ZN139-12 Series

High-Voltage Vacuum

Circuit Breaker

（630-4000A）

Concise Efficient Safe Comprehensive

PRODUCT OVERVIEW

High-voltage circuit breakers are very critical equipment in the power system, mainly used for controlling and protecting the power grid. They are capable of withstanding voltage levels up to kV, thus playing a vital role in the transmission and distribution process. They are suitable for controlling and protecting the grid with AC 50Hz, rated voltage of 12kV, and rated operating current of 630A to 4000A. It's widely used in used in industrial and mining enterprises, substations and other places, especially suitable for frequent operation.

Product characteristics

Enhance customer productivity

Ensure safety of personnel and assets

Optimize investment costs of whole life cycle

Embedded pole

ZN139 series vacuum circuit breaker adopts advanced casting embedded pole, and its special structure ensures that the vacuum arc-extinguishing chamber is reliably protected from mechanical impact, dust and moisture.

Making and breaking current in vacuum
  • Vacuum circuit breakers do not require an arc-extinguishing and insulating medium. In fact, there are no substances in the chamber that can be ionized.
  • In any case, when the contacts are separated, the arc channel between the contacts is only made of the metallic vapors of the contact material.
  • When the main circuit current naturally disappears at zero crossing, the arc cannot be held. At the time, the rapidly decreasing carrier density and the rapidly condensing vacuum metal vapor quickly recover the insulation between the contacts.
  • Thus, the vacuum arc-extinguishing chamber recovers insulation and restores the capability to withstand the transient recovery voltage of the system, and eventually extinguishes the arc.

Vacuum arc-extinguishing chamber

The cup-shaped longitudinal magnetic contatcs are made of high-quality material and have low chopping current value; use the one-time tube sealing and exhausting technique, with high dielectric recovery strength and low air leakage rate; high mechanical strength, long mechanical life; strong making and breaking insulation recovery greatly reduces the reignition and TRV breakdown.

Product structure

Structural characteristics

Technical parameters

ZN139-12/D Permanent magnetic vacuum circuit breaker technical parameters

No. Name Unit Parameters
1 Rated voltage kV 12
2 Rated frequency withstand voltage phase-to-phase, phase-to-ground/contacts (1min) kV 42/48
3 Rated lightning impulse voltage phase-to-phase, phase-to-ground/contacts (peak) kV 75/85
4 Rated frequency Hz 50
5 Rated current A 630-2500 630-3150* 630-4000*
6 Rated short-circuit breaking current kA 20   25 31.5 40
7 Rated short-circuit making current kA 50   63 80 100
8 Rated peak withstand current kA 50   63 80 100
9 Rated thermal stability current (RMS) kA 20   25 31.5 40
10 Rated short-circuit duration s 4
11 Number of times of rated short-circuit breaking current Number of times 30 30 30
12 Mechanical life 40000
13 Classification: Mechanical life/Electrical life/Capacitive current breaking M2/E2/C2
14 Mechanical life of permanent magnet mechanism - 120000 120000 120000
15 Rated single/back-to-back capacitor bank breaking current A 630/400(40kA为800/400）
16 Phase spacing mm 210 275
17 Clearance between open contacts(1) mm 9±1
18 Contact overtravel mm 3±1
19 Allowable wear accumulative thickness of dynamic and static contacts mm 3
20 Three-phase opening and closing non-simultaneity ms ≤2

Note: *3150A and above require forced air-cooling

ZN139-12/G Permanent magnetic vacuum Circuit Breaker Technical Parameters

No. Name Unit Parameters
1 Rated voltage kV 12
2 Rated frequency withstand voltage phase-to-phase, phase-to-ground/contacts (1min) kV 42/48
3 Rated lightning impulse voltage phase-to-phase, phase-to-ground/contacts (peak) kV 75/85
4 Rated frequency Hz 50
5 Rated current A 630-2500 630-3150* 630-4000*
6 Rated short-circuit breaking current kA 20   25 31.5 40
7 Rated short-circuit making current kA 50   63 80 100
8 Rated peak withstand current kA 50   63 80 100
9 Rated thermal stability current (RMS) kA 20   25 31.5 40
10 Rated short-circuit duration s 4
11 Number of times of rated short-circuit breaking current Number of times 30 30 30
12 Mechanical life Number of times 30000
13 Rated single/back-to-back capacitor bank breaking current A 630/400(40kA为800/400）
14 Phase spacing mm 150 210 275
15 Clearance between open contacts(1) mm 9±1
16 Contact overtravel mm 3±1
17 Allowable wear accumulative thickness of dynamic and static contacts mm 3
18 Three-phase opening and closing non-simultaneity mm ≤2
19 Opening time ms ≤50
20 Closing time ms ≤70
21 Rated operating sequence - 0.3s    180s          180s    180s
O —— CO—— CO          O —— CO—— CO

Note: *3150A and above require forced air-cooling

Selection table

ZN139-12 Series High-voltage Vacuum Circuit Breaker

ZN139 12 GD 630 25 Handcart type P H Anti-trip relay
Product code Voltage level Product function Rated current Breaking current Installation method Phase spacing (P) Pole spacing (H) Accessories
ZN139：
Vacuum Circuit Breaker		 12kV G: Spring embedded insulation
GD: Permanent magnet embedded insulation
D: Permanent magnet composite insulation
T: Spring composite insulation		 630A
1250A
1600A
2000A
2500A
3150A
4000A 		20kA
25kA
31.5kA
40kA		 Handcart type
Fixed front mounted
Fixed side mounted		 150mm
210mm
275mm		 275mm
310mm		 Anti-trip relay
Cut-off capacitor bank
Undervoltage tripping device
Door interlock
Chassis extended swing handle/85mm
Electric chassis + controller
Chassis program lock
Program lock

Technical Parameters


  • 1. Rated voltage（kV）：12

    2. Rated frequency withstand voltage phase-to-phase, phase-to-ground/contacts (1min)（kV）：42/48

    3. Rated lightning impulse voltage phase-to-phase, phase-to-ground/contacts (peak)（kV）：75/85

    4. Rated frequency（Hz）：50

    5. Rated current（A）：630-2500/630-3150*/630-4000*

    6. Rated short-circuit breaking current（kA）：20   25/31.5/40

    7. Rated short-circuit making current（kA）：50  63/80/100

    8. Rated peak withstand current（kA）：50  63/80/100

    9. Rated thermal stability current (RMS)（kA）：20  25/31.5/40

    10. Rated short-circuit duration（s）：4

    11. Number of times of rated short-circuit breaking current（Number of times）：30/30/30

    12. Mechanical life（Times）：40000

    13. Classification: Mechanical life/Electrical life/Capacitive current breaking：M2/E2/C2

    14. Mechanical life of permanent magnet mechanism:120000/120000/120000

    15. Rated single/back-to-back capacitor bank breaking current（A）：630/400(40kA为800/400）

    16. Phase spacing（mm）：210  275

    17. Clearance between open contacts(1)（mm）：9±1

    18. Contact overtravel（mm）：3±1

    19. Allowable wear accumulative thickness of dynamic and static contacts（mm）：3

    20. Three-phase opening and closing non-simultaneity（ms）：≤2

  • 1. Rated voltage（kV）：12

    2. Rated frequency withstand voltage phase-to-phase, phase-to-ground/contacts(1min)（kV）：42/48

    3. Rated lightning impulse voltage phase-to-phase, phase-to-ground/contacts (peak)（kV）：75/85

    4. Rated frequency（Hz）：50

    5. Rated current（A）：630-2500/630-3150*/630-4000*

    6. Rated short-circuit breaking current（kA）：20   25/31.5/40

    7. Rated short-circuit making current（kA）：50  63/80/100

    8. Rated peak withstand current（kA）：50  63/80/100

    9. Rated thermal stability current (RMS)（kA）：20  25/31.5/40

    10. Rated short-circuit duration（s）：4

    11. Number of times of rated short-circuit breaking current（Number of times）：30/30/30

    12. Mechanical life（Times）：30000

    13. Rated single/back-to-back capacitor bank breaking current(A)：630/400(40kA 800/400）

    14. Phase spacing（mm）：150  210  275

    15. Clearance between open contacts(1)（mm）：9±1

    16. Contact overtravel（mm）：3±1

    17. Allowable wear accumulative thickness of dynamic and static contacts（mm）：3

    18. Three-phase opening and closing non-simultaneity（mm）：≤2

    19. Opening time（ms）：≤50

    20. Closing time（ms）：≤70

    21. Rated operating sequence：0.3s 180s O —— CO—— CO / 180s  180s O —— CO—— CO

Selection table


  • Product code：ZN139：Vacuum Circuit Breaker

    Voltage level：12kV

    Product function：GG: Spring embedded insulation /GD: Permanent magnet embedded insulation /D: Permanent magnet composite insulation /T: Spring composite insulation

    Rated current：630A/1250A/1600A/2000A/2500A/3150A /4000A

    Breaking current：20kA/25kA/31.5kA/40kA

    Installation method：Handcart type/Fixed front mounted/Fixed side mounted

    Phase spacing (P)：150mm/210mm/275mm

    Pole spacing (H) ：275mm/310mm

    Accessories：Anti-trip relay /Cut-off capacitor bank /Undervoltage tripping device /Door interlock /Chassis extended swing handle/85mm/Electric chassis + controller/Chassis program lockProgram lock