41. MOV Basics

Question.6

Two MOVs are both rated at V_1mA = 470V (varistor voltage).
● MOV A: 7 mm disc
● MOV B: 20 mm disc
Do they provide the same surge protection?

Yes — same voltage, same protection
Yes — size only affects mounting
No — larger disc absorbs more energy
No — larger disc has higher voltage

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