MLVs are constructed in various chip form sizes and are capable of significant surge energy for their physical size. Another feature of the Varistor that can be seen from the VI characteristics is that , even when there is an increase in current, the voltage across it remains almost equal to the clamping voltage. Onetouch FIGURE 26. Silicon carbide varistor – At one time this was the most common type before the MOV came into the market. Under the right conditions of over-voltage and line impedance, it may be possible to cause the MOV to burst into flames,[21] the root cause of many fires[22] and the main reason for NFPA's concern resulting in UL1449 in 1986 and subsequent revisions in 1998 and 2009. They are like all other Varistors, mostly used in protective circuits.
From the very basic fixed resistors, where the resistance remains unchanged, to different types of variable resistors, whose resistances change according to different factors. The ratings indicate a level of stress which may be applied to the device without causing degradation or failure. Varistors are rated for a maximum pulse energy surge that results in a varistor voltage (VN) shift of less than +/-10% from initial value. Good informative article. Weil Littelfuse Ihr Recht auf Datenschutz respektiert, können Sie die Cookies-Option ändern und einige davon verbieten. MOVs are specified according to the voltage range that they can tolerate without damage. What's the right way of removing an indoor telephone line? However, (ROFF) remains at a high resistance value even at elevated temperatures. The following displays a list of example end applications where Littelfuse Varistor products are typically used. Surface mountable MOV (Metal Oxide Varistor) devices facilitate customs in SMT assembly process and resolve the PCB space limitation issue. The devices have a high current handling, high energy absorption capability and fast response times to protect against transient faults up to rated limits. ________ (pF), 1-i.
RX STATIC VARISTOR RESISTANCE FIGURE, FIGURE 16B. Each of these events can relate to a product's ElectroMagnetic Compatibility (EMC), or its immunity to transients that could cause damage or malfunction. Automobil-Sensorprodukte von Littelfuse bieten zahlreiche Sensoren zur Überwachung verschiedener Fahrzeugfunktionen in den Bereichen Fahrgastsicherheit, Komfort und Bequemlichkeit sowie Antriebs-, Fahrwerks- und Emissionsanwendungen von Fahrzeugen.
The Metal Oxide Varistor or "MOV" is sintered during the manufacturing operation into a ceramic semiconductor and results in a crystalline microstructure that allows MOVs to dissipate very high levels of transient energy across the entire bulk of the device. Form factor/package style also must be considered. FIGURE 18.
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