After digging into this a bit more, it appears that component is part of an assembly called the thermoblock. I assume it has to do with heating the water, thus giving the power transistor a reason for being. I don't see any indications that the thermoblock is sold in anything less than a complete assembly; in other words it doesn't look like you can buy just the part you've shown in your photo; rather you have to buy the whole assembly.
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I didn't do an extensive search for the part, but here's one page I found showing a picture of it; the part on the right side looks like what you are seeking.
That's the part number, FL300204, if you want to search it out yourself. It states this is a 230V part, so obviously it's not for use here in the United States; please verify the voltage is correct for your particular model.
After digging into this a bit more, it appears that component is part of an assembly called the thermoblock. I assume it has to do with heating the water, thus giving the power transistor a reason for being. I don't see any indications that the thermoblock is sold in anything less than a complete assembly; in other words it doesn't look like you can buy just the part you've shown in your photo; rather you have to buy the whole assembly.
I didn't do an extensive search for the part, but here's one page I found showing a picture of it; the part on the right side looks like what you are seeking.
[link|https://www.lesitedelapiece.com/p/thermoblock-230v-pour-machine-a-cafe-nespresso-fl300204-62306.html|Thermoblock 230v Nespresso FL300204]
That's the part number, FL300204, if you want to search it out yourself. It states this is a 230V part, so obviously it's not for use here in the United States; please verify the voltage is correct for your particular model.