It carries 100 kA Icu at 750 V DC (3P) per EN/IEC 60947-2, which means it can safely interrupt a 100 kA fault on a 750 V DC bus without welding or cascading. That's the kind of SCCR headroom you need for large DC drives, UPS battery banks, or solar combiner boxes where the prospective fault current is serious.
The breaking capacity is rated per IEC 60947-2 across multiple DC voltages: 100 kA Icu at 250 V DC 1P, 100 kA at 500 V DC 2P, and 100 kA at 750 V DC 3P. That's full-rated performance, not derated. The Ics (service breaking capacity) matches the Icu at each voltage level, so after clearing a fault the breaker can be reclosed without immediate replacement — important for uptime in a DC traction or industrial process line.
Fixed-mount on a backplate, 105 mm wide × 161 mm high × 86 mm deep. Front connections top and bottom, toggle control, IP40 front face with Class II shock protection — so it's fine in a ventilated enclosure but not for washdown. IK07 impact rating handles accidental tool drops during maintenance.