Part identification

I found this old part in a controller of this elevator modernization I am doing, and I am wondering what it is. Google searches have let me down...

I think it is a voltage regulator... it is in a TO3 case and has the markings:

nae 8240 NSR8140A

It has 3 leads (one being the case itself). Any ideas?

-Thanks

Reply to
kayvee
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I did a search on

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and came up with it as a fast recovery 30 amp 100 V rectifier:

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and

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Paul

Reply to
Paul E. Schoen

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