Technical specifications

General technical details

Some values do not apply to 3KF with rear flat terminals – you will find further information in the Equipment Manual 3KF Switch Disconnectors with Fuses.

Standards

IEC 60947-1, IEC 60947-3, VCE 0660 Part 107

Size

1

2

3

4

5

Rated uninterrupted current Iu

A

32

63

80

125

160

250

400

630

800

Conventional free-air thermal current Ith1)

A

32

63

80

125

160

250

400

630

800

For fuse links acc. to IEC 60269-2

00 and 000

1 and 0

2 and 1

3 and 2

Rated operational voltage Ue

  • At 50 Hz/60 Hz AC (tolerance up to +10% permissible)

V

690

  • At DC (3 conducting paths series-connected)

V

440

  • At DC (2 conducting paths series-connected)

V

220

Rated insulation voltage Ui

V

1000

Rated impulse withstand voltage Uimp

kV

12

Overvoltage category

IV

1) Max. permissible operating temperature at connections 125 °C

Operating and short-circuit behavior

Standards

IEC 60947-1, IEC 60947-3, VCE 0660 Part 107

Size

1

2

3

4

5

Rated operational current Ie1)

  • At AC-21A, AC-22A, AC-23A, 400 … 690 V

A

32

63

80

125

160

250

400

630

800

  • At DC-21A, DC-22A, DC-23A, 220 … 440 V

A

32

63

80

125

160

250

400

630

800

Motor switching capacity AC-23A 2)

  • At 400 V

kW

15

30

37

55

90

132

220

355

400

  • At 500 V

kW

18.5

37

55

75

110

160

280

400

560

  • At 690 V

kW

30

55

75

110

132

250

400

630

800

Rated short-time withstand current Icw

(with t = 1 s, rms value, 690 V AC/440 V DC)

kA

2.5

5

8

12

22

Rated short-circuit making capacity Icm

(At 690 V AC/440 V DC)

kA

3.5

7.65

13.6

24

44

Rated conditional short-circuit current with fuse3)

  • At 400/500 V AC

kA

100

  • At 690 V AC

kA

100

80

Let-through current Ic combined with fuse3)

  • At 400/500 V AC

kA

10.4

18.2

28.7

39.4

58.5

  • At 690 V AC

kA

11.2

16.87

30.31

41.14

49.95

Let-through I2t value combined with fuse3)

  • At 400/500 V AC

kA2s

33.2

150.6

437.0

1205

4100

  • At 690 V AC

kA2s

40.7

89.64

490.1

1300

2050

Let-through current Ic of usable fuses, max.

  • At 400/500 V AC

kA

11.8

18

33.7

37.1

77.4

  • At 690 V AC

kA

11.5

25.5

37.7

47

65

Let-through I2t value of usable fuses, max.

  • At 400/500 V AC

kA2s

34

223

1500

2150

10400

  • At 690 V AC

kA2s

55

360

940

2600

7000

Power loss per pole with thermal current Ith (plus fuses)

W

0.4

1.7

2.8

4.2

7.2

15

26

40

50

Maximum power loss of the usable fuses (per fuse)

  • For 3KF LV HRC

W

6.5

7.5

8.5

11

12

25.5

34

48

60

  • For 3KF SITOR

W

7

8

12

20

26

36

55

68

85

Service life, operating cycles

  • Mechanical

15000

12000

10000

8000

6000

  • Electrical, at AC-23A, 690 V / 50 … 60 Hz

6000

5000

4000

2000

1000

  • Electrical, at AC-23A, 440 V / 50 … 60 Hz

10000

8000

5000

3000

1500

  • Electrical, at DC-23A, 440 V

1500

1000

500

1) Values valid even at +10% line voltage tolerance in case of AC

2) Values are provided as a guide only and may vary depending on the make of motor

3) Valid for combination of 3KF and fuse type 3NA/3ND, characteristic gG/aM

Degree of protection (operator side)

Standards

IEC 60947-1, IEC 60947-3, VCE 0660 Part 107

Size

1

2

3

4

5

Degree of protection for 3KF LV HRC

  • With masking plate or cable connection cover

IP20

  • Without masking plate or terminal cover

IP20

IP00

Degree of protection for 3KF SITOR

  • With masking plate or cable connection cover

IP00

Ambient conditions

Standards

IEC 60947-1, IEC 60947-3, VCE 0660 Part 107

Size

1

2

3

4

5

  • Ambient temperature during operation

°C

-25 ... +70

  • Ambient temperature during storage

°C

-50 … +80

  • Mounting position

Any

Main conductor connection

Standards

IEC 60947-1, IEC 60947-3, VCE 0660 Part 107

Size

1

2

3

4

5

Conductor cross-section, max.

mm2

25

95

240

2 x 150

2 x 300

Busbar systems, max. dimensions (number x width x thickness)

mm

1 x 9 x 2

1 x 20 x 3

1 x 25 x 3

1 x 30 x 10

1 x 50 x 10

Tightening torque

Nm

5 ... 6.5

15 ... 22

30 ... 44

30 ... 44

50 ... 75