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Control stations

EDSX, EDS and EFD Explosionproof Snap Switches

New EDSX series available with NEMA 4X protection for Class I, Division 2 hazardous areas.

EDS/EDSX and EFD snap switches are used with magnetic starters or contactors for control of motors.  Snap switch control stations are factory sealed to prevent arcing of the enclosed device from causing ignition of a hazardous atmosphere external to the enclosure.  Factory sealing eliminates the need for external seals, simplifying installation and reducing material and labor costs.

Certifications and compliances

  • Class I, Divisions 1 & 2, Groups B*, C, D
  • Class II, Division 1, Groups E, F, G
  • Class II, Division 2, Groups F, G
  • Class III
  • UL standard: UL1203
  • CSA standard: C22.2 No. 30
  • NEMA/EEMAC 3, 7B*CD, 9EFG, 12

*Single-gang – 1P, 2P, 3W, 4W (20A): Factory sealed for Class I, Divisions 1 & 2, Groups B, C, D – no seals required.  Single-gang – 1P (30A), 2P (30A), 3P (10A, 15A), 3W (30A): Class I, Division 1, Groups C, D and Class I, Division 2, Groups B, C, D – seal within 18".  Class I, Division 1, Group B – add suffix GB and install seals within 1-1/2” of conduit openings for self-certification to UL standard.

Two-gang – 20A: Factory sealed for Class I, Division 1, Groups C, D and Class I, Division 2, Groups B, C, D – no seals required.  Class I, Division 1, Group B – add suffix GB suffix and install seals within 1-1/2” of conduit openings for self-certification to UL standard.  Two-gang – 30A: Class I, Division 1, Groups C, D and Class I, Division 2, Groups B, C, D – seal within 18".  Class I, Division 1, Group B – add suffix GB and install seals within 1-1/2” of conduit openings for self-certification to UL standard. 

Design features

  • Factory sealed devices eliminate external seals, reduce installation problems, lower installation costs and improve safety
  • Are used with general purpose snap and pushbutton type switches
  • Standard neoprene covers for front operated pushbuttons; prevents accumulation of dirt and entrance of water around operating shafts
  • Mounting lugs and taper tapped hubs with integral bushings
  • Large machine screws for fastening covers to bodies
  • Lockout provisions on front operated pushbutton (marked "STOP" and "OFF") and selector switch covers
  • Lockout hole for padlock having 1/4" hasp is provided when used with covers for front lever and side rocker type operation
  • Close tolerances in machining of wide, mating flanges and journalled shafts and bearings for front button operation, produces flametightness of enclosure joints
  • On enclosures with front lever and side rocker type operating handles, threaded type shafts and bushings are used to ensure flametightness
  • Dead end (EFS or EDS) or through feed (EFSC or EDSC) hubs – 1/2" to 1" sizes

Standard materials

  • Bodies and covers – Feraloy iron alloy (standard); copper-free aluminum (optional)
  • Shafts – stainless steel
  • Shaft bushings – stainless steel

Drawings and design support

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