AF16 contactors are used to control power circuits up to 690 v AC and 220 v dc. are mainly used to control three-phase motors, non-inductive or slightly inductive loads. af contactors include an electronic coil interface that accepts a wide control voltage uc min. uc max. Only four coils cover control voltages between 24 and 500 v 50/60 hz or 20 and 500 v dc. AF contactors can handle large variations of control voltage. One coil can be used for different control voltages used worldwide without any coil changes. AF contactors have built-in surge protection and do not require additional surge suppressors. af series 1 stack tripolar contactors have a block design. - main poles and auxiliary contact blocks: 3 main poles, 1 built-in auxiliary contact. additional front and side mount auxiliary contact blocks (mechanically linked auxiliary contacts complying with Annex l of iec 60947-5-1. nc mirror contacts complying with Annex f of iec 60947-4-1) - control circuit: AC or DC operation - accessories: a wide range of accessories is available.