These square D tandem circuit breakers were made for use as a spare in my house service station bought box. Couldn't find this 15 amp type at local Home Depot or Lowes stores. It appears to be an old style switch that isn't typically sold unless you go to an electrical wholesaler. The breakers originally installed in the outdoor distributor (or load center) appear to have worked after about twenty years and I ended up replacing two or three breakers. As other reviewers have pointed out, you need to make sure this type of switch fits your switch box.
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