15LR380U

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PTC resettable fuses, also known as polymeric positive temperature coefficient (PPTC) devices, are over-current protection devices with these devices automatically opening an electrical circuit once a certain current threshold is exceeded and will not reset until current conditions are reduced. One of the most common types of popular and commonly used PTC resettable fuse is the 15LR380U.

Application Field

The 15LR380U acts as a protective device for low circuit, usually in home-based electrical and electronic appliances as well as in consumer equipment. It is suitable for reliable over-current protection for various power cables, computer and telecommunications peripherals, and various instrumentation equipment. The fuse is a measure of over-current, over-heating and short-circuit protection, and its primary application field is in those areas where other fuse varieties, such as ceramic or glass fuses, may not be able to perform optimally.

Working Principle

The working principle of the 15LR380U is based on the generated heat caused by excess current. As current passes through the circuit with the help of the PTC device, it encounters hundreds of very thin layers of a polymer material. These layers are designed to increase the device’s resistance as temperatures rise. The resistance of the device increases during this process, and any current flows to the other side, safeguards the appliance connected to the circuit.

When the device has cooled down, i.e., the circuit has been properly safeguarded, a characteristic of polymer PTC devices which is not found in some other fuse types is that they automatically reset themselves once the current has dropped. This makes them perfect for scenarios where resetting the fuse after an over-current incident may not be possible, such as within the confines of a sealed box.

The 15LR380U PTC resettable fuse is a powerful and effective tool for comprehensive electrical and electronic protection. Its performance can be improved significantly when paired with circuit design considerations which maximize overcurrent protection and minimize heating concerns. This should be done alongside the careful selection of other components, such as diodes or resistors, to increase the reliability and safety of the circuit.

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