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  • Transient Suppression Devices & Principles (.pdf)
    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 limit the residual voltages. Attenuating a transient, that is, keeping
  • AC Line Voltage Transients and Their Suppression (.pdf)
    to stray electrical transients which may be present in the distribution system. The initial use of semiconductor devices resulted in a number of unexplained failures. Investigation into these failures revealed that they were caused by transients, which were present in many different forms in the system
  • Littelfuse Varistors - Basic Properties, Terminology and Theory (.pdf)
    Varistors are voltage dependent, nonlinear devices which have an electrical behavior similar to back-to-back zener diodes. The symmetrical, sharp breakdown characteristics shown in Figure 1 enable the varistor to provide excellent transient suppression performance. When exposed to high voltage
  • Lightning Transients
    into the common earth paths of the earthing system of the installation. The ideal transient suppression device would be an open circuit at normal voltages, would conduct without delay at some slight voltage above normal, would not allow the voltage to increase during the clamping period, would handle
  • Keeping coax safe
    voltages imposed on the wire. Though transient suppression is relatively straightforward in ordinary wires, there are complications that arise when protecting coaxial cables. Protectors must limit the transient voltages on both the outer shield and center conductor. And this protection must not affect
  • Surge and Filter Protection Devices and Applications
    cases, these costs far outweigh the cost of just replacing the damaged components. The costs associated with the prevention of even a single failure with the proper use of transient and noise suppression devices will be minimal compared to the actual costs of failure due to down time.
  • Littelfuse Varistor Design Examples (.pdf)
    shown in Figure 1b to be used on residential 117VAC lines. A representative transient generator is to be used for testing as shown in Figure 1a. If the transient is applied to the existing circuit, the rectifier will receive high negative voltages, transmitted through the filter capacitor. The LC
  • Considerations for Selecting Littelfuse MOVs and Fuses for Industrial Motor Applications (.pdf)
    include medium and heavy motors. Transient over-voltage suppression in these applications typically require Industrial Metal Oxide Varistors (MOVs) for induced lightning surges or for switching transients created by the motor itself.These situations demand that the MOV ratings match the surges found
  • The ABCs of Littelfuse Multilayer Suppressors (.pdf)
    components. They are offered in different designs to accommodate different suppression requirements. For an initial determination of which type is suitable, it is desirable to know: 1. The working voltage or maximum system voltage. 2. The type of transient that is to be suppressed and its energy level. 3

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