TRANSFORMERS & ELECTRICAL COMPONENTS
APPLICATION / 01
Outdoor distribution feeders
For urban, rural and industrial overhead distribution duties.
MINGKONGmkelecsolution.com
Product illustration. Actual configuration varies by specification.
Open product image ↗Circuit Breakers
ZW20-12F · Outdoor vacuum circuit breaker
Outdoor vacuum circuit breaker with a sealed enclosure for distribution automation.
- Voltage designation
- 12 kV
- Selection
- Rated current and breaking capacity
- Rated current options
- 630 / 1,000 / 1,250 A
- Frequency
- 50 Hz
- Breaking current options
- 20 / 25 kA
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 ZW20-12F fits
ZW20 is an outdoor vacuum circuit breaker with a sealed enclosure arrangement using SF6 insulation. Vacuum interruption and enclosure insulation perform different functions in this design. The selected mechanism, controller and protection arrangement determine the complete operating scope.
APPLICATION / 02
Automated switching points
For installations requiring controller-based protection and, where specified, reclosing or remote monitoring.
PRODUCT ENGINEERING
Construction & operating functions
DETAIL / 01
Vacuum interruption with gas insulation
The current-interruption function uses vacuum interrupters; the sealed enclosure uses SF6 for insulation. These functions should be identified correctly in the equipment specification.
DETAIL / 02
Sealed outdoor arrangement
The enclosure and connection arrangement are selected for the outdoor installation. Site conditions and required environmental performance should be stated.
DETAIL / 03
Spring operating mechanism
The described design uses a spring operating mechanism. Operating supply and secondary functions must match the installation control scheme.
DETAIL / 04
Configured automation
Protection, communication and reclosing functions require the selected controller and settings. They are not implied by the breaker designation alone.
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 duty
- Provide system voltage, current and required fault duties.
- Control scheme
- Identify trip/close supply, protection functions and automation sequence.
- Installation
- Specify mounting, terminals and outdoor site conditions.
Installation & connection checklist
- Provide the network single-line diagram and protection coordination requirements.
- Identify controller, communication and auxiliary-supply scope.
- Confirm mounting and conductor-interface drawings.
- Agree inspection and operating-document requirements for the selected assembly.
Operating conditions for the listed configuration
- Altitude up to 3,000 m; ambient −40 to +40 °C.
- Catalogue daily temperature variation: 25 °C; wind speed up to 35 m/s.
- No explosive atmosphere, severe chemical corrosion or severe vibration.
State any different ambient temperature, altitude, humidity, dust, salt or corrosive exposure when requesting the installation-specific configuration.
RATING DATA
Technical parameters
12Parameter / 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 |
| Rated frequency | 50 Hz |
| Rated current options | 630 / 1,000 / 1,250 A |
| Short-circuit breaking current options | 20 / 25 kA |
| Peak withstand/making current options | 50 / 63 kA |
| Short-time withstand (4 s) options | 20 / 25 kA |
| Mechanical life stated in catalogue | 10,000 operations |
| Rated-current breaking operations stated | 10,000 operations |
| 1 min withstand, phase/earth and open gap | 42 / 48 kV |
| Lightning impulse, phase/earth and open gap | 75 / 85 kV |
| Secondary-circuit 1 min withstand | 2 kV |
| Catalogue net weight | 140 kg; up to 170 kg with isolating arrangement |
Checked against original distribution catalogue PDF page 52. 20 and 25 kA variants correspond to 50 and 63 kA peak ratings. 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 ZW20-12F
- 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
- Provide the network single-line diagram and protection coordination requirements.
- Identify controller, communication and auxiliary-supply scope.
- Confirm mounting and conductor-interface drawings.
- Agree inspection and operating-document requirements for the selected assembly.
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.