front of the MCCB. At 400AFand above a protective cover must be removed to gain access to the settings. To achieve accessto the settings the cover screw under the 'sealed' label must be removed.To adjust the individual trip settings turn the setting dial with a flat bladed screwdriver.Once set secure the cover and apply a new sealing label.Access to setting dials can be restricted using optional lead sealing facility.

Thermal Magnetic Characteristics and Adjustments

Range

CharacteristicsTemBreak thermal magnetic MCCBs are available from 50AF to 800AF. Depending on the typeof MCCB chosen the thermal and/or magnetic trip setting may be adjustable.

MCCB type Fixed Adjustable Fixed AdjustableThermal Thermal Magnetic Magnetic

XS50NB, XE100NS • – • –

XS125CS, XS125NS • – • –

XS125CJ, XS125NJ, XH125NJ – • • –

XS160NJ, XH160NJ – • • –

XE225NS • – • –

XS250NJ, XS250PJ, XH250NJ – • • –

XE400NS • – – •

XS400CJ, XS400NJ – • – •

XE600NS • – – •

XS630CJ, XS630NJ – • – •

XH800PS • – – •

XS800NJ – • – •

XS250NJ

• Thermal adjustment setting dial. • Spare sealing labels

• Sealed label

• Magnetic adjustment setting dial

• : Yes– : No

XS400NJ (cover removed)• Thermal adjustment setting dial

Thermal adjustment dial blanking kits areavailable for 125 and 250A frame MCCBs

25

Ir 0.8

0.63 1

xIn


Operation Settings

Thermal AdjustmentTemBreak MCCBs have a wide thermal adjustment range, one of thelargest on the market. The rated current 'Ir' is continuously adjustablefrom 63% to 100% of its nominal current 'In'. There are three mainpoints of calibration marked at 63%, 80% and 100%, as shown in thediagram below.

Magnetic AdjustmentMagnetic adjustment is available on MCCBs of 400AF and above. Themagnetic setting 'Im' is continuously adjustable from 500% to 1000% ofits rated current 'In'. There are five main points of calibration marked asmultiples of In ; 5, 6, 7.1, 8.5 & 10. These are shown in the diagrambelow.

Tim

e

Thermal adjustment range

0.63 0.8 1.0

x5x6 x7.1 x8.5 x10

Examples

1. XS125NJ/125A MCCB set at Ir = 0.8, the rated current is calculated as 125 x 0.8 = 100A

2. XS400NJ/400A MCCB set at Im = 6, the magnetic setting is calculated as 400 x 6 = 2400A

3. XS630NJ/630A MCCB set at Ir = 0.8 & Im = 5.0The rated current is calculated as 630 x 0.8 = 504AThe magnetic setting is calculated as 630 x 5 = 3150A

Note that the magnetic setting is a multiple of the nominal current In and not the rated current Ir.All thermal and magnetic trip settings are expressed as AC r.m.s. values.All MCCBs are calibrated at 45°C unless otherwise specified.

Current x I n

Tim

e

Current x I n

Breakers with adjustable magnetic trip

Note: The figures mentioned are standard values, if values other than those shown are required, please contact Terasaki.Note: Setting; 3-poles can be adjusted simultaneously with one adjustment dial.

Breaker Rated current (A) Magnetic trip current (A)Scale 10 8.5 7.1 6 5

XE400NS 250 2500 2125 1775 1500 1250300 3000 2550 2130 1800 1500350 3500 2975 2485 2100 1750400 4000 3400 2840 2400 2000

XS400CJ 250 2500 2125 1775 1500 1250XS400NJ 400 4000 3400 2840 2400 2000XE600NS 500 5000 4250 3550 3000 2500

600 6000 5100 4260 3600 3000XS630CJ 400 4000 3400 2840 2400 2000XS630NJ 630 6300 5355 4473 3780 3150XS800NJ 800 8000 6800 5680 4800 4000XH800PS 700 7000 5950 4970 4200 8500

800 8000 6800 5680 4800 4000

Im

6

5

7.18.5

10

xIn

Magnetic adjustment range

26


Examples

Example 1The XS160NJ set at its maximum thermalsetting of 160A experiences an overload of640A.What would be the tripping time?

SolutionAs the axis are 'percent' rated current theoverload as a percentage to rated current is

640160

The maximum and minimum on the curve arethe tolerance bands. Therefore at 400%overload the tripping time would be as follows:

Max. trip time ≈ 30 secondsMin. trip time ≈ 10 secondsAverage trip time ≈ 20 seconds

Due to strict quality control of themanufacturing and calibration processes, thecharacteristic curve of most MCCBs will followthe 'average' curve within the tolerance band.

= 400%

Time/current characteristic curves

Ambient compensating curves Example 2The XS160NJ is calibrated at 160A for 50°Cambient. If the temperature rose to 55°C whateffect would this have? (Assume that MCCBthermal setting is at maximum)

SolutionAt 55°C the ambient compensating factor is97%, i.e. 160 x 0.97 = 155A.In other words the XS160NJ would act as anMCCB set at 155A, in 55°C.

Percent Rated Current

Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Max.

Min.

130

120

110

100

900 10 20 30 40 50 60

Calibratedtemperature

5 15 25 35 45 55 6510 20 30 40 50 60 70

Calibrated at 40°C45°C50°C

Ambient temperature (°C)

Per

cent

cur

rent

ratin

g

160A (max.)

160A (min.)

27


Time, Current & Temperature Curves

XM30PB

Ambient compensating curves

Time/current characteristic curvesXM30PB


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Min.

Max.

25020015012510090

Per

cent

curr

ent r

atin

g

0 10 20 30 40 50 Calibrated at 40°C45°C50°C


5 15 25 35 45 55 10 20 30 40 50 60

Magnetic trip current

Rated curr. Mag. trip curr.(A) (A)0.7 9.8±2.81.4 19.6±5.62 28.0±8.02.6 36.4±10.44 56.0±16.05 70.0±20.08 112.0±32.010 140.0±40.012 168.0±48.0

28


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Max. (15, 20, 30, 40, 50A)

Min. (10A)

Min. (15, 20, 30, 40, 50A)

Max. (10A)


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Max. (60, 75, 100A)

Min. (10A)

Min. (60, 75, 100A)

Max. (10A)

Max. (15, 20, 30, 40, 50A)

Min. (15, 20, 30, 40, 50A)



XS50NB, XE100NS



Rated curr. Mag. trip curr.(A) (A)10 150±5015 225±7520 300±10030 450±15040 600±20050 750±250

15-50A

10A


Rated curr. Mag. trip curr.(A) (A)10 150±5015 225±7520 300±10030 450±15040 600±20050 750±25060 780±18075 975±225100 1300±300

15-100A

10A


Time/current characteristic curvesXE100NS

Time/current characteristic curvesXS50NB

130

120

110

100

90


Per

cent

cur

rent

ratin

g


0 10 20 30 40 50

250200150125100

90


20A

60A

40A

Per

cent

tripp

ing

time

15A

50A

30A

75A

100A

0 10 20 30 40 50 605 15 25 35 45 55 65

10 20 30 40 50 60 70

5 15 25 35 45 55 10 20 30 40 50 60



130

120

110

100

90


Per

cent

cur

rent

ratin

g


0 10 20 30 40 50

250200150125100

90


20A

40A

Per

cent

tripp

ing

time

15A

50A

30A

0 10 20 30 40 50 605 15 25 35 45 55 65

10 20 30 40 50 60 70

5 15 25 35 45 55 10 20 30 40 50 60



29


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

125A

20, 32, 50, 63, 100A

Max.

Min.


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

125A

20~100A

Max.

Min.



XS125CS, XS125NS, XS125CJ, XS125NJ, XH125NJ

Ambient compensating curves Ambient compensating curves

Time/current characteristic curvesXS125CJ, XS125NJ, XH125NJ

Time/current characteristic curvesXS125CS, XS125NS


Rated curr. Mag. trip curr.(A) (A)16 208±4220 260±5225 325±6532 420±8440 520±10450 650±13063 820±16480 1040±208100 1300±260125 1550±310

140

130

120

110

100

90

800 10 20 30 40 50 60


16, 40, 63, 80A

25, 32, 50A

5 15 25 35 45 55 6510 20 30 40 50 60 70



Per

cent

cur

rent

ratin

g

20, 100A

125A


Rated curr(A) Mag. trip curr.NRC (A)20 260±5232 420±8450 650±13063 820±164100 1300±260125 1550±310

150

140

130

120

110

100

90

800 10 20 30 40 50 60


50A, 20A(min.)

50, 20A(max.)

5 15 25 35 45 55 6510 20 30 40 50 60 70



Per

cent

cur

rent

ratin

g

100, 32A(max.)

63A(min.)

100, 32A(min.)

125A(min.)

125A(max.)63A(max.)

30


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Max.

Min.


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Max.

Min.



XE225NS, XS160NJ, XH160NJ, XS250NJ, XS250PJ, XH250NJ


Time/current characteristic curvesXS160NJ, XH160NJ, XS250NJ, XS250PJ, XH250NJ



Rated curr. Mag. trip curr.(A) (A)125 1250±250150 1750±350175 1750±350200 2250±450225 2250±450


Rated curr.(A) Mag. trip curr. NRC (A)160 1760±176250 2750±275

130

120

110

100

900 10 20 30 40 50 60


5 15 25 35 45 55 6510 20 30 40 50 60 70



Per

cent

cur

rent

rat

ing

160A (max.)

160A (min.)

250A (min.)

250A (max.)

130

120

110

100

900 10 20 30 40 50 60


5 15 25 35 45 55 6510 20 30 40 50 60 70



Per

cent

cur

rent

rat

ing 150A, 200A, 225A

175A

125A

31


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Max.

Min.

X5 X10



XE400NS, XS400CJ, XS400NJ


Time/current characteristic curves XS400CJ, XS400NJ



Rated curr. Mag. trip curr. (A)(A)250 2500±250300 3000±300350 3500±350400 4000±400

140

130

120

110

100

900 10 20 30 40 50 60


300-350A



Per

cent

cur

rent

rat

ing

5 15 25 35 45 55 6510 20 30 40 50 60 70

400-250A

Adjustable setting rangeof magnetic trip. Five stages within this range.


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Min.

Max.

X5 X10


Rated curr.(A) Magnetic trip curr.NRC (A)250 2500±250400 4000±400


140

130

120

110

100

900 10 20 30 40 50 605 15 25 35 45 55 65

10 20 30 40 50 60 70


250A max.400A max.



Per

cent

cur

rent

ratin

g

250A min.400A min.

32


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Min.

Max.

X5 X10


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Min.

Max.

X5 X10



XE600NS, XS630CJ, XS630NJ


Time/current characteristic curvesXS630CJ, XS630NJ



Rated curr. Magnetic trip curr.(A) (A)500 5000±500600 6000±600




130

120

110

100

900 10 20 30 40 50 60


630A (min)400A (min)



Per

cent

cur

rent

ratin

g

5 15 25 35 45 55 6510 20 30 40 50 60 70

630A (max)400A (max)


130

120

110

100

900 10 20 30 40 50 605 15 25 35 45 55 65

10 20 30 40 50 60 70




Per

cent

cur

rent

ratin

g 450A 500A

600A

33


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Min.

Max.

X5 X10


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Min.

Max.

X5 X10



XS800NJ, XH800PS


Time/current characteristic curvesXH800PS

Time/current characteristic curvesXS800NJ



Rated curr.(A) Magnetic trip curr.NRC (A)800 8000±800

130

120

110

100

900 10 20 30 40 50 60


800A(min)

800A (max)

5 15 25 35 45 55 6510 20 30 40 50 60 70



Per

cent

cur

rent

rat

ing




130

120

110

100

900 10 20 30 40 50 60


700A

800A

5 15 25 35 45 55 6510 20 30 40 50 60 70



Per

cent

cur

rent

rat

ing

34



XS1000ND, XS1250ND, XS1600ND, XS2000ND, XS2500ND

Time/current characteristic curvesXS1250ND,XS1600ND,XS2000ND, XS2500ND

Time/current characteristic curvesXS1000ND


Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

80 90 100

125

150

200

250

300

400

500

600

700

800

900

1000

1500

2000

2500

3000

4000

5000

6000

7000

8000

seco

ndm

inut

eho

ur

Scale4

Max.

Min.

Setting tolerance(Scale8)


Scale8

Rated Current (A)

Trip

ping

Tim

e

43

2

15040

30

20

108

654

3

2

15040

30

20

108

654

3

2

10.80.6

0.50.4

0.3

0.2

0.10.08

0.060.050.04

0.03

0.02

0.010.008

0.0060.005

seco

ndm

inut

eho

ur

1000

2000

1250

3000

5000

6000

8000

1000

0

2000

0

3000

0




130

120

110

100

900 10 20 30 40 50 60

Calibratedtemperature1000A(min)

5 15 25 35 45 55 6510 20 30 40 50 60 70



Per

cent

cur

rent

rat

ing


Rated curr.(A) Magnetic trip curr.NRC (A)800 8000±800


Adjustable settingrange of magnetictrip. Five stageswithin this range.

Magnetic trip current (adjustable)

Rated current (A) Magnetic trip current (A)

Scale 8 7.1 6.3 5 4

1000 8000 7100 6300 5000 4000

NOTE: Setting tolerance + 10% at 8000A and + 25% for other settings.

35


Special Applications

The steady state current produced by a genera-tor under a fault condition can be as low as 3 to5 times the rated full load current. In this situationit is advisable to use a 'generator protection'MCCB. This has its magnetic setting calibratedlow enough to trip quickly on low generatorfaults, as shown in the table on the right. Thethermal part of the characteristic curve is thesame for the corresponding MCCB.

Generator protection INST. settingsGenerator protectionBreaker Rating Trip current (A) X InXS125NJ (SRX5) 20 100 5

32 160 5 50 250 5 63 315 5100 500 5125 625 5

XS125NJ-G 20 95 4.75 32 120 3.75 50 150 3 63 200 3100 300 3125 375 3

XS160NJ-G 160 400 2.5XS250NJ-G 250 625 2.5XS400NJ-G 250 LO=625 2.5

250 HI=1250 5400 LO=1000 2.5400 HI=2000 5

XS630NJ-G 400 LO=1000 2.5400 HI=2000 5630 LO=1600 2.5630 HI=3150 5

XS800NJ-G 800 LO=2000 2.5800 HI=4000 5

All standard TemBreak thermal magnetic MCCBsare suitable for DC application up to 250V DC.Refer to Section 2, Ratings and Specificationsfor details of DC breaking capacity up to 250V.

Above 250V DC, special versions of the standardMCCBs are required, as shown in the tableopposite. Refer to the connection diagram below.

D.C. Application

(1) The breaker is magnetic trip only without overload protection.(2) UVT can not be fitted.

Note that the DC ratings shown apply when the time constant of thecircuit is:• less than 2.0 ms at approximately rated current (In)• less than 2.5 ms for overloads of between In and 2.5xIn• less than 7 ms for short circuits of 10 kA or less• less than 15 ms for short circuits greater than 10 kA

~

– +

Type breaking capacity (kA) 3 poles in series350V DC 500V DC 600V DC

XS125NJ-D 10 7.5 5

XH125NJ-D 10 7.5 5

XS250NJ-D 10 7.5 5

XH250NJ-D 20 15 10

XS400NJ-D 20 15 15

XS630NJ-D 30 20 30

XS800NJ-D 30 20 20

XS1000ND (2) 30 20 20

XS1250ND (1) (2) 30 20 20

XS1600ND (1) (2) 30 20 20

XS2000ND (1) (2) 30 20 20

XS2500ND (1) (2) 30 20 20SOURCE

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Three (3) poles in series

All Terasaki's thermal-magnetic TemBreakMCCBs are available as magnetic-trip onlyversions. These have the same fit and form asthe standard versions, but do not have thermaltripping elements. They are ttherefore suitableto be used as Short Circuit Protective Devices inmotor starters.

Magnetic only MCCBs

thermal mag characteristics

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