I can't tell you how to do your job, all I can tell you is how I do it.
I break down every thing. However, I scrap a lot of electronics. When I do get appliances, I scrap out the wire, motor(s), heating elements etc...
If you can find an electrical distributor you mind be able to sell them the switches and fuse boxes, transformers etc to make more on each appliance. I however do not have an electrical distributor, so I just scrap the transformers and break the copper/brass out of the fuse boxes and switches ( when available ). I do keep the plastic, because I have a buyer for mixed plastics.
Either way, you (almost) always make more $$$$/pound if you breakdown to the fullest. You will also get more item(s) to scrap when you break it all down, which most of the time = more money.
I hope this helps you some.
Happy Scrappin!!!
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