The undervoltage release (UVR) is built in, so the breaker trips if control voltage drops, which is standard for emergency-stop or safety-disconnect circuits where loss of pilot power must open the main contacts.
Interrupting capacity — the number that matters for fault duty
At 415 V it's still 121 kA; at 440 V, 75.6 kA. But for 240 V or 415 V distribution with high fault duty, the 187 kA / 121 kA numbers give you selectivity headroom without oversizing the enclosure.
Rated 80 A from 40 °C through 50 °C, then it starts stepping down: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, 74 A at 70 °C. The frame dimensions are 130 mm tall, 76.2 mm wide, 70 mm deep, so it fits a standard 3-pole MCCB footprint on DIN rail or direct-mount backplate. Power dissipation is 21.7 W max, which is moderate for an 80 A frame — plan for that heat in the enclosure thermal calculation.