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PTC Resettable Fuses

PTC resettable fuses are a form of overcurrent protection that trips and automatically reset if the current exceeds a specific limit. Unlike traditional fuses, which are designed to blow when the current exceeds the predetermined rating, PTC resettable fuses can be reset by the user when the trouble is corrected. This allows for more efficient operation and maintenance as replacement fuses are not required.

SMDCH125F/24-02 Application Field and Working Principle

SMDCH125F/24-02 is a PTC resettable fuse with a rated current of 125A and a trip current of 140A. The operating voltage is 24VDC. Applications that use the SMDCH125F/24-02 fuse include motor overloads, LED lighting, usage in power distribution boards, and automotive system overload protection. The SMDCH125F/24-02 is a polymeric positive temperature coefficient (PPTC) resettable fuse, meaning it utilizes a resistance element with a thermally sensitive material to detect unpredictable electrical current and quickly reduce and ultimately cut off the current when the danger passes. The addition of this molten material increases the thermal conductivity when current passes, causing an increase in the resistance of the element and thus limiting current flow. When the current subsequently reduces, the thermal conductivity reduces, lowering resistance and allowing current to pass again.

The SMDCH125F/24-02 differs from other resettable fuses in that it is a surface mount device, meaning it can be easily mounted onto a PCB or other electrical device due to its small form factor and light weight. The PTC fuse also has a high temperature resistance and excellent flame retardance, making it more reliable in temperature and humidity ranges beyond the typical scope. In addition, it features good solderability and stability in high current environments, and is well-suited for use in large automotive systems.

The SMDCH125F/24-02 PTC resettable fuse is an efficient and cost-effective solution to protecting electronic components from low level to high level overloads. The SMDCH125F/24-02 can quickly and accurately detect potential electrical risks and act to protect vulnerable systems without the need for manual intervention. By providing a convenient and reliable form of overcurrent protection, the SMDCH125F/24-02 is an ideal choice for engineers who need an efficient solution for safeguarding their electronics.

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