Indoor switching · load break switch
An indoor 12 kV AC air-blast load break switch for medium-voltage distribution equipment. The ratings below are for FKN12-12D/630-20. Confirm the grounding-switch option, operating method, mounting direction, operating side and supply for your order.
For FKN12-12D/630-20, 20 kA is the rated short-time withstand current. It is not a short-circuit breaking rating.
Complete product ratings
These ratings apply to the bare FKN12-12D/630-20 load switch. Other FKN12 order codes may differ; FKRN load-switch/fuse combination ratings are separate.
For FKN12-12D/630-20, 20 kA is the rated short-time withstand current; it is not a short-circuit breaking rating. The FKN12-12/630-20 code omits the grounding-switch suffix. The ratings above apply to FKN12-12D/630-20.
Normal and inverted installation are available. Match the cabinet dimensions, operating direction and secondary circuits to the approved drawings.
| Arrangement | Mechanical and primary fit | Control and interlocks |
|---|---|---|
| Normal installation | Side-operated. Confirm mounting points, cable entry, clearances and left- or right-hand operating direction against the cabinet drawing. | If a grounding switch is selected, its side must be opposite the incoming-line side. Confirm the interlock arrangement for the selected configuration. |
| Inverted installation | For bottom cable entry, specify inverted installation. Check mounting points and primary clearances against the approved cabinet drawing. | Keep the grounding-switch side opposite the incoming line. Confirm the interlock geometry and control wiring for the order. |
For a 900 mm cabinet depth, the listed defaults are 194 mm from the panel to the mounting hole and 494 mm from the panel to the B-phase center. Confirm dimensions against the approved order drawing; other dimensions may be specified.
Bare-switch codes: FKN12-12/630-20 or FKN12-12D/630-20. The D suffix identifies the grounding-switch option; the detailed ratings on this page apply to FKN12-12D/630-20.
Product type: FKN is the bare load switch; FKRN is the separate load-switch/fuse combination.
Operating side: specify left- or right-hand operation.
Mechanism: manual, electric, or manual closing with electric tripping. Manual closing with electric tripping is available with AC or DC control power.
Supply: select 110 V or 220 V AC or DC. The default is AC 220 V; electric AC and DC versions are not interchangeable.
Other options: specify auxiliary-contact quantity, grounding microswitch, electromagnetic lock, back-to-back interlock, live-voltage indicator or program lock.
| Operating mechanism | Auxiliary contacts fitted | Connected to terminal block | Grounding microswitch |
|---|---|---|---|
| Manual | None | No auxiliary wiring | None |
| Manual closing with electric tripping | 2 NO + 3 NC | 2 NO + 2 NC | None |
| Electric | 4 NO + 5 NC | 2 NO + 2 NC | 1 NO provided; not connected |
NO means normally open; NC means normally closed. Confirm the terminal schedule for the specified configuration.
FKN12 · Layout drawings
Compare the mounting layout for the selected operating side. Dimensions are for reference; confirm clearances and interfaces against the approved order drawing.
These mechanical drawings show the installation layout. A separate CAD file and an FKN12-specific control wiring diagram are not available here. Use the approved project drawings for mounting points, clearances and control connections.
Use the manual and selection form for the selected FKN or FKRN configuration; the test report covers the named FKRN sample.
Available · PDF · 8 pages
Operation, installation, ratings and outline drawings for the FKN load switch and FKRN fuse combination, with separate data for each product type.
Open manual PDFAvailable · DOC
Record the model, mounting direction, operating side, mechanism, supply, cabinet interface, auxiliary contacts and options for your order.
Download selection formAvailable · PDF · 46 pages
Report 2013345856, dated 16 November 2020, lists nine test categories for one 12 kV, 125 A, 31.5 kA FKRN load-switch/fuse combination sample, including combined making/interruption, tripping coordination, fuse vibration and temperature rise. This scope does not cover the standalone FKN12-12D/630-20 load switch.
Open sample reportSee Liqiang manufacturing and inspection activities. Model reports and factory inspection records serve different purposes; match the required documents to the proposed equipment.
Configuration · FKN12-12 630 A
Price reference for the specified FKN12-12 630 A configuration. Base 630 A switch configuration. Fuse combination, earthing arrangement and operating accessories must be confirmed separately.
Price range
USD 275–280 / set
USD per complete three-phase set. Minimum order: 1 set. USD 280 per set for 1–49 sets; USD 275 per set for 50+ 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 |
|---|---|
| 1–49 | USD 280 |
| 50+ | USD 275 |
Answers for choosing the switch, installation arrangement and supporting documents.
FKN identifies the bare load switch. The R in FKRN identifies the separate load-switch/fuse combination. Select current and fault-duty ratings for the exact model; see the FKN12 ratings above.
No. For FKN12-12D/630-20, 20 kA is the rated short-time withstand current. It does not mean the switch has a 20 kA short-circuit breaking capacity. See the ratings above.
Available mechanisms include manual, electric, and manual close/electric trip. Supply options include AC or DC at 110 V or 220 V. Confirm a compatible mechanism and supply in the configuration options.
Select the switch-fuse arrangement when the circuit design calls for load switching together with coordinated fuse protection, such as a transformer feeder. Specify transformer power, system voltage, fault level and the fuse/striker arrangement. Use the complete FKRN12 designation when discussing the switch and fuse configuration.
Provide the cabinet outline, mounting points, terminal positions and operating space. Identify left- or right-hand operation, mechanism position and the earthing arrangement. Compare these interfaces with the installation drawings and use the approved order drawing for cabinet fabrication.
Provide the full FKN/FKRN model code, grounding-switch option, rated duty, mounting direction, operating side, mechanism and supply, cabinet interface, auxiliary-contact count, and required locks or interlocks. Attach cabinet-outline and primary/control drawings when available. The selection form lists the available options.
