RXE185

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PTC Resettable Fuses are a type of circuit protection device that can be used in an electronic circuit to prevent damage to connected components in the event of an overcurrent situation.

The RXE185 line of PTC resettable fuses from Littelfuse are low-resistance devices designed to provide reliable overcurrent protection. This type of fuse can detect high currents and reduce them by self-regulating its impedance to the desired level before resetting to a low impedance state.

The RXE185 series of PTC resettable fuses are designed to work in a wide range of applications. These include power supplies, LED lighting, motor control, IGBT modules, heating circuits and electric vehicles. A typical application for this fuse is to provide protection against overcurrents in power supply circuits for automotive LED lighting systems. These LEDs are often charged at high currents in order to achieve the desired brightness, and the protective fuse must be able to cope with this high level of current.

In a Resettable Fuse, a Positive Temperature Coefficient (PTC) polymer material is used as a sensing element. The RXE185 series of fuses is based on a PTC polymer material with a rate of decreasing resistance as temperature increases. The PTC polymer sensing element is connected in series with the electrical circuit. When an overcurrent situation occurs, the resistance in the sensing element increases exponentially which limits the current and reduces the voltage by absorbing excess energy.

The temperature of the PTC polymer increases during an overcurrent situation, causing it to expand and generating a higher resistance. This leads to current limitation and a decrease in voltage across the device. Once the overcurrent situation has been eliminated, the PTC polymer material cools down and the device returns to its low-resistance state.

The RXE185 line of PTC resettable fuses from Littelfuse is a great solution for overcurrent protection in a wide variety of applications. Their reliable performance and low-resistance design make them well suited to use in power supplies, LED lighting, motor control, IGBT modules, and electric vehicle applications. They provide an effective way to protect circuit components and to prevent them from being damaged by overcurrents.

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