10kV 630A Medium Voltage RMU SF6 Load Break Switch – FLN36-12 Indoor LBS
The FLN36-12D/FLRN36-12D is a high-performance SF6 gas-insulated load break switch designed for medium voltage switchgear. Using SF6 gas for superior arc extinguishing and insulation, it provides three reliable working positions: Open, Closed, and Earth.
Key Highlights:
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Versatile Operation: Available in K-type single spring (FLN36) or A-type double spring (FLRN36) mechanisms for different protection needs.
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Compact & Durable: Optimized for space-saving installations in Ring Main Units (RMU), cable distribution boxes, and switching substations.
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Safety First: The FLRN36-12D model supports fuse combinations to provide enhanced control and circuit protection.
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Environmentally Adaptive: Designed for stable performance in diverse environmental conditions with easy installation.
Product Description
The FLN36-12 series is a high-performance Medium Voltage RMU SF6 Load Break Switch designed for incoming lines in electrical distribution systems. Utilizing SF6 gas as the arc-extinguishing and insulating medium, this indoor switch ensures reliable performance within a compact design. It features a three-position rotary movable contact structure, supporting Closing, Opening, and Earthing states with integrated interlock safety.
Features
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Dual Operating Mechanisms: Available as the FLN36-12D (K-type single spring) or FLRN 36-12D (A-type double spring). The A-type model can be equipped with fuse combinations for enhanced circuit protection.
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Superior Insulation: The main circuit is sealed in a rugged epoxy resin housing, ensuring the conductive functions remain unaffected by external environmental influences.
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High Safety Standards: Features an internal structural “weak point” in the housing to safely release overpressure in the event of internal arcing, protecting the cabinet and personnel.
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Maintenance-Free Design: Compact, lightweight, and engineered for long-term operational safety without regular maintenance requirements.
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Wide Application: Specifically optimized for Ring Main Units (RMU), cable distribution boxes, and switching substations.
Specifications
| Item | Unit | FLN36-12D Data |
| Rated Voltage | kV | 12 |
| Rated Current | A | 630 |
| Rated Frequency | Hz | 50 |
| Lightning Impulse Withstand Voltage | kV | 75 |
| Rated Short-time Withstand Current (3s) | kA | 20 |
| Rated Peak Withstand Current | kA | 50 |
| Mechanical Endurance (LBS) | Time | 5000 |
| SF6 Gas Pressure (20°C) | bar | 0.4 |
| Main Circuit Resistance | μΩ | ≤ 65 |
Applications
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Infrastructure: Power supply and switching substations.
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Secondary Distribution: Ring Main Units (RMU) and cable distribution boxes.
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Industrial Use: Protecting and controlling medium voltage electrical equipment.
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