Four poles let it switch three-phase plus neutral, common in North American 120/208 V or European 230/400 V distribution where the neutral needs overcurrent protection.
The breaker holds its full 32 A rating from 40 °C up to 50 °C, then drops only 1 A per 5 °C step — 31 A at 55 °C, 30 A at 70 °C. That's a shallow derating curve, so a panel running warm (say 50 °C) still gets the full 32 A without needing to oversize. The 70 mm depth and 101.6 mm width fit standard 4-pole MCCB footprints; check your busbar or cable lug spacing before committing.
The interrupting rating drops as voltage rises: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, then a steep cliff to 17 kA at 500 V and 690 V. If your fault current at 480 V is above 17 kA, this breaker won't clear it safely — you'd need a higher-rated frame. Most commercial 480 V panels have available fault currents under 17 kA, but verify your transformer size and impedance before specifying.