Back E.M.F Protection: Selecting Diodes & Surge Suppression

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atif010
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Help me. I want to use diode for back E.M.F protection.Please help me to select diode which is suitable ,like short circuit recovery time is 9 nano second and ifsm should be 30-90 amp. please also send me surge suppression protection circuit or surge protection device.
 
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use 1n4007 diode or RC circuit.
 

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