I am building a system for measuring some parameters in a climate chamber. The test runs from -55 to +125°C. I need to switch some signals between multiple devices under test using relays. I want to avoid using exotic or expensive parts.
I can find "generic" relays rated from -40 up to +105°C. I will be switching low voltages (below 12 V) and low currents (below 100 mA) most likely with a relay rated for 230 Vac and 16 A. Switching speed is not important.
I know that the plastic can melt, but I wonder what else can happen to a relay when it is used at a higher and lower temperature than specified?