bimetal thermostat for refrigerator_mini cooper fuse box factory

24 2024-08

　　The resistance values corresponding to different load currents in PPTC

　　PPTC is a new type of recovery type overcurrent protection device, which is a thermally sensitive device. After PPTC is powered on, it is in a low resistance state and current can pass smoothly. But when overcurrent occurs in the circuit, PPTC will quickly heat up, generating a large amount of heat, causing its resistance value to rise rapidly. This can prevent excessive current from passing through and protect circuit safety.

　　The resistance value of PPTC not only reflects its protection capability, but is also closely related to the working state of the circuit. Generally speaking, the larger the rated current of PPTC, the greater the amplitude of its resistance change. The following are the resistance values corresponding to different load currents.

　　When the current load of PPTC is 10mA, its resistance value is around 0.8 ohms. At this point, PPTC is in a low resistance state, and current can flow smoothly. However, if the current in the circuit suddenly increases at this time, such as a current of 1A, the resistance value of PPTC will rapidly rise, reaching a resistance value of several tens of ohms. This can effectively protect circuit safety.

　　When the current load of PPTC is 100mA, its resistance value is relatively low, about 0.3 ohms. At this point, the protection capability of PPTC is stronger than that of 10mA, which can effectively prevent problems such as short circuits from occurring. When the current in the circuit suddenly increases, the resistance value of PPTC will rapidly rise, reaching a resistance value of several tens of ohms. This can safely prevent excessive current.

　　When the current load of PPTC is 500mA, its resistance value is about 0.2 ohms. At this point, PPTC already has very strong protection capabilities, which can effectively prevent short circuits in large electrical appliances and easily cope with various complex situations. When the current in the circuit suddenly increases, the resistance value of PPTC will rapidly rise, reaching a resistance value of several tens of ohms. This can safely prevent excessive current.

　　When the current load of PPTC is 1A, its resistance value is around 0.2 ohms. At this point, PPTC is approaching its limit state and can effectively prevent all overcurrent hazards. If the current in the circuit suddenly increases, the resistance value of PPTC will rapidly rise, reaching a resistance value of several tens of ohms. This can protect the circuit from excessive current damage.

　　When the current load of PPTC exceeds 1A, its resistance value will gradually increase and approach a resistance value of several tens of ohms. When the resistance value reaches a certain value, PPTC will completely cut off the circuit to avoid damage and danger caused by high current.