YFN7-12

The YFN7 (FN7)-12 series indoor AC high-voltage load switch is a gas-blast arc-extinguishing type high-voltage load switch combined with a fuse, designed for use in 50Hz, 12kV-rated three-phase AC power systems. It is specifically engineered to interrupt load currents and make or break short-circuit currents. The fuse-combined switch can reliably clear short-circuit faults while offering single-phase fuse tripping that results in simultaneous three-phase disconnection—a perfect solution for protecting lines, equipment, and transformers. Its performance fully complies with the standards GB 3804-2004 "High-Voltage AC Load Switches Rated from 3.6kV to 40.5kV" and GB 16926-2009 "High-Voltage AC Load Switch-Fuse Combination Units."

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Product Description

Product Overview

The YFN7 (FN7)-12 series indoor AC high-voltage load switch is a gas-blast arc-extinguishing type high-voltage load switch combined with a fuse, designed for use in 50Hz, 12kV-rated three-phase AC power systems. It is specifically engineered to interrupt normal load currents and make/clear short-circuit currents. The fuse-combined switch unit is capable of handling short-circuit currents and features single-phase fuse operation that triggers a three-phase trip, making it the ideal choice for protecting lines, equipment, and transformers. Its performance complies with GB3804-2004 "High-Voltage AC Load Switches Rated from 3.6kV to 40.5kV" and GB16926-2009 "High-Voltage AC Load Switch-Fuse Combination Units."

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 surpass 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 no greater than 5°.
Note: The above are 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 the above requirements.

Main technical specifications

Structural Features

The multiple installation options for this high-voltage isolator switch meet a variety of customer requirements.
A: Installation Methods — Top-entry wiring (straight installation), bottom-entry wiring (inverted installation), or wall-mounted installation with a wall-mounted operating mechanism.
B: Operation Modes – Side-Panel Operation, Front-Panel Operation

Operating mechanism

Switch shape