The 100 A rating is the continuous current it carries at 40 °C ambient; above that temperature the current must be derated — at 55 °C it handles 98 A, at 60 °C it handles 96 A, and at 70 °C it handles 91 A. The breaking capacity is 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. At 690 V the 7.5 kA rating is still substantial for most industrial loads. The 210 designation means the magnetic trip threshold is 10× the rated current, so 1000 A for this 100 A frame.
The dimensions are 130 mm high, 101.6 mm wide, and 70 mm deep — a 4-pole frame that fits standard 100 A MCCB panel cutouts. There is no undervoltage release fitted as standard, and no communication function, so it is a standalone electromechanical device.