MF-SM050-2-99 Circuit Protection

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PTC Resettable Fuses have become one of the most widely used electronic components in various kinds of electronic equipment. They are used for overload current protection, so as to ensure the safety of the circuit operation. MF-SM050-2-99 is a typical positive temperature coefficient (PTC) resettable fuse, which is mainly used in automotive appliances like security systems, airbag systems and automotive electronic control units, etc. In this article, we will look at its application field and working principle.

Application field
The MF-SM050-2-99 component finds its applications in several aspects including automotive applications, home appliance control systems, electric motors, and other general-purpose automotive power supply protection systems. It can be used to protect the short circuit current and overload current in the power supply system. Moreover, its high voltage grade makes it suitable for use in power supply systems with a 250 V or higher working voltage.

Working principle
This resettable fuse works by using an organic glass-filled positive temperature coefficient (PTC) thermistor that operates using a self-resetting principle. Upon detecting an abnormal over-current, the fuse will heat up due to increased resistance, causing the fuse to trip and disconnect the circuit. This process provides quick, reliable and repeatable junction over-current protection. The resetting of the fuse requires it to cool before it re-establishes normal circuit operation with the device returning to its original state. This resettable fuse also offers thermal feedback temperature protection against extreme temperatures beyond its rated temperature.

The MF-SM050-2-99 PTC Resettable Fuse has an operating temperature range from - 40℃ to +125℃, protection overload current is 3 A at 25℃, instantaneous trip current is 5A at 25℃ and can operate up to a DC 250 V working voltage. Moreover, it has a maximum leakage current of 0.1 mA at 25℃. In addition, it features excellent electrical stability and a durable design to ensure consistent performance in time.

The PTC Resettable Fuse provided by MF-SM050-2-99 is a reliable and sophisticated component that finds its application in automotive applications, home appliance control systems, electric motors and other general-purpose automotive power supply protection systems. It can be used to detect overloads and short circuits in circuits, provide protection and eventually reset after cooling down. This resettable fuse is energy efficient, efficient in operation and quite durable.

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