It is part of the SIRIUS family, a modular system for motor control in industrial panels.
The 100 kA breaking capacity at 400 V is the headline number: this breaker can safely interrupt a fault current up to 100,000 A at 400 V AC without welding contacts or rupturing the enclosure. That is a high-interrupting rating for a 45 mm wide device, meaning it can be used at the service entrance of a panel with high available fault current — no need for a separate current-limiting fuse upstream in many installations. The rated insulation voltage spans 20 to 690 V, covering most low-voltage motor circuits worldwide.
Depth is 75 mm, height 90 mm. Clearance requirements: 20 mm upward, 20 mm downward, 9 mm to the side, zero forward or backward clearance needed. That means it can be mounted flush against the back panel and side walls — useful when packing breakers into a tight enclosure.