The Siemens 5SL6401-7CC is a 4-pole miniature circuit breaker rated 1 A with a C-trip characteristic, breaking capacity of 6 kA at 400 V. It's part of the Basic Devices family and carries a Group Code of P310 (Product Group 3820).
Four poles let it switch all three phases plus neutral in a single unit, which simplifies wiring in a 3-phase panel.
The 1 A rating and C-curve make it a fit for protecting small loads like a single lighting circuit, a control transformer primary, or a PLC power supply feed where you want branch-circuit overcurrent protection, not motor starting.