It carries a fixed 63 A thermal-magnetic trip unit (TM210) with overload protection set at Ir = 63 A and fixed short-circuit protection at Ii = 10 x In — meaning the magnetic trip fires at 630 A, a standard ratio for general-purpose feeder and branch-circuit protection.
The fixed Ir = 63 A matches a 63 A bus or cable rating; because it is non-adjustable, the BOM line is locked and cannot be accidentally re-rated during commissioning. The integrated undervoltage release (UVR) at 24 V DC drops the breaker when control voltage is lost — a standard requirement for safety circuits that need a guaranteed off-state on power loss.
Where it goes in the panel
The nut keeper kit (included) holds the terminal nuts captive during wiring — a small thing that saves time when an electrician is torquing down lugs in a tight enclosure. The UVR coil draws continuous power when the breaker is closed; plan the 24 V DC supply to hold it without dropping below the dropout threshold, especially on long cable runs.