Under rated conditions, the higher switched load destroys contamination, but there is an influence from the micro-climate on the electrical life. Therefore, an additional test with small loads is necessary for the selection of materials. As the ambient temperature increases, so does the coil resistance. High-temperature relays, therefore, have to be more sensitive when compared to relays for normal ambient conditions. In addition, higher temperatures and an applied load current change the mechanical properties of the contacts.
Stiffness is reduced and the pull-in behavior is smoother.
The bold line in Fig. Due to the changes in environmental conditions and changes of the dynamic behavior in the relay, inevitably, a change of the electrical performance occurs. Summary With the properties of materials currently available, the production of high temperature relays can be easily achieved. Nevertheless, it is necessary to master relay physics and production technology and have a technical knowledge of the materials employed. The challenge today is the optimization of costs and processes in a manner that enables the relay manufacturer to offer a reliable product with excellent performance, in a small as possible package, with low power consumption, and the ability to bring it to the market at a realistic price.