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{839} Why MOV metal oxide Varistor or vdr voltage dependent resistor, voltage arrester or tvs transient voltage suppressor (either unidirectional tvs or bidirectional tvs, class x or x-rated safety capacitor or class y capacitor is Not before Fuse, why mov varistor protection is connected after fuse.
because fuse is a "short circuit current" protection and it is connected in entrance the supply voltage. due to any abnormal spikes of voltage or frequency will make internal short circuit to the mov / tvs / transil / thyrector, which will cause to produce a short circuit link across the line input voltage terminals. in result the input fuse will blow away from the unwanted voltage strikes, so the circuit will become protected. in case high frequency spikes the x-rated capacitor will provide our desired short circuit link across the line input voltage terminals. in result the input fuse will blow away from the unwanted high frequency strikes, so the circuit will become safe.
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