What this breaker is
The ABB 1SDA068343R0001 is a moulded case circuit breaker from the SACE Tmax XT family in the XT4 sub-type, built as a 3-pole fixed-front unit rated for power distribution. It carries the XT4H interruption class with a TMA thermal-magnetic release, sized to a 250 A frame. It sits in the line as a feeder / main breaker rather than a motor protector specifically — the rating block is built around 250 A uninterrupted current at 690 V AC or 500 V DC, with 1000 V insulation voltage and an 8 kV impulse withstand, so it accepts the standard IEC industrial bus environment up to 690 V without extra clearancing work. Thermal-magnetic trip means the long-time element handles sustained overloads and the magnetic element clears short circuits — a familiar pattern for panel builders who want a single trip curve for cable and bus protection without a separate electronic trip unit.
Ratings that actually drive the fit
Per-pole loss is 16.44 W at rated operating conditions — the number the cabinet thermal balance hinges on. Three poles of that loss lands directly on the busbar heat-rise calculation when several breakers cluster in the same column. Mechanical durability is rated for 240 operations per hour and electrical durability for 120 operations per hour over 8000 cycles, so the breaker can take repeated switching duty on a feeder rather than being relegated to a one-shot main. Opening time with the shunt opening release is 15 ms, which matters where discrimination with downstream devices is engineered into the trip scheme. Terminals are fixed (F) on the front version, so the unit ships as a fixed breaker rather than a plug-in or draw-out cassette — busbar work and cabling land on the same stud pattern without an extra base.
Where the class is used
Moulded case breakers in the Tmax XT4 size class are the workhorse of low-voltage power distribution: main incomers and sub-feeders in motor control centres, building distribution boards, and machine main switches where 250 A frame capacity is the right step. The TMA release keeps the trip curve predictable on cable runs where short-circuit let-through needs to be coordinated with upstream protective devices.
Documents and compliance
The breaker is built to IEC standards. The published manual reference is 1SDH000722R0001, the technical data sheet is 1SDC210033D0204, and the environmental information sheet is 1SDL000190R0001 — these are the three documents a panel builder or QA pack pulls when assembling the declaration of conformity and the end-of-line test file.
Lifecycle and supply posture
Lifecycle stage for this order code is recorded as current, so the part is still on the active ABB line rather than on a last-time-buy clock. For an MRO spare or a panel-builder running a live BOM, that means it can be specified into the bill of materials against an RFQ without an immediate obsolescence contingency on this code.