How Does an Automotive Thermostat Switch Work?
1 Answers
The thermostat switch contains a bimetallic strip inside, which has different thermal expansion coefficients. When the temperature reaches a certain critical point, the strip deforms to connect the contacts, allowing current to flow. Below this temperature range, the circuit is disconnected. Here is some extended information about thermostat switches: 1. Operating range: The operating range of an automotive thermostat switch is 85~105°C. 2. Composition: It consists of a wax-type temperature-sensitive driving element and a two-stage contact action mechanism. The switch utilizes the sudden volume expansion of paraffin when it changes from solid to liquid upon heating to move the push rod, thereby controlling the opening and closing of the contacts. As the coolant temperature rises, the paraffin expands, pushing the push rod through a rubber sealing membrane to overcome the tension of the spring frame.