The difference between overcurrent protection tablets and temperature controller
1. Protection principle, overcurrent protection tablets (polymer PTC, also known as polymer recovery fuse). It is a metamorphosis polymer PTC thermistor with a conductive polymer material with a positive temperature coefficient characteristics. Made in material materials. This material has a certain conductive ability and can be used through the rated current. If the current of the thermistor is too high, its thermal power is greater than the heat dissipation power. At this time, the temperature of the thermal resistance will Electric Filter Fan Cabinet Heater Fan Heater with Thermostat begin to rise, and the polymer substrate in thermistor resistance will begin to swell, which will separate the charcoal black particles. The resistance rises, which reduces the current in the circuit very effectively. At this time, there is still a small current through the circuit. This current makes the thermistor maintain sufficient temperature to maintain a high resistance state.
Temperature controller (dual metal thermal protection device) is composed of components such as dual metal components such as thermal conductivity and welding silver alloy contacts. When the current has an impedance dual metal element, when the non -normal operation is encountered, when the current increases or the surrounding temperature increases to the set temperature value, the dual metal component is agile, open the contact, and block the interception circuit. When the device cools to the safety of the safety operation, the contacts are automatically closed and the normal operation status is rehabilitated.
2. From the point of view of protection, the overcurrent protective film is because the current passes the PTC component itself to protect the whole machine, so it is more sensitive to the current protection. The dual metal sheet of thermal protector has a temperature sensing function. When the current passes the current, it does not change much, and when the environmental temperature rises sharply, the whole machine can also be protected. Therefore .. Therefore, when many customers are required to be relatively high, dual protection of dual metals and polymer is usually used.
3、从保护原理来看，我们也会发现高分子PTC在保护电路状态并没有完全切断电路，因为高分子PTC受热后，电阻会变得无穷大，但仍然有残余电流存在，在要求较高或者When the circuit is more precise, other components of the circuit will cause damage. The dual -metal thermal protector is completely cut off the circuit during protection without any residual current;
4. From the material point of view, the material of the polymer PTC is organic substance, which is severe in the environment and is often affected by large currents. Perhaps it will make it a long time of maintenance. To the effect of maintenance. The dual metal thermal maintenance device is a metal structure, which is less affected by the external environment, more stable functions, and more reliable. This is why many manufacturers who pay attention to quality selection of dual metal maintenance thermal maintenance device with higher costs are selected.