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Conveyor belt control, alignment and signal switches

AFU and AFUX Explosionproof Conveyor Belt Control Switches

Crouse-Hinds series AFU and AFUX explosionproof conveyor belt control switches provide an emergency or normal "STOP" switch for conveyor lines, cranes, unloaders and bulk handling systems.  They are used in the control circuit of magnetic motor starters to shut down motor-driven conveyors or other machinery when switch is actuated.

Common applications include steel mills, mining, ore and coal handling operations, automotive and assembly lines, warehouses and loading docks.

Certifications and compliances

AFU:

NEC/CEC

  • Class II, Division 1, Groups E, F, G
  • Class II, Division 2, Groups F, G
  • Class III
  • Encl. 3, 5
  • NEMA 3, 4, 9EFG
  • IP66
  • UL standard: UL698
  • CSA standard: C22.2 No. 30

AFUX:

NEC

  • 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: UL698
  • cUL

Design features

  • Furnished with one or two end units, each containing 2-NO and 2-NC contact arrangements
  • Precision switches provide maintained contact (switches have a snap action mechanism)
  • Multiple conduit hubs (AFU: two 1"; AFUX: three 1"); cast mounting lugs on 1-1/2" centers permit attachment to the web of a standard 3" angle iron
  • In installation, the actuating line or cable is connected from a fixed point to the loop on the end unit; a pull on the line of the required operating force and with a total movement of 1/2" actuates the plunger, opens the switch and trips the red painted indicating arm forward, which locks the plunger in the actuated (switch open) position; returning the indicating arm to its normal position resets the mechanism; a typical installation would include single end switch units at each end of the conveyor with double end switch units between
  • Depending on the size and length of line, supports at properly spaced intervals may be necessary to ensure that the line or cable weight alone will not actuate switch

Standard materials

  • Enclosure – Feraloy iron alloy
  • Plunger – stainless steel
  • Loop – bronze
  • Indicating arm – steel
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