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component needs identification

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I'm repairing an office shredder and I have one component that's scorched the circuit board. Discounting the contacts it measures 5/32" or 4 mm across and has imprinted on its side: IN 4749A and below that: 51 I have attached 2 JPGs showing both sides. Any help identifying it would be appreciated. Thanks. Oh yes, printed on the circuit board itself is: ZD1 Note the single black band at one end of this bugger.


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