Cam switches Characteristics (p. 213) > 1 SPEED STARTER, 1 WAY - 3 PHASE MOTOR No. of contacts 1-2 0 Y X 3-4 L1 1 i X 1 3 X 2 4 5 7 5-6 X X 7-8 X X 9 - 10 11 - 12 6 8 X 9 11 X 10 12 13 - 14 X X 15 - 16 X X 13 15 14 16 PR 12 - 16 A (AC21) 4 W2 L2 12 L3 13 2 U1 W1 U2 V2 14 6 V1 15 11 2- screw panel mount - interval: 30 mm Grey/black small handle 48 aluminium plate and frame P= 4 kW in 400 V 8 contacts Y ∆ 0 Cat. No. Designation PR12 9551 B4 E Q48PN NZ51BQ1 NZ51BQ1 22 48 40 x 42 Ø28 66 6 26 PR 12 - 16 A (AC21) Cat. No. Enclosure Designation Black small handle 64 aluminium plate P= 4 kW in 400 V 8 contacts NZ51BXQ 22 120 x 96 Ø28 101 26 176 Y 0 ∆ PR12 9551 B4 BCQ3 NZ51BXQ