TRANSFORMERS & ELECTRICAL COMPONENTS
APPLICATION / 01
Indoor switchgear circuits
For incoming, outgoing and other defined switching duties in compatible medium-voltage assemblies.
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Product illustration. Actual configuration varies by specification.
Open product image ↗Circuit Breakers
VS1-12 · Indoor vacuum circuit breaker
Indoor vacuum circuit breaker for medium-voltage protection and switching duties.
- Voltage designation
- 12 kV
- Selection
- Rated current and breaking capacity
- Thermal withstand duration
- 4 s
- Mechanical life stated
- 20,000 operations
Price on enquiry · Configuration, quantity & destination
Supply scope, manufacturer information, applicable documents and warranty arrangements are confirmed in the quotation and order.
APPLICATION & DUTY
Where VS1-12 fits
VS1 is an indoor medium-voltage vacuum circuit breaker for switching and protection duties. The operating mechanism and breaker body form an integrated arrangement, with fixed and withdrawable installations described. Selection must match both the electrical duty and the switchgear interfaces.
APPLICATION / 02
Replacement and maintenance
For replacement enquiries where the existing breaker dimensions, operating supply and secondary connections can be checked.
PRODUCT ENGINEERING
Construction & operating functions
DETAIL / 01
Vacuum interruption
The breaker uses vacuum interruption for the selected switching duty. Rated current and short-circuit duties must be checked against the specific configuration.
DETAIL / 02
Integrated operating mechanism
The mechanism and breaker body are arranged as one assembly. Operating supply and auxiliary functions are selected with the control scheme.
DETAIL / 03
Fixed or withdrawable arrangement
Installation may be fixed or use a withdrawable truck arrangement. These require different mounting and connection interfaces.
DETAIL / 04
Operating duty
Frequent operation must remain within the selected breaker’s rated duty. Application and expected operating frequency should be included in the enquiry.
DEFINE THE SELECTED ASSEMBLY
Configuration & installation interfaces
Match the installation drawing, cable routes, clearances and electrical duty for the selected equipment.
Illustrative working scene- Electrical ratings
- State voltage, current and required breaking and withstand duties.
- Installation
- Specify fixed or withdrawable assembly and the switchgear reference.
- Secondary functions
- Provide trip/close voltage, auxiliary contacts and interlock requirements.
Installation & connection checklist
- Supply pole spacing and terminal drawings.
- For a truck-mounted replacement, provide truck and secondary-plug details.
- Identify existing mechanical and electrical interlocks.
- Agree the exact variant before confirming replacement compatibility.
RATING DATA
Technical parameters
8Parameter / configuration entries
Units shownCompare values with their units
Selected variantConfirm the matching configuration
Review the listed configuration and applicable units. On a small screen, scroll the table sideways.
| Parameter | Catalogue value |
|---|---|
| Rated voltage | 12 kV |
| Frequency stated in overview | 50 Hz |
| Lightning impulse withstand | 75 kV |
| 1 min power-frequency withstand | 42 kV |
| Short-circuit breaking current options | 20 / 25 / 31.5 / 40 kA |
| Thermal withstand duration | 4 s |
| Secondary-circuit 1 min withstand | 2,000 V |
| Mechanical life stated in catalogue | 20,000 operations |
Checked against original distribution catalogue PDF page 49. Rated current and switching-duty combinations depend on the selected breaker variant. Ratings describe catalogue options, not every possible combination; select the complete configuration in the technical schedule.
Drawings & configuration documents
Send your selected rating and installation requirements to request the matching dimensional drawing, connection details and technical schedule.
DOCUMENTS · DELIVERY · SUPPORT
Technical coordination & after-sales enquiries
Confirm the order documents
Agree the selected specifications, applicable drawings, inspection records and identification requirements in the quotation and order.
Coordinate delivery
Include quantity, destination, packing requirements and preferred trade terms. Confirm transport scope and the requested delivery schedule with the quotation.
Request technical support
For an existing unit, provide its model, nameplate or order reference and a description of the issue. Include relevant photos or records already available. Warranty and service scope follow the agreed order terms.
Contact about this model ↗START WITH WHAT YOU HAVE
Prepare a quotation for this equipment.
Choose your enquiry type. Start with the information you have.
Price on enquiry
Quotations are prepared for the selected configuration, quantity and destination. Currency, validity, delivery terms, freight and any applicable duties or taxes are specified in the quotation.
Project procurement
New installations & project tenders
Discuss a project ↗What to prepare
Specify electrical duty, installation arrangement and the required protection coordination.
Distributor procurement
Model lists & repeat orders
Discuss supply requirements ↗What to prepare
List complete breaker variants, pole counts, control voltages and accessory combinations.
Panel & equipment builders
Equipment integration & matching
Discuss an assembly ↗What to prepare
Provide mounting, terminals, operating mechanism and secondary wiring interfaces.
Repair & replacement
Identify an existing unit or part
Identify a replacement ↗What to prepare
Start with the complete nameplate and photos of terminals, mounting, secondary plug and accessories.
Illustrative enquiry scenarios.
Selection checklist for VS1-12
- Nameplate and exact existing variant when replacing equipment
- Voltage, current, short-circuit duty and protection settings
- Pole spacing, mounting dimensions and terminal arrangement
- Operating/control voltage, trip functions and auxiliary contacts
- Supply pole spacing and terminal drawings.
- For a truck-mounted replacement, provide truck and secondary-plug details.
- Identify existing mechanical and electrical interlocks.
- Agree the exact variant before confirming replacement compatibility.
From enquiry to an agreed supply
- Share the requirementModel, duty, quantity and destination.
- Review the configurationResolve ratings, interfaces and site conditions.
- Agree the technical scheduleScope, drawings, tests, price and delivery terms.
- Confirm delivery documentsAgree packing, identification and the applicable inspection records.
Testing, warranty terms and after-sales scope are to be agreed in the quotation and order documents for the selected configuration.
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Mingkong High & Low Voltage Switchgear Selection Guide · Updated 24 October 2026 · Chinese / English
For a quotation, include your required model, rating, quantity and operating conditions.