Varistor Metal Oxide Varistor Products Page 17 Varistor Metal-Oxide Varistor Products

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17 Metal-Oxide Varistors (MOVs) Varistor Connection Examples LINE NEUTRAL GND 1 3 2 FIGURE 23. LINE GND 110V GND 240V LINE GND OR LINE NEUTRAL 120V 240V SINGLE PHASE SINGLE PHASE SINGLE PHASE 3 WIRE 120V/240V 2 WIRE 240V 2 WIRE 110V FIGURE 24. Single Phase This is the most complete protection one can select, but in many cases only Varistor 1 or Varistor 1 and 2 are selected. Three Phase FIGURE 25A. 3 PHASE 220V/380V, UNGROUNDED FIGURE 25B. 3 PHASE 220V OR 380V, UNGROUNDED FIGURE 25C. 3 PHASE 220V, ONE PHASE GROUNDED FIGURE 25D. 3 PHASE 220V If only 3 suppressor use 1-GND, 2-GND, 3-GND FIGURE 25E. 3 PHASE 120V/208V, 4-WIRE If only 3 suppressor use 1-GND, 2-GND, 3-GND FIGURE 25F. 3 PHASE 240V/415V For higher voltages use same connections, but select varistors for the appropriate voltage rating. 1 2 3 4 380V 220V SUPPRESSOR CONNECTION 1 - 4 2 - 4 3 - 4 1 2 3 (380V) SUPPRESSOR CONNECTION 1 - 2 2 - 3 3 - 1 220V 1 2 3 SUPPRESSOR CONNECTION 1 - 2 2 - 3 1 - 3 220V 1 2 3 SUPPRESSOR CONNECTION 1 - 3 1 - 2 2 - 4 110V 220V 3 - 4 4 110V LOWER VOLTAGE 3 2 1 208V 110V SUPPRESSOR CONNECTION 1 - 2 1 - 3 3 - 2 110V 208V 1 - GND 2 - GND 3 - GND 3 2 1 415V 240V SUPPRESSOR CONNECTION 1 - 2 1 - 3 3 - 2 240V 415V 1 - GND 2 - GND 3 - GND 240V

Previous Page
Next Page