The 1SDA068092R1: This is an ABB XT4N 250 TMA distribution circuit breaker, three-pole, rated for continuous current of 250 A (both In and Iu match that figure). It's meant for distribution panels where you need a fixed thermal-magnetic trip unit with a wide adjustment range — the TMA here goes 250 up to 2500 A on the magnetic setting, so it covers motor and feeder protection in one can.
Typical lead time runs 2–4 weeks through distribution. No LTB window or surplus-channel risk here.
Leave clearance for the rotary handle and for cable bending radius — the 16 cm height includes the terminals. TMA trip unit provides thermal-magnetic protection. Rated continuous current is 250 A.