Four poles handle three-phase plus neutral switching. The interrupting ratings climb to 187 kA at 240 V and hold at 121 kA through 440 V, then step down to 75.6 kA at 500 V and 4.5 kA at 690 V — so the available fault current at the panelboard determines which voltage column governs selection.
Verify the mounting base and bus-bar spacing against the existing panel cutout before ordering; the 140 mm width is the key dimension for multi-pole grouping in a distribution board.
