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Mingde Electrical (Shanghai) Co., Ltd.

Vacuum Circuit Breaker, Circuit Breaker, Vacuum Interrupter manufacturer / supplier in China, offering 12kv-4000A Vmd Vacuum Circuit Breaker, Zw32 12kv Outdoor Vacuum Circuit Breaker, 550 Modularized Omni-Sealed Solid Insulation Metal-Clad Switchgear and so on.

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Supplier Homepage Product Circuit Breaker 12kv-4000A Vmd Vacuum Circuit Breaker

12kv-4000A Vmd Vacuum Circuit Breaker

Purchase Qty.:
1-99 100+
FOB Unit Price: US $1,560 US $1,180
Purchase Qty. (Pieces) FOB Unit Price
1-99 US $1,560
100+ US $1,180
Get Latest Price
Production Capacity: 22000PCS/Year Circuit Breaker
Transport Package: Wooden Case Packing (900*900*1000mm)
Payment Terms: L/C, T/T, Western Union, Paypal

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Basic Info
  • Model NO.: VMD
  • Operation: Manual and Electric Type Circuit Breaker
  • Arc-extinguishing Medium: Vacuum
  • Structure: Vcb Circuit Breaker
  • Type: Circuit Breaker
  • Certification: ISO9001-2000, CCC, Ohsas 180001
  • Rated Current: 4000A Circuit Breaker
  • Lighting Impulse Withstand Voltage: 75kv Circuit Breaker
  • Rated Short-Time Withstand Current: 20\25\31.5\40 Ka Circuit Breaker
  • Specification: OHSAS/ OHSMS 18001, ISO9001
  • HS Code: 8535210000
  • Breaking Capacity: High and Medium Voltage Circuit Breaker
  • Speed: Normal Type Circuit Breaker
  • Installation: Fixed and Handcart Type Circuit Breaker
  • Poles Number: 3
  • Function: Overcurrent Protection
  • Rated Voltage: 12kv Circuit Breaker
  • 1 Min Power Frequency Withstand Voltage: 42kv Circuit Breaker
  • Rated Frequeny: 50/60Hz Circuit Breaker
  • Trademark: Mingde Circuit Breaker
  • Origin: Cixi, Ningbo Circuit Breaker
Product Description

 12kv-4000A VMD vacuum circuit breaker



1. The complete specification of VMD series vacuum circuit breaker can meet customers' different needs.

2.  VMD adopts the latest embedded poles and low-resistance vacuum interrupter.With main conductive circuit sealed in epoxy resin, the insulation performance will be more stable.


3. VMD employs an accurate gear driving system, instead of the traditional chain wheel driving system. 


4. VMD series circuit breaker passed Type Test Report according to GB and IEC standards.


5. VMD series circuit breaker has exported to 26 countries and regions in the world.


Technical Parameters

NOItem UnitTechnical Data
1Rated voltageKV12
21 min power frequency withstand voltage42
Lighting impulse withstand voltage(peak value)75
3Rated FrequencyHz50
4Rated currentA4000
5Rated short time withstand currentKA40
6Rated withstand current(peak)100
7Rated short-circuit opening current31.5
8 Rated short-circuit closing current 80
9Rated duration of short-circuit S4
10Contact's clearance 3.5±0.5
11Contact's travel 9±1/11±1
12Average opening speedm/s1.1±0.2
13Average closing speed m/s0.6±0.2
14Opening timems35-60
15Closing timems20-45
16Mechanical lifetimes30000
17Rated operating order O-0.3S-CO-180S-CO


External Dimensions

12kv-4000A Vmd Vacuum Circuit Breaker

VMD2-7.2,12pole center distance 150mm


No.Rated Voltage(kV)Rated current(A)Short-circuit breaking current(kA)h1(mm)h2(mm)h(mm)A(mm)B(mm)

12kv-4000A Vmd Vacuum Circuit Breaker
VMD2-7.2, 12,17.5- pole center distance 210mm


No.Rated Voltage(kV)Rated current(A)Short-circuit breaking current(kA)h1(mm)h2(mm)h(mm)A(mm)B(mm)

12kv-4000A Vmd Vacuum Circuit Breaker
VMD2-7.2, 12, 17.5-pole center distance 275mm
No.Rated Voltage(kV)Rated current(A)Short-circuit breaking current(kA)h1(mm)h2(mm)h(mm)A(mm)B(mm)
Normal Operating Environment Condition

a) Normal operating environment condition
Highest temperature:                  +40ºC
Lowest temperature:                   -15ºC
b) Environment humidity
Daily mean relative humidity:        ≤95%
Monthly mean relative humidity:     ≤90%
Daily mean saturated vapor pressure:   ≤2.2×10-3 MPa
Monthly mean saturated vapor pressure:  ≤1.8×10-3 MPa
c) Altitude: below 1000m area;
d) Earthquake intensity: no more than 8 degree;
e) The product shall be away from weep, fire and explosion, chemical corrosion and 
vibration place.

Special Operating Condition

Please consult with manufacturer on manufacturing technology when operating environment is the climatic environment with high altitude, high humidity and great temperature change or other special environment condition.

Packaging, Transportation, and Storage Precaution

(1) Circuit breaker should be in the state of opening and energy storage spring in a state without energy storage when packing. It should be in the state of opening and energy storage spring in a state without energy storage when packing. And it should be fixed on the bottom of the wooden case, should have waterproof measures and complete package labels.
(2) Circuit breakers can't invert and avoid strong vibration, rain, surface damage, and components lost when transportation.
(3) When loading the circuit breaker, we suggest the following tools: crane, forklift and driving. When lifting the circuit breaker, we should not hook on the body or pole of the circuit breaker, but on the lifting hole which has the lifting mark.
(4) When circuit breaker has a long-term storage, it should be in a state of opening and energy storage spring in a state without energy storage and placed in dry ventilated indoor preventing from moisture, vibration control and harmful gas erosion, and regularly checked whether environment meets the requirements.
(5)When first use products after long-term storage, it need to have a power frequency withstand voltage insulation testing.
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