Medium Voltage Outdoor Devices
General Information
- Description
Outdoor vacuum circuit-breakers are especially designed for outdoor installation. The design comprises a minimum of moving parts and a simple construction, which guarantees a long electrical and mechanical endurance, offering the same advantages as indoor vacuum circuitbreakers.
Further information you find in the booklet Vacuum Switching Technology and Components for Medium Voltage - Your guide on the right side.
Our Portfolio (3)
3AF0 and 3AG0 LT Outdoor Vacuum Circuit Breaker
- Description
- Technical data and ratings
Minimum maintenance and high operational safety
Our live-tank circuit breakers 3AF0 and 3AG0 excel in their ability to reliably switch off overhead lines. The special technical features of live-tank design are, that the interrupter chamber is situated in the weatherproof porcelain or composite material insulator and is at high potential (or: live). With live-tank designs, the voltage level determines the length of the insulators for the interrupter chamber and the insulator column. Our live-tank circuit breakers 3AF0 and 3AG0 are totally restrike-free and offer reliable operation through their spring stored-energy operating mechanism.
Your advantages:
- Capacitor and Reactor Switching
- Up to 40.5 kV and 31.5 kA
- High operational safety, restrike-free
- Suitable for all environments
- SF6 free
Easy to install, operate and maintain
Due to their modular structure and lightweight components, our live-tank circuit breakers 3AF0 and 3AG0 can easily be transported to their installation site. Their switching function is based on the same, well-proven components we use for our indoor circuit breakers. In addition, they can be optimally adapted to each application using current and voltage transformers. And since they contain very few moving parts, our live-tank circuit breakers 3AF0 and 3AG0 are virtually maintenance-free.
Optimized reliability and operational safety
The sealed pole design makes them suitable for all environments. In addition, all live-tank circuit breakers up to 40.5 kV conform to the new IEC 62271-100 (the new standard for circuit breakers) and all models have been type-tested at the independent KEMA laboratory in the Netherlands.
| Rated operating current | 1,250 A to 2,500 A |
| Rated voltage | 12 kV to 40.5 kV |
| Short-circuit breaking current | 20 kA to 31.5 kA |
| Lightning impulse withstand voltage | 75 kV to 200 kV |
| Operating sequence | O – 0.3s – CO – 3m – CO; O – 0.3s – CO – 15s – CO |
| Opening time | < 75 ms |
| Closing time | < 50 ms *1 |
| Number of operating cycles | 10,000 *2 |
| Number of short circuit operations | up to 100 |
| Standards | IEC 62271-100, IEC 60694 (in future IEC 62271-1) |
*1 with 2nd shunt release
*2 higher switching cycle rates on request
| Rated voltage | Short-circuit breaking current | Lightning impulse withstand voltage | Operational current 1,250 A | Operational current 1,600 A | Operational current 2,000 A | Operational current 2,500 A |
| 17.5 kV | 25 kA | 95 kV | • | • | ||
| 36 kV | 25 kA | 170 kV | • | • | ||
| 31.5 kA | 170 kV | • | • | |||
| 40.5 kV | 25 kA | 200 kV | • |