19. MOV Protection & Failures

Question.5

A 230VAC surge protection circuit uses a MOV across L-N — but no fuse is installed upstream.
The MOV works correctly for 3 years, absorbing small surges.
Eventually the MOV degrades and fails short circuit.
What happens next?

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Circuit stops working — MOV blocks power
Nothing — MOV short has no effect
MOV draws continuous current — overheats and fire risk
Mains supply breaker trips immediately