B59990C0120A051

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PTC Resettable Fuses, also known as Polymeric Positive Temperature Coefficient (PPTC) Resettable Fuses, have become increasingly popular among electronic applications. The B59990C0120A051 is a typical PTC Resettable Fuse, widely used in a variety of electronics like automotive electronics, smart phones, and medical devices.The most important characteristic of PTC Resettable Fuses is their ability to re-establish current after an over-current situation. This is because the fuse element is made of a special polymer material that has a positive temperature coefficient (PTC). When the current is over, the polymer element quickly increases its resistance accordingly, thus limiting the current and protecting the circuit against damage from current overload.The B59990C0120A051 is designed for a variety of applications, with a wide operating temperature range from -40℃ to 85℃. The rated voltage, current, and hold current of this PTC Resettable Fuse are 16V, 6A, and 3A respectively. It is designed with a fast response time of 6ms max and can self-recover after the overloading situation ends. The overall size of this fuse is 9.45mm × 4.45mm × 4.72mm, which allows it to be used in environments with limited space.The working principle of this PTC Resettable Fuse is quite simple. When a normal current flow through it, the thermal energy generated by the current flow is low, resulting in a low temperature of the PTC element. It then remains in a low resistance state, which allows the current flow normal and prevents it from reaching overcurrent levels.However, in the case of an overload, the thermal energy rises and the temperature of the element increases correspondingly. As the temperature rises, the resistance of the PTC element rises until it reaches the hold current level. In this situation, the current is limited and the circuit is prevented from further damage.When the overload circuit is removed, the PTC element cools down and quickly recovers to its original low resistance state, thus allowing the normal current flow to resume. The PTC element can reset itself multiple times and continue to protect the circuit from overloading for many cycles.

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