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We have an electric furnace in our mobile home. It was throwing the breaker off so an electrition disconnected an element. Is this furnace still good to use in the winter? If someone could let me know if it should be fixed or get a new one.

if that is what was done, the element makes the heat. No element means no heat.

There is heat but worried about overload in the winter.

misswinter said "There is heat but worried about overload in the winter. "

If you are worried about overload in the winter call an electrician and get it fixed.

Most have multiple elements triggered to go on by the sequencers at slightly different times. You should hardly notice the difference. In saying that the furnace still should be re looked at and fixed for optimum performance.

My guess is that the element he disconnected either burned out and drooped on to the next element or on to a metal part of the furnace, causing a short or overload. In either case, it would pull way more than it's rated current and could trip the breaker. I would replace the disconnect element with one of equal wattage if you can still get one. If not, even a bit smaller wattage element should work. Not bigger.  
 
If your furnace had four elements, it may still produce enough heat with just three, but it will probably have to run longer to maintain the temperature setting.

Get a heating cooling guy to look at it. They are trained in figuring out heating loads required for your house and the capacity of air going through the duct work. If you do have disconnected elements they could fix it or be able to help you decide if the new capabilities could keep up in your house with its size and heat loss.  
 
I have a 27 kilowatt furnace but have disconnected elements so it runs on 18. I just needed a bigger blower for the length of runs in my house over the amount of heat produced.

disconnected an element then it must have been shorting and causing the breaker to trip. You should talk to him because he is likely planning on coming back with a replacement, and they are quite easy to change. As for can you run it without? Absolutely, just means the air won't be as hot so it'll take a bit longer to heat your place up. Its not an issue, unless you have more elements fail. Either way, I would make sure you get it replaced sooner than later