250R120-RAZR Circuit Protection |
|
| Allicdata Part #: | 250R120-RAZRTB-ND |
| Manufacturer Part#: |
250R120-RAZR |
| Price: | $ 0.26 |
| Product Category: | Circuit Protection |
| Manufacturer: | Littelfuse Inc. |
| Short Description: | PTC RESET FUSE 60V 120MA RADIAL |
| More Detail: | Polymeric PTC Resettable Fuse 60V (250V Int) 120mA... |
| DataSheet: |  250R120-RAZR Datasheet/PDF |
| Quantity: | 1000 |
| Moisture Sensitivity Level (MSL): | 1 (Unlimited) |
| Lead Free Status / RoHS Status: | Lead free / RoHS Compliant |
| 1200 +: | $ 0.23568 |
| 2400 +: | $ 0.22349 |
| 3600 +: | $ 0.21943 |
| 6000 +: | $ 0.21130 |
| 12000 +: | $ 0.20318 |
Specifications
| Resistance - Initial (Ri) (Min): | 7 Ohms |
| Approvals: | cURus, TUV |
| Lead Spacing: | 0.201" (5.10mm) |
| Thickness (Max): | -- |
| Height - Seated (Max): | 0.433" (11.00mm) |
| Size / Dimension: | 0.256" L x 0.181" W (6.50mm x 4.60mm) |
| Package / Case: | Radial, Disc |
| Mounting Type: | Through Hole |
| Ratings: | -- |
| Operating Temperature: | -40°C ~ 85°C |
| Resistance - Post Trip (R1) (Max): | 16 Ohms |
| Series: | POLY-FUSE®, 250R |
| Time to Trip: | 2.5s |
| Current - Trip (It): | 240mA |
| Current - Hold (Ih) (Max): | 120mA |
| Current - Max: | 3A |
| Voltage - Max: | 60V (250V Int) |
| Type: | Polymeric |
| Moisture Sensitivity Level (MSL): | -- |
| Part Status: | Active |
| Lead Free Status / RoHS Status: | -- |
| Packaging: | Tape & Box (TB) |
Description
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PTC resettable fuses are highly useful, particularly in terms of protecting consumer electronics products from overloads, short circuits and other potentially damaging conditions. One of the most popular and reliable resettable fuse types is the 250R120-RAZR, which is a positive temperature coefficient (PTC) resettable fuse. This article will explain the application fields and working principle of the 250R120-RAZR resettable fuse.A 250R120-RAZR is primarily used as a two-phase power supply, protecting both phase and neutral in two independent paths. The two paths are connected in series to promote the load sharing, further challenging the safety requirements of consumer electronics. Furthermore, this type of PTC resettable fuse has an operating trip current of around 2.5A and a hold current of about 0.19A, but these values may vary depending on the manufacturer.Generally, a 250R120-RAZR has two main components – a thermistor, which is a non-linear resistor and a electrode. Both the thermistor and the electrode are surrounded by a specially designed epoxy coating. This two-component structure allows for improved temperature profile and better reliable operation.The thermistor element is an important part of the functioning of the 250R120-RAZR. It operates on the principle of PTC, which means that its resistance increases with the rise in temperature. The thermistor can be designed to be very sensitive to even minuscule temperature changes, thereby causing it to trip and break the circuit.The electrodes are another component of the 250R120-RAZR and come in different sizes, designs, and materials. They are usually designed to ensure smooth and reliable operation and better protection. Furthermore, they come in both positive and negative polarity, which allows these fuses to be used in various different applications.The other major component of the 250R120-RAZR is the arc chamber, which is a special chamber that stores excess heat when the fuse blows. This prevents the production of hot spots on the fuse, as well as the formation of potentially hazardous arcs. It also ensures that the fuse will not be damaged even after it trips repeatedly.The main application fields of the 250R120-RAZR are devices and circuits that require reliable power supply. These include laptops, desktop computers, tablets, phones, digital cameras, and medical equipment. The reliability of this resettable fuse makes it suitable for use in any of these products.The working principle of the 250R120-RAZR is relatively simple. When the system experiences a surge of current or voltage, the thermistor senses this and instantly starts to heat up. This increase in temperature is picked up by the electrode and is then sent to the arc chamber, where the heat is dissipated. As the heat is dissipated, the circuit is able to recover back to normal operating conditions. In case the over current, over voltage, or overload persists, the thermistor and electrode will heat up again, causing the fuse to trip once more. This cycle will repeat itself until the fault is rectified, protecting the equipment from damage.In conclusion, the 250R120-RAZR is a reliable PTC resettable fuse that offers effective protection against over current, over voltage, and overloads. The two-path structure of the fuse ensures that both the phase and neutral paths are connected on independent paths, meaning that the load is equally shared. Additionally, the thermistor, electrodes, and arc chamber of the fuse all improve the reliable operation and ensure that the fuse withstands repeated tripping events, further reinforcing the reliability of the version. The wide range of applications to which this type of fuse can be applied makes it a suitable protection option for any consumer electronics product.
The specific data is subject to PDF, and the above content is for reference
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