Rated current holds at 16 A from 40 °C up through 55 °C, then derates to 15 A at 60 °C and above — so in a crowded enclosure running hot, you lose 1 A of headroom. Interrupting capacity drops sharply with voltage: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, then 17 kA at both 500 V and 690 V. That 17 kA floor at 690 V is still adequate for most industrial 690 V systems, but verify your available fault current before committing the BOM line. The TM240 thermal-magnetic release (design of the overcurrent release) gives a fixed thermal pickup and magnetic trip — no interchangeable trip units, which simplifies ordering but locks you into that 16 A frame.
That 3-inch width (76.2 mm) is the standard 3-pole MCCB footprint for this SENTRON frame — it occupies three 25 mm DIN positions. No undervoltage release, no voltage trigger, no communication function — this is a straight line-protection breaker with no auxiliary electronics.