PTS18126V300 Circuit Protection

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PTC (Positive Temperature Coefficient) resettable fuses are current-limiting devices that can provide circuit over-current protection. They are suited for protecting automotive, industrial, and consumer electronic systems; for example, they are used to protect low voltage DC power supplies, allowing an over-current condition to persist until a predetermined current level is exceeded before the fuse is triggered. The PTS18126V300 is a PTC resettable fuse and is used for many applications.

The PTC resettable fuse consists of a specialty polymer, which has a positive temperature coefficient. When current flows through the PTC element, it will produce a small amount of heat. If the amount of current is greater than the designed rating, the heat will cause the resistance of the polymer to increase. Eventually, this will generate enough heat to melt a solder joint at the output of the fuse, thus disrupting the current.

The main advantage of using a PTC resettable fuse is that it can reset itself after the over-current condition has been addressed. After the normal current level is again reached, the solder joint will re-establish itself and the current flow will resume. This regenerative capability eliminates the need to replace the fuse elements during a period of over-current operation.

The PTS18126V300 is a low voltage, 300mA rated, dual-element device with a trip current rating of 1.8A. It is designed for over-current protection in low voltage DC applications, such as those found in automotive, industrial, and consumer electronic systems.

The device features a small package size and low profile, which makes it suitable for use in even the most space-constrained systems. The device also features a wide operating temperature range of -55°C to +85°C, making it an ideal solution for applications in extreme environments.

The working principle of the PTS18126V300 is based on its two elements. The first element is the Micro Elec dual-current sensor, which senses the amount of current flowing through the device. The second element is the PTC resettable fuse itself, which responds to the sensed current by either allowing the current to flow or tripping the PTC element.

In operation, when the current through the device exceeds the rated trip current, the microelectronic current sensor will detect the over-current condition and trigger the PTC element. This causes the resistance of the element to increase, thus halting the current flow and protecting the circuit from overload. If the current conditions are corrected, the heat generated by the PTC element will dissipate and the device will automatically reset to its normal operating condition.

The PTS18126V300 is a versatile device and can be used in a variety of applications, including alternate energy sources, DC-DC converters, motor drives, and battery packs. It is also ideal for automotive and industrial systems that require reliable and cost effective over-current protection.

In conclusion, the PTS18126V300 is a reliable and cost-effective PTC resettable fuse that is suitable for use in many low voltage DC applications. The device is small, lightweight, and features a wide operating temperature range and a 1.8A trip current rating. It is capable of providing circuit over-current protection, while resetting itself after the over-current condition has been addressed.

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