GENERAL ELECTRIC TF136C5015 3POLES 15A, 600V CIRCUIT BREAKER [2ES3-4]

Molded-case / Feed-through style : The design is “molded-case” and apparently feed-thru. The “feed-thru” implies it is intended to carry current through its case to downstream load side (i.e., the load side is passed through the breaker) rather than just acting as a breaker for a branch.