At 690 V it still breaks 2 kA, so it handles fault clearing in mixed-voltage motor control centers. Built-in phase failure detection is a critical feature: if one supply phase drops, the breaker opens before single-phasing can cook the motor winding. No ground-fault detection on this variant, so pair it with a separate ground-fault relay if the installation requires it.
Width is 55 mm, depth 149 mm, height 140 mm. That side clearance is tight—useful when packing multiple breakers in a row on a DIN rail. Main circuit terminals are M6 screw-type, accepting 2x 1–35 mm² or 1x 1–50 mm² solid or stranded copper. Strip and torque per Siemens guidelines; the M6 size is common across the SIRIUS 3RV2 frame.