Are the (old) GE Type THQAL breakers allowed to be used in modern GE PowerMark Gold load centers?

What does the A stand for in the type designation? I noticed that it is for 60C wire. Is this the only difference from type THQL?

The load center is GE model TM3220CCU2K and it calls for the following breaker types: THQP, THQL, THQLAF, THQLGF, THHQL, THHQLAF, THHQGF, TQDL, THQDL, TXQL.

Could it be that GE do not mention type THQAL because it is no longer being made, but it would still be ok to use it in these newer load centers?

The breaker I have is THQAL21100 and it was used in an old GE load center as the main breaker. Would it be compatible with the modern GE tin plated copper bus?

Related question: Backfeeding a main breaker panel

  • 1
    Quick websearch isn't finding THQAL at all. There is probably a page somewhere on GE's site that enumerates the letter codes... At a wild guess, compatible with aluminum wire?
    – keshlam
    Commented Mar 17, 2023 at 14:48
  • 1
    Usually you can only use the listed breakers in a panel(some exceptions I think). There might be design changes between the old breaker and new panels. Probably the best people to ask is GE.
    – crip659
    Commented Mar 17, 2023 at 15:05
  • 1
    Is it a main breaker or does it go in branch circuit spaces? Commented Mar 17, 2023 at 18:08
  • 1
    If this is the same panel as in your other question should add a link to that question so people have an idea of what you are doing.
    – crip659
    Commented Mar 17, 2023 at 18:21
  • The breaker in question was a factory installed main breaker at the top of the panel. I want to use it on a different panel as a backfed breaker, so it will go in branch circuit spaces.
    – mcu
    Commented Mar 17, 2023 at 18:36

1 Answer 1


I contacted ABB (who now make GE breakers) and this is the reply:

Not sure what the " A" stood for, but since the THQL replaced the THQAL, should work.

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