Aumov LV Ultramov Varistor Design Guide Page 14 Varistor Design Guide For DC & Automotive Applications

2015 Littelfuse DC Application Varistor Design Guide www.littelfuse.com DC Application Varistor Design Guide Determine the LV UltraMOV Varistor disc size needed by confirming the surge rating will meet the application requirement. In the following table, we have selected a 14mm MOV with a 31V DC max continuous voltage rating as a possible solution to meet our need. Then, we will use the Pulse Rating curves and V-I curves to verify that the selected MOV can meet the requirements. Pulse Rating Curves: How to Select a Low Voltage DC MOV (continued) Part Number (Base part) Part Number (Base part) Size (mm) Vrms (V) Vdc (V) Min (V) Nom (V) Max (V) Vc (V) I TM (A) V14E23P V14P23P 14 23 28 32.4 36 39.6 71 4000 V05E25P V05P25P 5 25 31 35.1 39 42.9 77 500 V07E25P V07P25P 7 25 31 35.1 39 42.9 77 1000 V10E25P V10P25P 10 25 31 35.1 39 42.9 77 2000 V14E25P V14P25P 14 25 31 35.1 39 42.9 77 4000 V20E25P V20P25P 20 25 31 35.1 39 42.9 77 8000 V10E30P V10P30P 10 30 38 42.3 47 51.7 93 2000 V14E30P V14P30P 14 30 38 42.3 47 51.7 93 4000 V20E30P V20P30P 20 30 38 42.3 47 51.7 93 8000 Pulse Rating Curve for 14mm V14x11P - V14x40P Pulse Rating Curve for 20mm V20x11P - V20x40P 1 10 100 1000 10000 Surge Current (A) Impulse Duration (s) 10 100 1000 10000 1x 2x 15x 10 2 x 10 3 x 10 4 x 10 5 x 10 6 x Surge Current (A) Impulse Duration (s) 1 10 100 1000 10000 10 100 1000 10000 1x 2x 15x 10 2 x 10 3 x 10 4 x 10 5 x 10 6 x 13

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