Live-Tank Outdoor Vacuum Circuit Breaker 3AF0

Description

Minimum maintenance and high operational safety
Our live-tank circuit breakers 3AF0 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 are totally restrike-free and offer reliable operation through their spring stored-energy operating mechanism.

Easy to install, operate and maintain
Due to their modular structure and lightweight components, our live-tank circuit breakers 3AF0 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 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.

Technical Data

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 *1

Closing time

< 50 ms *2

Number of operating cycles

10,000

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
(kV)

Short-circuit
breaking
current (kA)

Lightning
impulse
withstand
voltage (kV)

Operational current (A)

1,250

1,600

2,000

2,500

17.5

25

95

36

25

170

31.5

170

40.5

25

200


Benefits

  • Capacitor and Reactor Switching

  • Up to 40.5 kV and 31.5 kA

  • High operational safety, restrike-free

  • Suitable for all environments

  • SF6 free