Thermal circuit breakers will trip at high amerage in a cold environment, and it will trip at a lower amperage in Thermal circuit breakers will trip at higher amperage in a cold environment, and it will trip at a lower amperage in a hot environment. For example, motor windings need more protection from overheating at 90°C than the same windings at 20°C. A cold motor requires  more in-rush current to get started, and therefore a longer delay is advantageous on a cold day. Another misconception is that magnetic-hydraulic style circuit breakers are immune to performance changes in rising ambient temperatures. On the contrary, these circuit breakers contain a dashpot with a liquid core that becomes more fluid at higher temperatures – in turn reducing the time of the hydraulic delay.