Lovato P1MBUH3PD32, Miniature Circuit Breaker, Thermal and Magnetic Trip Type, Three Pole (3P), 10kA, 3 Modules, D-Curve Characteristic, 32A, Rated Voltage 480Y/277VAC (UL 489)

These devices comply with the UL 489 standard, mostly used in the North American markets. They are designed to protect feeder circuits, the part of the system from the network supply point to the protection device for a branch circuit. 
They can also be used on the international market thanks to compliance with the IEC/EN/BS 60947-2 standard.
They have characteristics of tripping instantaneously defined as follows:
– C-curve: instantaneous trip 5...10 times In for inductive loads (mixed loads, resistive and inductive with low inrush current)
– D-curve: instantaneous trip 10...14 times In for highly inductive loads (loads with high inrush and current such as motors).