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The non-conductive crystalline organic polymer matrix of a polymeric PTC device is loaded with carbon black particles to make it conductive.
The polymer is crystalline when it is cold, and the carbon is pushed into the spaces between the crystals, forming numerous conductive chains.
It will carry a current because it is conductive (the “initial resistance”).The device will begin to heat if an excessive amount of current is passed through it.
The polymer will expand as the device heats, transitioning from a crystalline to an amorphous state.The device heats up faster and expands more as a result of the expansion, which separates the carbon particles and breaks the conductive pathways, further increasing the resistance.
The circuit’s current is significantly reduced by this resistance increase. The device still has a small leakage current flowing through it, which is enough to keep the temperature at a level that will keep it in the high resistance state.
At the rated voltage, leakage current can range from less than 100 mA to several hundred mA at lower voltages. It is possible to say that the device has latching capabilities.
The maximum current at which the device is guaranteed not to trip is known as the hold current. The current at which the device is guaranteed to trip is known as the trip current.
The PPTC device will cool down and stop heating as a result of the leakage current when power is cut off. The device returns to its original crystalline structure and a low resistance state as it cools, allowing it to maintain the specified current.
This cooling typically takes a few seconds, but unless the device’s power is weaker or it has been used a lot, it will keep a slightly higher resistance for hours if it is tripped.
Even if the fault has been isolated and the power is still flowing, the resetting will frequently fail because the operating current may be greater than the PPTC’s holding current.
It’s possible that the device won’t regain its initial resistance value ;It will probably stop moving at a much higher resistance. When the device returns to a resistance value that is comparable to its initial value, if at all, it could take hours, days, weeks, or even years. There are current and voltage ratings for PPTC devices.
The Global Polymer PTC Fuses market accounted for $XX Billion in 2021 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2022 to 2030.
Bel Wire Inc. radial-leaded 0ZRM PTC Fuse Series has been added to BELFB’s expanding portfolio of Polymeric Positive Temperature Coefficient (PPTC) resettable fuses. BELFB is a leading manufacturer of fuses and magnetic-based solutions for high-speed networking and computer applications.
The new RoHS-6-compliant devices have a one-of-a-kind polymer formulation that allows for unparalleled dependability and long-lasting performance at 120 VAC/VDC.
Products and systems can be shielded from overcurrent surges and over temperature faults thanks to their ability to restrict the flow of dangerously high current during fault conditions.
After a fault occurs, the components reset themselves, allowing the circuit to resume normal operation even when power is removed. Because they can be reset, they’re a great alternative to traditional fuses and fusible links because they let original equipment manufacturers (EOEMs) save money on repairs, maintenance, and warranties. Materials meet the requirements of UL-94V-0.
The 0ZRM Series from Bel is an excellent choice for use in a wide range of consumer, industrial, and commercial electronic products where safety and dependability are important.
For telecom and data applications like NIDS (Network Intrusion Detection Systems), WAN, LAN, and T1/E1, as well as for systems designed to UL60950 and Telcordia GR-1089, parts are frequently specified.
These resettable fuses are frequently utilized in computer applications, including peripheral circuits, keyboards, mice, USB ports, disk drives, and storage devices. They are also suitable for protecting circuits in digital video recorders, set-top boxes, and battery chargers.
