LR4-190LF

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PTC Resettable Fuses

PTC resettable fuses, also known as polyfuses, are an integral part of the modern circuit protection system. They are one-time fuses that are designed to open up and disconnect itself if the load current exceeds its rated current or voltage. Once this happens, the fuse must be replaced with a new one, and it cannot be reused. It is designed in such a way that it offers protection against overload and short-circuit conditions, similar to traditional fuses, yet with the benefit of resetting itself after the event when the fault has been cleared.

The LR4-190LF is a resettable fuse developed specifically for surface-mount applications. It is capable of passing currents up to 2A with a trip current of 3.5A. With a voltage rating of 10V, it is suitable for many automotive and power applications that require higher-current protection. It also features a low profile design and can be used in both horizontal and vertical orientations.

The working principle behind the LR4-190LF is quite simple. When the circuit is connected to the LR4-190LF, it acts like a regular fuse in that it will blow if the current exceeds its rated value. However, unlike a traditional fuse, it will reset itself once the fault is removed. This is done by leveraging a patented positive temperature coefficient (PTC) design. The PTC uses a resistive element that heats up when a higher than normal current passes through it. This increases its resistance until it eventually reaches a point where it acts as an open circuit, effectively interrupting the power flow. Once the fault is cleared and the component cools down, the resistance of the element is reduced and the fuse is reset.

The LR4-190LF is designed for a wide range of applications including automotive, power supplies, communication equipment, and industrial control systems. Due to its resettable design, it is a great alternative to traditional fuses that must be replaced each time they blow due to a fault. It offers a cost-effective form of circuit protection that can be used in many applications that require higher currents. It is also much smaller than traditional fuses, allowing it to be used in space-constrained applications.

The LR4-190LF is an excellent choice for many circuit protection needs. With its innovative PTC design, it offers a reliable and cost-effective form of protection that is suitable for a wide range of applications. It also adds a level of safety to the system as it can reset itself after a fault has been cleared. This is a great benefit for many applications that require higher currents. Furthermore, its small size makes it suitable for use in space-constrained systems.

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