ABB A50-30-11-51 Three-Phase Industrial Contactor

ABB A50-30-11-51 is a 3-pole, AC-operated contactor in ABB’s A-Line designed to switch three-phase motors and power circuits up to 690 V AC. It features three main normally open contacts (3NO) and one auxiliary contact (NO/NC), with a 100 A rating and a motor-load capacity of about 22 kW in typical 400–600 V applications. The coil is rated for 480 VAC, suitable for 50/60 Hz control circuits, and the unit uses the block-type A-Line construction that supports add-on auxiliary contact blocks for front or side mounting. This model represents the 3P variant of the A50-30-11 family and is widely used in industrial automation to control heavy-duty motors and other three-phase loads.