That level of SCCR (short-circuit current rating) is typical for industrial panelboards and motor control centers where the available fault current from the upstream transformer is high — it avoids cascading failure downstream and keeps arc-flash energy contained within the breaker's tested limits.
Deployment context
The 3-pole form factor occupies three module widths — plan your DIN rail layout accordingly, leaving finger-duct clearance for the outgoing cable terminations. The S800S series uses tunnel terminals accepting up to 35 mm² conductor, so torque the terminals to the value printed on the device face (typically 3.5 Nm) to avoid loose connections that generate heat.