Cam switches Characteristics (p. 213) > 1 SPEED STARTER, 1 WAY - 3 PHASE MOTOR (continued) PR 40 - 50 A (AC21) 2-screw panel mount - interval: 50 mm Grey/black medium handle 72 aluminium plate and frame P= 18.5 kW in 400 V 8 contacts Y ∆ 0 Cat. No. Designation PR40 9551 B4 E Q72MN HZ51BQ7 HZ51BQ7 30 Ø80 72 Ø28 120 31 6 PR 40 - 50 A (AC21) Enclosure Cat. No. Grey/black medium handle 72 aluminium plate and frame P= 18.5 kW in 400 V 8 contacts HZ51BDQ 30 72 135 x 170 Ø28 145 6 31 180 Y 0 ∆ Designation PR40 9551 B4 BCF Q72MN HZ51BDQ