No.

Tech. parameters

Unit

Data

20KA

25KA

31.5KA

40KA

1

Rated voltage

KV

12

2

Maximum working voltage

KV

12

3

Rated current

A

630-1250

630-1250

630-2000

1250-4000

4

Rated short circuit breaking current

KA

20

25

31.5

40

5

Rated short circuit making current

KA

50

63

80

100

6

Rated peak withstand current

KA

50

63

80

100

7

4S rated short circuit withstand current

KA

20

25

31.5

100

8

Rated insulation level

Power-frequency withstand voltage (rated before and after breaking capacity)

KV

42(fracture 48)

Lightning impulse withstand voltage (before and after Yan Ding breaking)

75(fracture 84)

9

Rated operating sequence

Minute-0.3s-Total minute-180s-Total minute

10

Mechanical life

Times

20000

11

Rated short circuit breaking current breaking times

Times

50

12

Rated closing voltage of operating machinery (DC)

V

AC/DC 110/220

13

Rated opening voltage of operating machinery (DC)

V

AC/DC 110/220

14

Clearance between open contacts

mm

11±1

15

Overtravel (contact spring compression length)

mm

3.5±0.5

16

Breaking and making asynchronism of three different phase

ms

≤2

17

Contact closing bounce time

ms

≤2

18

Average opening speed

m/s

0.9-1.2

19

Average closing speed

m/s

0.5-0.8

20

Breaking time

ms

20-60

21

Making time

ms

≤70

22

Main circuit resistance of each phase

(μΩ)

630≤50 1250≤45

1600-2500≤40

3150≤35

23

Allowable cumulative wear thickness of dynamic and static contacts

mm

30