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AFA and AFAX Explosionproof Conveyor Belt Alignment Switches

Crouse-Hinds series AFA and AFAX explosionproof conveyor belt alignment switches are used as an emergency or normal "STOP" switch for conveyor belts whenever they become misaligned or run off their tracks due to excessive speed, uneven load, leveling, breakage and/or other problems.

Ideal for safe and reliable use in hazardous areas within steel mills, mining, ore and coal handling operations, automotive and assembly lines, warehouses, loading docks, and grain loading and handling.

AFA and AFAX Explosionproof Conveyor Belt Alignment Switches

Certifications and compliances



  • Class II, Division 1, Groups E, F, G
  • Class II, Division 2, Groups F, G
  • Class III
  • NEMA 3, 4, 9EFG
  • IP66
  • UL standard: UL698
  • CSA standard: C22.2 No. 25



  • Class I, Divisions 1 & 2, Groups C, D
  • Class II, Division 1, Groups E, F, G
  • Class II, Division 2, Groups F, G
  • Class III
  • NEMA 3, 7CD, 9EFG
  • IP65
  • UL standard: UL1203
  • CSA standard: C22.2 No. 30

Design features

  • Furnished with precision switches that provide normally open and normally closed contacts (switches have a snap action mechanism)
  • Housing consists of a center section which can be mounted either vertically or horizontally, and a switch housing with an attached switch operating arm
  • Enclosure has three 1" conduit hubs; cast mounting lugs on 1-1/2" center permit attachment to the web of a standard 3" angle iron
  • Operating arm has 3-1/2" long stainless steel protective roller; approximately 3/4" lateral movement of operating arm actuates switch
  • Spring loaded operating arm will automatically return switch to normal position when belt interference is removed
  • A severe conveyor belt run-off can rotate the operating arm counter-clockwise up to 85 degrees without damage to the switch mechanism
  • Installation of AFA or AFAX unit on either side of a conveyor belt allows approximately 1" or a  pre-determined allowable belt misalignment before switch is actuated; a typical installation would include a pair of AFA or AFAX units at each end of the conveyor belt where belt returns

Standard materials

  • Enclosure – Feraloy iron alloy
  • Bearing and operating arm – stainless steel with plastic end caps
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