Model# tsf49sd ser#df49301015
So, I take it you got that part number off the compressor. That's actually a Tecumseh part number, the original component manufacturer (OCM) who makes components for the original equipment manufacturer (OEM), in this case, TurboAir.
I'm trying to find a suitable replacement but have come up empty so far. If you register, you may attach the picture here. It may help.
For the other users, I came up with this info about 3-arr3t5n3:It appears to be a Tecumseh Lunite potential relay. So, a compressor relay if I'm reading correctly. Relay possibly originally made by GE based on similar relay numbers I've found across the web.
What's the compressor model number. If it's a AJA 2425 ZXA it will be a K71-18 start relay, 370 volt 15uf run capacitor and a 330volt 161-193 uf start capacitor. K146-78 These are Tecumseh numbers.
One must always verify the compressor, as they get replaced or sometimes the manufactors uses something other than the original design due to shortages or specials.
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