Varistor Metal Oxide Varistor Products Page 18 Varistor Metal-Oxide Varistor Products

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17 Metal-Oxide Varistors (MOVs) DC Application DC applications require connection between plus and mi- nus or plus and ground and minus and ground. For example, if a transient towards ground exists on all 3 phases (common mode transients) only transient suppressors connected phase to ground would absorb energy. Transient suppressors connected phase to phase would not be effective. On the other hand if a differential mode of transient (phase to phase) exists then transient suppressors connected phase to phase would be the correct solution. This is just a selection of some of the more important varia- tions in connecting transient suppressors. The logical approach is to connect the transient suppressor between the points of the potential difference created by the transient.The suppressor will then equalize or reduce these potentials to lower and harmless levels. FIGURE 26A. INCORRECT FIGURE 26B. CORRECT FIGURE 26. COMMON MODE TRANSIENT AND CORRECT SOLUTION COMMON MODE TRANSIENT FIGURE 27A. INCORRECT FIGURE 27B. CORRECT FIGURE 27. DIFFERENTIAL MODE TRANSIENT AND CORRECT SOLUTION DIFFERENTIAL MODE TRANSIENT Varistor Connection Examples (continued)

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