The Siemens 5SL6610-7CC is a 3+N-pole miniature circuit breaker (MCB) rated at 400 V with a 6 kA breaking capacity, a C-trip curve, and a 10 A current rating. The 3+N-pole configuration gives you three protected phases plus a switched neutral that breaks simultaneously, which is common in three-phase panelboards where you want the neutral isolated when the breaker is off.
It's a single-piece unit (packaging quantity: 1). For current pricing and availability, submit an RFQ — the part is quoted to order through independent distribution, with confirmed pricing and lead time at quote time.