It carries a 16 A rating at 40 °C through 55 °C, then derates to 15 A at 60 °C through 70 °C — so in a hot enclosure you lose an amp, but it holds steady across the typical panel ambient range. That means fixed thermal pickup and magnetic trip — no interchangeable trip units, no adjustment dials. It's set and forget, which is what you want for a straightforward feeder or branch circuit where coordination is already figured. Breaking capacity is the headline number: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V. At 240 V that's a serious fault-current rating — it'll clear a bolted fault on a big transformer secondary without the arc flashing over to the bus. The 415 V and 440 V numbers cover common industrial supply voltages in North America and Europe.
Dimensions: 130 mm tall, 101.6 mm wide, 70 mm deep — that's a 4-inch wide footprint, so it takes the same slot as other 4-pole SENTRON 3VA frames. Keep it inside a cabinet. Power loss maxes at 10.6 W — negligible for panel heat budgeting unless you stack a dozen of them in a sealed box.
This is a plain-vanilla thermal-magnetic breaker — line in, line out, it clears overcurrents.