What it is on the shelf
The ABB 1SAM340000R1012 is catalogued under Circuit Breakers, Fuses & Protection → Circuit Breakers → Molded Case Circuit Breakers, which puts it on the MCCB line rather than the miniature or supplementary-breaker rails — a buyer sourcing this code is looking at a frame-class assembly or a tight-fit element that bolts into one.
Spec ledger and sourcing posture
No functional rating — frame current, breaking capacity, pole count, trip curve — is carried in the available spec record, so any fit decision against an existing MCCB frame needs the datasheet line for this 1SAM3 suffix, not the order code alone.