PTC Resettable Fuses

PTC resettable fuses are devices that offer both thermal protection and overcurrent protection in one package. The KEMET RL5305-2.5-110-12-PTF is a good example of such a device.

The RL5305-2.5-110-12-PTF provides excellent temperature-sensitive protection in an ultra-small, thermally enhanced package. It incorporates a glass-encapsulated Negative Temperature Coefficient element and an overcurrent sensing mechanism. The fuse element starts its thermal protection function at 105°C, and the overcurrent protection starts trigger at 110-115°C.

Application Field

As a resettable fuse, RL5305-2.5-110-12-PTF is widely used in field of electronics, such as consumer electronics, telecommunications, industrial control products, and automotive electronic accessories. It offers a reliable and cost-effective solution as a current-limiting fuse for various applications.

Due to its compact size and excellent electrical characteristics, the RL5305-2.5-110-12-PTF is typically used in LCDs, digital cameras, notebook computers, and automotive electronic systems. Besides, this fuse can be used with various power management systems such as switching regulators, OR-ing diodes, USB hubs, and DC-DC converters.

Working Principle

The RL5305-2.5-110-12-PTF works to protect the target electrical circuit from both overcurrent and overtemperature conditions. In case of overtemperature, the device will trip when the temperature reaches 105°C. In the overcurrent condition, the device trips when the current reaches a preset threshold.

The RL5305-2.5-110-12-PTF works by utilizing two mechanisms: a thermal sensing element and an overcurrent sensing element. The thermal sensing element is an in-line resistor that senses temperature within the device and instantly trips when the temperature reaches 105°C. An overcurrent sensing element is incorporated to detect the presence of current overloads to trip the device whenever the current reaches the preset threshold.

The RL5305-2.5-110-12-PTF offers short-circuit protection, ensuring the target application is not damaged by any surge or overcurrent conditions. The device is also self-reset, allowing for an automatic reinstatement of the circuit after the fault condition is removed.

In addition, the RL5305-2.5-110-12-PTF features a very low resistance, so it does not significantly affect the circuit\'s power efficiency. As such, this device is a good choice for use in applications that require maximum power efficiency.

Conclusion

The RL5305-2.5-110-12-PTF provides a reliable solution for both overcurrent- and overtemperature protection. This resettable fuse is widely used in consumer electronics, automotive systems, and industrial control applications, and offers a cost-effective and efficient way of protecting electronic components and circuits.