Method to detect a contact isolation layer in a switching element having contacts and a switch having such a switching element

摘要

The method involves connecting logic element (1) with a switching voltage (US) at the input side and with an electrical load (4) at the output side. An expected turn on time of the logic element is measured over the closed logic element lying close to contact voltage (UC) for multiple switching cycles. An alarm (MSG1) is issued, if a currently measured value of the contact voltage exceeds a given lower minimum voltage value. An independent claim is also included for a switching device, which has an input connection for connecting a switching voltage.