The Schneider Electric A9GSB150 is a single-pole fuse-disconnector from the Acti9 SBI series, rated for 690 V AC and accepting fuse links sized 14 x 51 mm. The rated current range spans 10 A to 50 A, covering common branch-circuit protection needs.
The 690 V AC operational voltage (Ue) covers 400 V three-phase systems with headroom, so it works in most industrial and commercial panels. The fuse curve GG AM means the holder accepts both general-purpose (gG) and motor-protection (aM) fuse links — you pick the link to match the load, not a fixed device. Pollution degree 3 (industrial environment, conductive pollution) is standard for unsealed panel gear; no extra conformal coating needed inside a clean enclosure.
Screw-clamp terminals accept 1 to 16 mm² rigid or 1 to 10 mm² flexible cable; strip 10 mm and torque to 2.2 N·m top or bottom. The 26.5 mm width (three 9 mm pitches) means you can pack several units side-by-side in a standard 18-module distribution board.