250R120-R3ZR

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PTC resettable fuses, also known as positive temperature coefficient (PTC) resettable fuses, are thermal-sensitive electronic components used for the protection of circuits in many different applications. The 250R120-R3ZR is one such type of PTC resettable fuse. It is a SPDT-type (single-pole double-throw) resettable fuse which is designed for low voltage and low current protection applications, and is typically used in low-voltage power supply lines.

The 250R120-R3ZR has a 0.24-inch footprint and a maximum current rating of 0.12A (120mA). It consists of a PTC element which is housed in a plastic holder for protection from mechanical and environmental damage.The PTC element is made of a heat-sensitive material where the electrical resistance increases significantly as the element’s temperature increases.

When an overcurrent condition is detected, the PTC element will heat up until the internal temperature is enough to cause its resistance to increase. This increase in resistance causes the current to drop, thus providing overcurrent protection. The heat generated by the PTC element is dissipated through the plastic holder which acts as a heat sink. After the overcurrent has been cleared, the PTC element will cool down and reset, allowing the normal current flow to resume.

This makes PTC resettable fuses ideal for protection of circuits which are exposed to potentially damaging overcurrent conditions, such as automotive systems, telecom systems, aerospace systems, etc. They are also well-suited for applications requiring a high number of reset cycles due to their long-term reliability.

In addition, the 250R120-R3ZR is designed specifically for use in sensitive circuits where high surge currents might otherwise damage components. This resettable fuse can withstand up to six times its rated current, effectively safeguarding any connected components from damage.

The 250R120-R3ZR PTC resettable fuse is an ideal choice for many different applications due to its reliability, current rating, overcurrent protection, and its high surge tolerance. Its robust design allows it to provide reliable protection for a wide range of high-voltage and high-current applications.

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