PTCCL11H321FBE

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PTC resettable fuses, also known as polymeric positive temperature coefficient devices, are a type of surge-dependent smoldering current protective device. They are widely used in smaller electrical circuits due to their low cost and simple installation. This article will focus on PTCCL11H321FBE, discussing the application field and working principle.

The PTCCL11H321FBE is a polymeric resettable fuse rated at 100 amps operating at 32 volts, and is suitable for applications requiring a highly robust and cost-effective protection solution. They are ideal for use in power supplies, low voltage power converters, and inverters. The device is also used to protect circuits such as AC line cords, load switches, motor drives, and fuses. Its small size and low profile make it ideal for applications that require a high degree of electrical protection.

The PTCCL11H321FBE is a self-resetting fuse, meaning it is designed to automatically reset after an overcurrent event. This feature eliminates the need to replace damaged components, and reduces downtime for electrical maintenance. Furthermore, it can also be used as a circuit disconnect, allowing circuit breakers to be used as the main power source while the PTC device can be used as an additional layer of protection.

The working principle of the PTC device is based on the thermistor effect. It consists of a thermistor element, a junction metal, and a metal oxide semiconductor. The thermistor has a positive temperature coefficient, which means that its resistance increases as the temperature rises, thereby protecting the device from overcurrent. The junction metal and metal oxide semiconductor provide the necessary conduction path between the two electrodes, allowing for current flow.

When overcurrent occurs in the circuit, the temperature of the device rises and the thermistor element’s resistance increases, thus effectively reducing the available current. This results in a self-limiting process where the temperature of the device eventually stabilizes and the device automatically resets itself. In this way, the device is able to provide long-term and reliable protection from overcurrent and thermal overloads.

In summary, the PTCCL11H321FBE is a robust and cost-effective resettable fuse with an operating voltage of 32 volts and a current rating of 100 amps. It is suitable for a wide range of applications, including power supplies, low voltage power converters, and inverters. The fuse is also self-resetting due to its thermistor element, which effectively reduces the available current when an overcurrent occurs. This makes it an ideal solution for providing reliable protection from overcurrent and thermal overloads.

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