The Siemens 5SL6610-8CC is a 3+N-pole miniature circuit breaker rated 10 A at 400 V with a 6 kA breaking capacity, D-curve trip characteristic.
Group Code P310 and Product Group 3821 are Siemens internal classification fields — useful for cross-referencing against a panel builder's BOM or a legacy parts list, but they don't change the electrical fit. The unit is a single piece, Basic Devices family.
