FN3-10R Load Break Switch | 10kV 400A Indoor Isolator
FN3-10R Load Break Switch is a compact air-insulated switching device designed for 10kV AC medium-voltage distribution systems. With a rated current of 400A, it provides reliable load switching, visible isolation, and grounding for indoor switchgear applications.
Featuring an ON / OFF / EARTH three-position configuration, manual operation, and reliable arc-extinguishing performance, the FN3-10R is suitable for XGN15, GGD, and other metal-enclosed switchgear, as well as industrial feeders, compact substations, transformer protection, and commercial power distribution systems.
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The FN3-10R/400A Indoor Load Break Switch is a compact switching and isolation device designed for 10kV AC medium-voltage distribution systems. With a rated current of 400A, it provides reliable load switching and visible circuit isolation for indoor metal-enclosed switchgear.
Its compact structure makes it suitable for integration into XGN15, GGD, and similar indoor switchgear cabinets. The FN3-10R/400A is widely used for medium-voltage feeder control, transformer protection, and distribution system isolation, offering a practical solution for safe and reliable 10kV power distribution.
Model and Meaning
Technical Data
| Item | Unit | Parameter | |
| Rated Voltage | kV | 10 | |
| Rated Frequency | Hz | 50 | |
| Rated Current | A | 400 | |
| Power Frequency Withstand Voltage | kV | 42 | |
| Lightning Impulse Withstand Voltage | 75 | ||
| Rated Short-Time Withstand Current | kA | 16 | |
| Rated Peak Withstand Current | 40 | ||
| Mechanical Life | Times | ≥2000 | |
| Electrical Endurance | ≥ 100 (load switching) | ||
| Operation Type | / | Manual spring handle | |
| Mounting | Vertical or horizontal cabinet rail | ||
Overall and mounting dimensions(mm)
Key Features
- 10kV / 400A Rated Capacity
Designed for 10kV AC distribution systems with a rated current of 400A. - Air-Insulated Manual Operation
Uses an air-insulated structure with a reliable manual operating mechanism. - Reliable Arc Extinction
Equipped with an arc chute and knife-type contacts for effective load-current interruption. - Three-Position Operation
Provides clear ON / OFF / EARTH positions for switching, isolation, and grounding operations. - Compact Cabinet Integration
Space-saving construction allows convenient installation in indoor metal-enclosed switchgear. - High Electrical and Mechanical Endurance
Designed for reliable performance under repeated switching operations. - Optional Fuse Coordination
Can be combined with suitable fuses to provide enhanced protection for distribution transformers.
Typical Applications
- 10kV Indoor Metal-Enclosed Switchgear – Used for load switching, isolation, and grounding.
- Industrial Power Distribution – Suitable for feeder control and isolation in industrial facilities.
- Compact Substations – Can be used with fuses for transformer protection.
- Commercial Buildings – Suitable for auxiliary and medium-voltage power switching.
- Switchgear Retrofits and Upgrades – Provides a practical air-insulated switching solution for upgrading existing panels.
