250 A continuous, 690 V, 4-pole — the selectivity anchor
The 1SDA068106R1: Rated In and Iu both sit at 250 A, with a rated voltage of 690 V and 50/60 Hz.
TMA trip unit — fixed thermal-magnetic, InN=50%
The TMA trip unit is a fixed thermal-magnetic design — no interchangeable electronic trip modules, no adjustable I²t curves. The InN=50% marking on the type string indicates the neutral pole is rated at 50% of the phase current, which is standard for distribution MCCBs where the neutral carries only unbalanced load current, not full phase current.