Tech. parameters

Unit

Data

20KA

25KA 

31.5KA

40KA

Rated voltage

KV

12

Maximum working voltage

KV

12

Rated current

A

630-1250

630-1250

630-2000

1250-4000

Rated short circuit breaking current

KA

20

25

31.5

40

Rated short circuit making current

KA

50

63

80

100

Rated peak withstand current

KA

50

63

80

100

4S rated short circuit withstand current

KA

20

25

31.5

100

Rated insulation level

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

KV

42(fracture 48)

Lightning impulse withstand voltage (rated before and after breaking)

75(fracture 84)

Rated operating sequence

Break-0.3s-Make and break-180s-Make and break

Mechanical life

Times

20000

Rated short circuit breaking current breaking times

Times

50

Rated making voltage of operating machinery (DC)

V

AC/DC 110/220

Rated breaking voltage of operating machinery (DC)

V

AC/DC 110/220

Clearance between open contacts

mm

11±1

Overtravel (contact spring compression length)

mm

3.5±0.5

Breaking and making asynchronism of three different phases

ms

≤2

Contact closing bounce time

ms

≤2

Average opening speed

m/s

0.9-1.2

Average closing speed

m/s

0.5-0.8

Breaking time

ms

20-60

Making time

ms

≤70

Main circuit voltage of each phase

(μΩ)

630≤50  1250≤45

1600-2500≤40

3150≤35

Allowable cumulative wear thickness of dynamic and static contacts

mm

30