Indoor Vacuum Circuit Breaker
General Information
- Description
Cricuit-breakers must make and break all currents withing the scope of their ratings, from small inductive and capacitive load currents up to the short-circuit current, and this under all fault conditions in the power supply system such as earth faults, phase opposition and so on.
Further information you find in the booklet Vacuum Switching Technology and Components for Medium Voltage - Your guide on the right hand side.
Our Portfolio (6)
Vacuum Circuit-Breaker 3AH4
For frequent-operation application
- Description
- Technical Data
- Dimensions
Certain applications, especially in the industry, need high and up to very high numbers of operating cycles. For example, operation of arc furnaces requires more than 100 operating cycles a day.
The vacuum circuit-breaker type 3AH4 up to 36 kV is designed for extremely high numbers of operating cycles: It controls 60,000 / 120,000 operating cycles.
Minimum maintenance work, such as greasing of operating mechanisms after 10,000 operating cycles and replacement of vacuum interrupters after 30,000 operating cycles, preserves the reliability of these circuit-breakers throughout their entire service life – despite high mechanical stress.
| Rated voltage (kV) | short-circuit breaking current (kA) | Rated normal current (A) | ||||
| 1250 | 2000 | 2500 | 3150 | 4000 | ||
| 12 | 31,5 | □ | □ | |||
| 40 | □ | □ | □ | □ | ||
| 15 | 31,5 | □ | □ | |||
| 40 | □ | □ | □ | |||
| 24 | 25 | □ | □ | |||
| 40 | ■ | |||||
| 36 | 31,5 | ■ | ■ | ■ | ■ | ■ |
| 40 | ■ | ■ | ■ | |||
□ Available design 30,000/ 60,000 operating cycles
■ Available design 120,000 operating cycles
Sample 1: Type 3AH4165-4
| Rated voltage | Normal current | Short-circuit breaking current |
| 15 kV | 2000 A | 31,5 kA |
Sample 2: Type 3AH4254-2
| Rated voltage | Normal current | Short-circuit breaking current |
| 24 kV | 1250 A | 25 kA |
Sample 3: 3AH4306-8
| Rated voltage | Normal current | Short-circuit breaking current |
| 36 kV | 4000 A | 40 kA |
Please find additional dimension drawings and data in our catalogue.
Download - Catalogue
Vacuum Circuit-Breaker 3AH4