Outdoor distribution · boundary switching
A 12 kV outdoor vacuum boundary circuit breaker for overhead distribution networks. Select the operating mechanism, integral disconnector, controller and CT/PT package to suit the required switching and protection duties.
Confirm the current and breaking-duty combination for the assembly ordered. Common configurations below are 630 A / 20 kA; the available insulation-test report covers a separate 630 A / 25 kA sample.
Select a complete current and breaking-duty pair with the required mechanism. The common configurations below are 630 A / 20 kA; confirm a separate rating schedule for other assemblies.
G identifies the integral-disconnector configuration. Specify the controller, sensing and protection package with the complete model code.
Current and breaking-duty values are separate options. Confirm their matched combination, insulation duty and complete assembly before procurement.
The mechanism values above use AC 220 V. Match the actual motor, opening/closing circuits and controller supply to the order schematic. Confirm the enclosure gas specification and pressure before servicing.
Check altitude, climate, grounding and mounting conditions against the site specification. Conditions outside this envelope require an agreed equipment specification.
The 50 Hz value identifies the named 630 A / 25 kA sample. Confirm frequency for the assembly ordered. The report covers insulation-performance tests; see the report scope and product files.
Choose the mounting layout, mechanism, sensing and control package. Specify the complete assembly and wiring requirements for the equipment ordered.
| Arrangement | Choices | Order check |
|---|---|---|
| Pole support | No mounting bracket is standard. Choose a single-pole or double-pole support if required; single-pole is usual when a support is fitted. | Specify pole spacing, support hardware and operating access on the installation drawing. |
| Integral disconnector | Standard: without. Specify the isolator-equipped G arrangement when required. | Confirm the complete model code, switching sequence and interlocks against the assembly schematic. |
| Outlet and insulating covers | Bushing outlets are standard. Inlet/outlet covers and isolator covers are optional; no covers is the standard selection. | Match cable landings, cover set and electrical clearances to the approved installation drawing. |
ZW20Z-12/630-20 identifies an intelligent configuration. Specify the complete designation and controller, protection functions, CT connections and approved terminal schedule. Confirm installation guidance and software commissioning requirements with the order. Default choices apply to the selected control package.
Compare the breaker outline and suspended double-pole arrangement. Check the complete assembly against the project layout before specifying supports, electrical clearances and control connections.
Use the manual and selection form to specify the complete assembly. The report identifies the tested sample and test category.
PDF · 20 pages
Ratings, service conditions, operation, outline dimensions and pole installation. Match the selected assembly and controller before installation.
DOC · 63 KB
Specify the model, mechanism, housing, mounting, CT/PT arrangement and control package. Confirm optional functions and commissioning scope with the order.
PDF · 24 pages · 2023
Report SL2023/0793-01, dated 26 September 2023, records the insulation test category for one ZW20-12/630-25 sample, with auxiliary-circuit insulation, power-frequency withstand, lightning impulse, sealing and circuit-resistance results listed. Match this 630 A / 25 kA sample separately from a 20 kA configuration; it does not establish 25 kA interruption performance.
See Liqiang manufacturing and inspection activities. Model reports and factory inspection records serve different purposes; match the required documents to the proposed equipment.
Configuration · ZW20-12/630-20
Liqiang reference quotation for a 12 kV, 630 A, 20 kA motor-operated breaker with a basic controller and single-phase operating PT. Selected PT/CT details and control functions must be confirmed.
Liqiang reference price
USD 1600–2400 / set
USD per complete three-phase set. Final pricing is subject to the actual configuration, order quantity and written quotation from Liqiang. Shipping, taxes, installation, communications, battery, mounting brackets and optional disconnector are excluded.
This reference price range is provided by Liqiang for initial project enquiries. Request a written quotation to confirm the selected configuration and supply scope.
Answers about model selection, insulation, controls, pole mounting and the available test report.
State the full designation, rated current, short-circuit duty, operating method and isolator requirement. Common 630 A / 20 kA assemblies are available in manual and electric arrangements, with or without an isolator. Confirm the complete control package with the order. See the model codes and ratings.
Vacuum interrupters switch the current. An SF6/N2 mixed gas provides insulation inside the sealed tank. These functions are separate; specify the complete breaker assembly and its operating conditions. See the electrical ratings and service conditions.
Specify the operating mechanism and controller supply, CT quantity and connected ratio, PT arrangement, zero-sequence sensing, communications and backup battery. Match the selected package to its approved schematic and terminal schedule. See the configuration requirements.
Use the illustrated assembly to compare the envelope and mounting arrangement. Confirm brackets, pole spacing, clearances, cable routing and controller position against the approved drawing for the selected assembly before installation. See the outline and pole installation drawings.
Motor operation provides powered actuation of the breaker mechanism. A feeder-protection package also combines sensing, a controller, trip logic and the associated control wiring; automatic reclosing and communications depend on the selected package. Describe the required functions when specifying the ZW20 control and sensing arrangement.
State the system frequency, altitude, ambient-temperature range and outdoor exposure, including pollution or corrosive conditions. Add the pole or support layout, connection directions and available operating supply. Compare these inputs with the service conditions to select the complete breaker, controller and mounting arrangement.
