| 摘要 |
<p>For connecting and disconnecting an AC voltage to/from a load (23) via a relay (19) to which an actuator voltage is applied from an actuation circuit, the actuating circuit is connected to a control and measuring circuit (16, 17, 18) which is adapted to control the actuation circuit so that it actuates the relay at an optimum time, said control and measuring circuit (16, 17, 18) being adapted to detect the type of load which is connected to the relay (19). The optimum times of the connection and disconnection sequences of the various types of loads may be determined on the basis of the measurement values of the control and measuring circuit, so that the relay (19) with its contact faces may be controlled very accurately and with least possible wear of the relay itself. The control and measuring circuit (16, 17, 18) can additionally control the relay so that two contact faces of the relay may be kept at a distance which is smaller than the distance between the extreme positions of the contact faces (standby position). The invention thus provides a switch having a relay (19) and a control and measuring circuit (16, 17, 18) which may be produced with very small dimensions, and which is of universal use.</p> |
