The Schneider Electric C11B6TM016B is a ComPacT NSXm circuit breaker from the ComPacT range, rated 16 A at 40 °C with a 4-pole configuration and a 25 kA breaking capacity at 415 V AC. It uses a thermal-magnetic TM-D trip unit and is built for distribution applications in commercial and industrial panels. The IP40 enclosure and IK07 impact resistance handle typical panel environments — no washdown rating here, so keep it inside the enclosure.
That's the number to match against your load's full-load amps — not the 25 kA interrupting rating, which is the fault current it can safely clear. Overvoltage category III applies to fixed-installation distribution boards, so it's suited for permanent connection to the supply mains.
Mounts on a backplate, not a DIN rail — that's a key difference from the smaller DIN-rail breakers. It sits flat on the backplate, horizontal or vertical, and takes up 12 module pitches of 9 mm (108 mm width total). Connection pitch is 35 mm with spreaders, 27 mm without. The toggle handle gives manual on/off control, and a green flag signals when auxiliary contacts are present. No earth-leakage protection built in — that's a separate module if you need it.