LR4-550F

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PTC Resettable Fuses, commonly known as polymeric positive temperature coefficient (PPTC) devices, are designed to protect electronic components from both thermal and electrical damage. They are used in a wide range of applications from consumer electronics to industrial equipment and cars. These fuses are ideal for protecting sensitive circuitry from overloads. The LR4-550F is one of the most common resettable fuse products on the market.

The LR4-550F is a high-resistance, single-pole, multipurpose resettable fuse. It is designed for use with alternating current (AC) and direct current (DC) up to 500 volts. The device features a low resistance when it is first connected and then gradually increases in resistance when exposed to overloads or fault currents. This protects the circuits and components from being damaged due to excessive current levels. Once the current is removed and the temperature drops to normal levels, the fuse will automatically reset and return to the low-resistance state.

In addition to protecting against overloads, the LR4-550F also offers other protection features. Its thermal protection circuit helps to protect against thermal stress and reduce component aging caused by prolonged exposure to elevated temperatures. Its transient protection circuit helps to prevent electrical overcurrent spikes that could potentially damage connected electronics. Finally, its surge protection circuit helps to protect against large voltage transients that could otherwise cause burnouts and power failures.

The LR4-550F resettable fuse is a cost-effective solution for the protection of a wide range of electronic components and circuits. Its versatile features and design make it suitable for a wide variety of applications including appliances, automotive, control systems, IT and telecommunications equipment, and much more. In addition, the device is UL recognized and meets many safety and fire protection standards.

The LR4-550F is a relatively simple device, despite its narrow design and wide range of protective functions. Its working principle is based on the principle of the thermistor. In a normal state, the thermistor will draw a small amount of current and maintain a low resistance. However, when exposed to an overload or fault current, the resistance in the thermistor will increase sharply. This will then trip the device and prevent excessive current from flowing, thus protecting the circuit from damage.

The LR4-550F is an invaluable addition to many electronic projects and applications. Its resettable design means that it can provide significant cost savings over replaceable fuses. Furthermore, the fact that it can provide a wide range of protection features makes it an excellent choice for protecting sensitive electronic components. Its reliable and easy-to-implement design make it an attractive product to a wide range of customers.

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