The Need for Transient Suppression When an electromechanical relay is de energized rapidly by a mechanical switch or semiconductor, the collapsing magnetic field produces a substantial voltage transient in its effort to disperse the stored energy and oppose the sudden change of current flow. A 12VDC relay, for example, may generate a voltage of
Transient voltage suppressor. One such common device used for this purpose is known as the transient voltage suppression diode that is simply a Zener diode designed to protect electronics device against overvoltages. Another design alternative applies a family of products that are known as metal oxide varistors (MOV) that protect electronic circuits and electrical equipment.
Transient suppression devices can be used in series with the load to either attenuate or reduce the energy value of a transient preventing its propagation through a circuit, or they can be used in parallel with the load to divert the transient away, usually to ground, and so limit or clamp the residual voltage.
Transient Suppressors. Made to absorb transients caused when an inductive field collapses, like in a motor, which is by nature, high IMP. When the voltage goes up, the suppressor goes to short. Made for 100 vdc or 71 vac. Install parallel with motor winding.
Main causes of transient overvoltages Direct strike on overhead line Indirect lightning strike Surge current Grounding Ground equipotentiality Induced overvoltage Strike on a lightning rod 1 ABB Contents: 1. Main causes of transient overvoltages 3. The solution: ABB OVR Transient Voltage Surge Suppressor Series 5. Selection / Application 8.
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transient voltage surge suppressors What to look for when purchasing a surge suppressor: Metal housing (plastic may catch fire). UL approved (meets UL1449 specifications). Clamping voltage the clamping voltage of the surge suppressor should fall slightly below the withstand voltage of your equipment (i.e. if your
TransGuard® Transient Voltage Suppressors (TVS) with unique high energy multilayer construction represents state of the art overvoltage circuit protection. Monolithic multilayer construction provides protection from voltage transients caused by ESD, lightning, NEMP, inductive switching, etc. True surface mount product is provided in EIA ...
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Transient Suppression Devices and Principles Transient Suppression Devices There are two major categories of transient suppressors: a) those that attenuate transients, thus preventing their propagation into the sensitive circuit; and b) those that divert transients away from sensitive loads and so 100limit the residual voltages.