| 摘要 |
PCT No. PCT/DE95/01089 Sec. 371 Date May 13, 1997 Sec. 102(e) Date May 13, 1997 PCT Filed Aug. 17, 1996 PCT Pub. No. WO96/07192 PCT Pub. Date Mar. 7, 1996Switching devices can have means for contactless switching position detection. According to the invention, magnetic field sensors arranged at suitable locations inside and/or outside a device housing are provided for switching position detection. In particular, position-dependent magnetic fields are measured for ON/OFF position detection, overcurrent triggering, and contact welding; however, the magnetic field of the current flowing is detected to recognize short-circuit triggering. Differential Hall effect sensors and Reed contacts, respectively, can be used for these purposes. In addition, a sound sensor can be provided for detecting the switching noise, whose signal is evaluated together with the overcurrent triggering signal for short-circuit detection.
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