| 摘要 |
The invention relates to a protective device, especially for a residual current circuit breaker. Said protective device is provided with a summation current transformer (2) with a control winding (4) that is subject to a sinusoidal alternating voltage provided by a frequency generator (10). Said frequency generator (10), in its simplest design, comprises a square wave generator (12) and a low-pass filter (14) connected thereto. The inventive protective device provides a simple circuit system that fulfils the requirements of a frequency generator (10) in a residual current protective device. The frequency generator (10) is adapted to the special requirements of a residual current protective device.
|
