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TD556GM Vacuum Interrupter for Vacuum Circuit Breaker
Classification:
Model: TD556GM
Parameter: 40.5KV 2500A 31.5KA
External insulating protection medium
Details Introduction
No. | Technical Data | Unit | Parameter Value |
1 | Rated voltage | kV | 40.5 |
2 | Rated current | A | 2500 |
3 | Rated frequency | Hz | 50/60 |
4 | Rated short-time power frequency withstand voltage (1min) | kV | 95 |
5 | Rated lighting impulse withstand voltage (peak) | kV | 185 |
6 | Rated short-circuit breaking current | kA | 31.5 |
7 | Contact closing force due to bellows and atmosphere | N | 200±50 |
8 | Counterforce at rated contact stroke | N | 290±60 |
9 | Circuit resistance at rated contact force | µΩ | ≤12 |
10 | Rated added external contact final force | N | 3200±200 |
No. | Dimension Data | Unit | Value | ||
1 | Diameter | mm | ¢130±1.5 | ||
2 | Install height | mm | 236±1.5 | ||
3 | External insulating protection medium | -- | SF6,Insulating Oil,Silicon etc. | ||
The 40.5kV Vacuum Interrupter is a core component engineered for medium-voltage power interruption, delivering exceptional reliability and performance in circuit breakers, contactors, and load-breaking switches. Designed for a rated voltage of 40.5kV, this interrupter is capable of handling high continuous currents up to 2500A and possesses a formidable rated short-circuit breaking current of 31.5kA. Its robust dielectric strength is confirmed by a rated power frequency withstand voltage of 95kV for one minute and a lightning impulse withstand voltage of 185kV, ensuring stable operation under severe system overvoltage conditions and contributing to the enhanced safety and stability of the entire electrical distribution network.
At the heart of its superior performance is the advanced vacuum arc-extinction technology. The contacts operate within a high-vacuum envelope, which rapidly extinguishes the arc the moment it forms, ensuring a clean, reliable, and maintenance-free breaking operation. This design results in an extremely low circuit resistance of ≤12 µΩ at the rated contact force, minimizing energy loss due to heating and maximizing operational efficiency. The interrupter features precise mechanical characteristics, including a defined contact closing force and counterforce, ensuring consistent and dependable opening and closing speeds for a long electrical and mechanical life.
With a compact installation height of 236±1.5mm and a diameter of 130±1.5mm, this interrupter is designed for seamless integration into various switchgear assemblies. It is compatible with common external insulating mediums such as SF6 gas, insulating oil, or solid insulation like silicone, offering flexibility for different application environments. In summary, the 40.5kV Vacuum Interrupter stands as a critical, high-performance solution for modern electrical protection systems, providing outstanding breaking capacity, high dielectric strength, and long-term durability for power utilities, industrial plants, and infrastructure projects worldwide.
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