[Mageeacres]

I have an 1980 classic coach. #3 breaker

     These are Thin breakers with one upper and one lower circuit. So two breakers fit in the the regular slot protecting four circuits. My top circuit switch doesn’t energize anymore so it’s definitely a defective breaker. 
    Does anyone know what brand would have been supplied in 1979 in a coach classic?  
Or if these are still possible to get one? Or two? 
I’ll be removing the panel cover and removing the defective breaker. And posting photos… etc… etc… hopefully it will not be an obscure brand. If anyone has any information it would be helpful. Especially for the rear ac unit in need of a working circuit. Thanks in advance 
mike

[BusNit]

If you can post a pic, that would help. If I had to guess, you have a Square D QO tandem breaker that can be found at Home Depot. Non limiting style for around $90. Used to be $27 until the world changed three years ago.

[Mageeacres]

Thanks so much for the info

[Guy]

Thanks so much for the info

We have the same looking  breakers, and yes they were Square D, ( Now Schnieder) 20 amp twin space saving breakers, We had room to put in full space factor Square D breakers, as we were having nuisance tripping on really hot ambient temp days.