It comes as a set of three fuses, without striker. The aM characteristic means it is sized to handle motor inrush without nuisance blowing while still clearing a bolted fault — the curve sits between a standard gG general-purpose and a full motor-start curve, so it is a common choice for motor branch-circuit protection where the upstream MCCB or switch-disconnect provides the short-circuit backup.
The NH000 form factor is the smallest of the NH blade sizes — 50 A is near the top of its rating band (NH000 typically covers 16 A to 100 A). The 690 V AC rating means it is suitable for 400 V and 690 V three-phase systems, which covers most European and IEC industrial networks. The aM curve is the key selection parameter: it is not a full-range fuse (it does not provide overload protection down to low overcurrents), so the circuit design must rely on the upstream protective device or the motor overload relay for sustained overloads. The DF2FGA50 is there for the short-circuit event, not the daily thermal trip.