| 摘要 |
<p>The switch unit includes a motor protection switch, an over-current relay, and a protection device, whereby the motor protection switch and/or the over-current relay is associated with a signal contact, with which the switching condition of the motor protection switch and/or the thermic over-current relay is detectable. Signals provided at the signal contacts are evaluated in an evaluation unit (13), so that they can be supplied to a central arrangement. The evaluation unit contains preferably a microprocessor, whose output signals are supplied over a field bus of a central arrangement. The microprocessor controls a switching contact (16), with which the coil of the protection device is controllable.</p> |
