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CKFZ-12 Vacuum Load Break Switch

CKFZ-12D/630-20 type indoor medium-voltage vacuum load break switch (hereinafter referred to as the load switch) and CKFZR-12D/T125-31.5 vacuum load switch - fuse combination unit(hereinafter referred to as the "combination unit") are solely researched and developed by Zhuhai Comking Electric Co., Ltd. based on advanced technology at home and abroad under rated voltage of 12kV. It can be used for industrial and mining enterprises, high-rise buildings, residential areas, schools, hospitals, railway stations, docks etc. distribution system as indoor three phase network power supply equipment or terminal power supply equipment. 

1 Vacuum bubble is installed in the epoxy resin insulation tube, the insulation performance is stable.
2 There is a clear break point, with high breaking capacity.
3 The isolation blade, load switch and door interlock mechanically each other.
4 New cabinet door interlocking mechanism, automatically meet the "five prevention" requirements.
5. H type high breaking vacuum switch, can open 20kA short-circuit current. With the protection device, it can realize various protection functions.
6 This product won the national utility model patent.

 

 

Description

Unit

Load Switch

Switch-fuse Combination

Vacuum Switch(H)

Rated voltage

kV

12

12

12

Rated frequency

Hz

50

50

50

Rated current

A

630

125

630~125

Rated prospective short-circuit breaking current(fuse)

kA

31.5

Rated breaking cable charging current

A

20

20

20

Rated short-circuit making current(peak)

kA

50

50

50

Rated short-circuit breaking current(fuse)

kA

31.5

Rated short-time withstand current

kA

20

20

Rated peak withstand current

kA

50

50

Rated short-time withstand current duration(load switch)

s

5

5

Rated short-time withstand current duration(earthing switch)

s

2

2

Rated breaking transfer current/ take-over current

A

3150

Short-circuit breaking current(vacuum interrupter)

kA

10

10

10

Rated lighting impulse withstand voltage

phase-to-phase, phase-to-earth

kV

75

75

75

between contacts

kV

85

85

85

vacuum interrupter

kV

75

75

75

Rated short-time frequency withstand voltage(1min)

phase-to-phase, phase-to-earth

kV

42

42

42

between contacts

kV

48

48

48

vacuum interrupter

kV

42

42

42

Mechanical life

times

10000

10000

10000

Main circuit resistance

μΩ

180

300

180

Mechanical life for disconnector

times

2000

2000

2000

Mechanical life for earthing switch

times

2000

2000

2000

Use grading for vacuum switch

level

E2

E2

E2

Mechanical life grading for vacuum switch

level

M2

M2

M2

Clearance between open contacts for vacuum switch

mm

10±1

10±1

10±1

Average opening speed for vacuum switch

m/s

0.8

0.8

0.8

Average closing speed for vacuum switch

m/s

0.6

0.6

0.6

Three-phase asynchronous time for closing / opening

ms

2

2

2

Bounce time for contact’s closing

ms

3

3

3

Contacting travel for contacts

mm

4±1

4±1

4±1

Rated contacts pressure

N

1000±200

1000±200

1000±200

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