YFN12-12 / YFN12-12RD

The YFN12 (FN12)-12 series indoor AC high-voltage load switch employs a pressurized arc-extinguishing principle. Thanks to its unique structural design, it efficiently utilizes the compressed air generated during the switch's opening operation to swiftly quench the arc. Its performance fully meets the requirements outlined in the national standards GB 3804-2004 "High-Voltage AC Load Switches Rated from 3.6 kV to 40.5 kV" and GB 16926-2009 "High-Voltage AC Load Switch-Fuse Combination Apparatus." This switch is ideally suited for use in AC high-voltage networks operating at 12 kV and 50 Hz, where it can reliably handle load currents, overload currents, and make-and-break short-circuit currents. When combined with high-voltage current-limiting fuses and a trip unit, it forms the YFN12-12R series indoor AC high-voltage load switch-fuse combination apparatus, capable of reliably interrupting rated short-circuit currents.

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Product Description

Product Overview

The YFN12 (FN12)-12 series indoor AC high-voltage load switch employs a pressurized arc-extinguishing principle. Thanks to its unique structural design, it efficiently utilizes the compressed air generated during the switch's opening operation to swiftly quench the arc. Its performance fully meets the requirements outlined in GB 3804-2004, "High-Voltage AC Load Switches Rated from 3.6 kV to 40.5 kV," and GB 16926-2009, "High-Voltage AC Load Switch-Fuse Combination Apparatus"—both national standards. This switch is ideally suited for use in AC high-voltage networks operating at 12 kV and 50 Hz, where it can reliably handle switching operations involving load currents, overload currents, and short-circuit make-and-break duties. When combined with high-voltage current-limiting fuses and appropriate trip units, it forms the YFN12-12R series of indoor AC high-voltage load switch-fuse combination apparatus, capable of reliably interrupting rated short-circuit currents under fault conditions.

Model Description

Environmental operating conditions

1. Altitude ≤ 1000 m;
2. Ambient temperature range: -25°C to +40°C;
3. The daily average relative humidity should not exceed 95%, and the monthly average should not be higher than 90%;
4. The surrounding air is not noticeably contaminated by dust, smoke, corrosive and/or flammable gases, vapors, or salt spray;
5. Areas free from fire and explosion hazards;
6. Locations with seismic intensity not exceeding 8 degrees and slope angles no greater than 5°.
Note: The above outlines the standard operating conditions according to GB/T 11022. For special application environments such as high altitudes, heavy salt spray, or extremely cold/heat conditions, the technical design can be modified and customized based on these requirements.

Main technical specifications

Structural Features

The versatile installation options of this load switch meet a wide range of customer requirements.
A. Installation Method — Top-entry wiring for upright mounting, bottom-entry wiring for inverted mounting
B. Operation Method – Side-Panel Control

Switch shape

Load switch electrical