Fast Electric SF6 Load break Switch 12kV 24kV 40.5kV

Product Overview
The 12kV Fast Electric Load Switch is a high-performance, intelligent switching device engineered for 12kV medium-voltage power distribution systems. It integrates advanced SF6 arc-extinguishing technology, fast-operating mechanisms, and built-in sensing components, featuring low power loss, excellent heat dissipation, and strong overload capacity. Designed for global power distribution projects, this switch delivers reliable performance in frequent switching scenarios, with minimal maintenance requirements and enhanced safety protection, fully complying with international IEC standards.Ideal for urban and rural distribution networks, industrial power systems, and smart grid applications, it excels in fast fault handling and accurate power parameter collection, providing a cost-effective and trustworthy solution for overseas purchasers.

Core Advantages 

• High-Purity SF6 Insulation & Fast Arc Extinction: Adopts SF6 gas with purity above 99.9% as insulation and arc-extinguishing medium; arc extinction time ≤10ms (1/2 cycle) with excellent insulation recovery performance. Minimal contact wear at the breaking part eliminates the need for inspection, maintenance or replacement, reducing lifecycle costs.
• Dual Spring Energy Storage Operating Mechanisms: Pre-energy storage mechanism completes opening or closing in ≤0.06 seconds; direct energy storage mechanism completes opening or closing in ≤0.6 seconds. It cooperates perfectly with backup protection devices, ensuring fast and safe fault handling.
• Zero Pressure Reliability: Maintains rated insulation level and breaking capacity even at zero gauge pressure (0 kg・f/㎠ = 0.0 MPa), ensuring operational safety in extreme gas pressure conditions.
• High-Pressure Explosion-Proof Relief Device: Prevents switch cabinet rupture caused by sudden internal gas pressure rise due to abnormalities. The explosion-proof safety diaphragm withstands pressure of 4-6 kg・f/㎠ (0.4-0.6 MPa), protecting personnel and surrounding equipment.
• Dual Locking & Alarm Protection: Equipped with low air pressure locking and alarm device, as well as manual locking device, preventing unsafe operation and ensuring equipment and personnel safety.
• Built-In Sensing Components: Integrates 3 current transformers (CT), 1 set of zero-sequence current transformers (ZCT), and 6 voltage transformers (VT) to accurately collect power distribution network operation parameters, supporting intelligent monitoring and protection.
• Precise Transformer Performance: 3 Current Transformers: Transformation ratio 600/1000:1 (SP ratio optional); 1 set of Zero-Sequence Current Transformers: Transformation ratio 600/1000:1, IA, accuracy class 0.5 (ratio optional).6 Voltage Transformers: 3 on power supply side (A, B, C) and 3 on load side (S, T); phase voltage transformation ratio 0.4-37V (ratio optional), with stable accuracy of 1.0%.
• Comprehensive Sensor Protection: Configured with CT/ZCT protection device to prevent overcurrent and open circuit of current and zero-sequence current sensors; equipped with voltage sensor protection device to prevent overvoltage of phase voltage and zero-sequence voltage sensors.
• Low Loss & Efficient Heat Dissipation: Optimized structural design ensures low power loss and excellent heat dissipation, enhancing overload capacity and extending service life in long-term operation.

Key Technical Specifications

Application Scenarios

With its fast operation, intelligent parameter collection, and comprehensive safety protection, the 12kV Fast Electric Load Switch is widely used in global 12kV medium-voltage power distribution systems, especially suitable for:

• Urban & Rural Power Distribution Networks: Core switching device for 12kV overhead and cable feeder lines, supporting fast fault isolation and power restoration.
• Smart Grid Projects: Built-in CT/ZCT/VT sensors collect real-time operation parameters, supporting remote monitoring and intelligent control, ideal for smart grid automation.
• Industrial Power Systems: Factories, mines, and industrial parks requiring frequent load switching, strong overload capacity, and reliable fault protection.
• Renewable Energy Integration: Solar and wind farm distribution systems, used to switch load currents and cooperate with grid protection devices.
• Critical Infrastructure: Hospitals, data centers, shopping malls, and high-rise buildings, ensuring stable and safe power supply for critical loads.
• Power Grid Retrofits: Cost-effective upgrade for legacy distribution systems, improving switching speed, intelligence level, and safety performance.