12 kV series · Indoor isolation
Three-pole rotary disconnector for indoor 12 kV, 50 Hz systems. Operate at voltage with the circuit unloaded. Select the paired current and withstand ratings, mounting form, earthing option and operating interfaces to suit the panel.
Operate only with the circuit unloaded. Thermal and dynamic withstand values are paired by current rating; they are not load-breaking or short-circuit interruption ratings.
Choose a complete current and withstand combination, then match the mounting form and site conditions. Operate the disconnector only with the circuit unloaded.
GN30-12 is the standard form; GN30-12D specifies an earthing blade. Thermal and dynamic withstand currents are paired with rated current and do not define load-breaking capability. Confirm the full order designation and selected arrangement.
Agree site conditions outside this envelope before ordering.
Match the upper/lower isolation arrangement, mounting form and operating direction to the panel. Specify earthing and primary contact interfaces together.
| Arrangement | Mechanical and primary fit | Operating interfaces and accessories |
|---|---|---|
| Seat-mounted assembly | Choose upper or lower isolation and match the primary contacts, frame holes and phase spacing to the panel. | Specify the operating direction and the standard GN30-12 or earthing-blade GN30-12D form. |
| Suspension-mounted assembly | Use the defined upper/lower reference view when ordering; hanging the assembly reverses its physical top and bottom. | Confirm contact orientation, operating access and the linkage on the approved order drawing. |
| Side-mounted assembly | No operating panel. Phases are arranged front-to-back rather than horizontally left-to-right. | For a cylindrical shaft, confirm the required hole and slot, mechanism and operating interfaces. |
Three views of the earthing-blade assembly. Confirm its final mounting form, incoming terminals and operating linkage against the approved order drawing.
Earthing-blade view
Oblique view
Rear view
Compare the standard and earthing-blade arrangements. Match the current rating, contact layout and operating direction to the approved order drawing, including dimensions, units, tolerances and cabinet clearances.
The manual, selection form and test report cover installation, order options and the tested sample.
Available · PDF · 2 pages
Ratings, service conditions, model coding and installation drawings for standard and earthing-blade arrangements. Match the current rating and mounting form to the approved order drawing.
Available · DOC · 2019.04
Specify upper/lower isolation, mounting, operating direction, earthing, phase spacing, contact layout, auxiliary contacts, sensors and shaft interfaces. Confirm the earthing-side incoming-line restriction and final dimensions.
Available · PDF · 29 pages
Report 2113345382, dated 6 May 2021, lists six test categories for one GN30-12D/1250-31.5 sample, including power-frequency and impulse insulation, circuit resistance, short-time and peak withstand, 3000-operation mechanical endurance and temperature rise. Match the D arrangement and rated combination; short-time withstand does not establish fault-current interruption.
See Liqiang manufacturing and inspection activities. Model reports and factory inspection records serve different purposes; match the required documents to the proposed equipment.
Configuration · GN30-12/630
Price reference for the specified GN30-12/630 configuration. Standard 630 A rotary disconnector; the D earthing version is quoted separately.
Price range
USD 185–190 / set
USD per complete three-phase set. Minimum order: 1 set. USD 190 per set for 1–19 sets; USD 185 per set for 20+ sets. Shipping and taxes are excluded. Other configurations and accessories require a separate quotation. Confirm the specification and final quotation before ordering.
The range reflects order-quantity tiers for this configuration; it does not cover every option in the series.
| Quantity (sets) | Price per set |
|---|---|
| 1–19 | USD 190 |
| 20+ | USD 185 |
Answers about current ratings, no-load isolation, earthing, installation and ordering requirements.
Both GN30-12 and GN30-12D offer these paired current / 4 s thermal / dynamic withstand ratings: 400 A / 12.5 kA / 31.5 kA; 630 A / 20 kA / 50 kA; 1,000 A / 31.5 kA / 80 kA; and 1,250 A / 31.5 kA / 80 kA. Confirm the complete model designation before ordering. See the rating schedule.
GN30-12D adds earthing blades. Specify the earthing position and whether main and earthing blade movement is linked. The earthing-blade side cannot be the incoming-line side; its contact arrangement cannot be vertical. Confirm these interfaces in the configuration choices.
GN30-12 is an indoor disconnector for energized, no-load circuit switching. Thermal and dynamic withstand values are not load-breaking or short-circuit interruption ratings. Coordinate isolation with the approved switchgear operating procedure.
Choose seat, suspension or side mounting. The upper contact reference is the nameplate and earthing-contact side; suspension reverses physical top and bottom. Right operation also reverses the upper/lower arrangement relative to the usual left operation. Side mounting is supplied without a panel. Confirm phase order and both contact directions on the approved order drawing.
Select the 210, 250 or 275 phase-spacing option and confirm its units, mounting dimensions and tolerances. Parenthesized dimensions in the standard diagram correspond to the 250 spacing arrangement; its technical notes specify 630 A and 20 kA. Confirm the selected current rating, cylindrical or external-hex shaft, lever or mechanism, sleeve and cabinet clearance against the installation drawings.
Provide quantity, the complete model, rated current, mounting arrangement and operating direction. Include the earthing option, phase spacing, contact layout, shaft interfaces, sensors and auxiliary contacts. Use the manual and selection form with your cabinet drawing to specify the assembly.
