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SI Series

Safety Limit Switches

SI Series safety limit switches combine switch and actuator in one device that mounts directly to a machine. The switch is actuated by the presence or movement of a mechanical machine guard and triggers an output when the guard reaches a user-defined switching point.

  • Four actuator types are available—lever, spindle-mount lever, plunger, and roller
  • Mechanically coded actuators use two independent operating elements to minimize intentional tampering or defeat
  • Rotating head and top or side engagement allows for eight different actuator positions
  • One-piece switch eliminates need for alignment, engagement and risk of breakage of a separate actuator
  • Design meets positive opening requirements for safety interlocks
  • IEC IP65 switch housing rating increases to IEC IP67 with addition of a screw to the wiring chamber door

Technical Literature

Date
Type
Size
SI-LM40 Safety Limit Switches
20 Apr 2015
Datasheet
768K
SI-LS83 Safety Limit Switches
11 Mar 2015
Datasheet
669K
SI-LS31 Safety Limit Switches
6 Mar 2015
Datasheet
946K

Marketing Literature

Date
Type
Size
Safety Switches
Safety Switches
6 Sep 2019
Product Brochure
1.7MB
Safety Solutions Brochure
8 May 2019
Product Brochure
10.9MB
Date
Type
Size
Safety Switches
Safety Switches
09/04/19
Product Brochure
1.9MB
Date
Type
Size
Machine Safety Catalog (14) - Limit Style Switches - Japanese
11/18/02
Catalog
746K

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Actuator (Safety) Contacts

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Actuation

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  1. SI-LM40PBD

    logo with r symbol

    Limit Switch: Metal Plunger Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 108 x 40 x 42 mm; Metal housing

  2. SI-LS83LE13D

    logo with r symbol

    Limit Switch: Plastic Lever Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 67 x 30 x 31 mm; Plastic housing

  3. SI-LS31PBF

    logo with r symbol

    Limit Switch: Plastic Plunger Actuator
    Contact Configuration: 2 NC/1 NO
    Dimensions: 74 x 31 x 31 mm; Plastic housing

  4. SI-LM40LA18E

    logo with r symbol

    Limit Switch: Plastic Spindle-Mount Lever Actuator
    Contact Configuration: 2 NC
    Dimensions: 108 x 40 x 42 mm; Metal housing

  5. SI-LM40LA18F

    logo with r symbol

    Limit Switch: Plastic Spindle-Mount Lever Actuator
    Contact Configuration: 2 NC/1 NO
    Dimensions: 108 x 40 x 42 mm; Plastic Housing

  6. SI-LM40LA18D

    logo with r symbol

    Limit Switch: Plastic Spindle-Mount Lever Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 108 x 40 x 42 mm; Plastic Housing

  7. SI-LM40PBE

    logo with r symbol

    Limit Switch: Metal Plunger Actuator
    Contact Configuration: 2 NC
    Dimensions: 108 x 40 x 42 mm; Metal housing

  8. SI-LS31LA18E

    logo with r symbol

    Limit Switch: Plastic Spindle-Mount Lever Actuator
    Contact Configuration: 2 NC
    Dimensions: 108 x 31 x 31 mm; Plastic Housing

  9. SI-LS31LE11E

    logo with r symbol

    Limit Swtich: Plastic Lever Actuator, 11 mm roller
    Contact Configuration: 2 NC
    Dimensions: 85 x 31 x 31 mm; Plastic Housing

  10. SI-LS31PBD

    logo with r symbol

    Limit Switch: Plastic Plunger Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 74 x 31 x 31 mm; Plastic housing

  11. SI-LS31PBE

    logo with r symbol

    Limit Switch: Plastic Plunger Actuator
    Contact Configuration: 2 NC
    Dimensions: 74 x 31 x 31 mm; Plastic housing

  12. SI-LS83LE13E

    logo with r symbol

    Limit Switch: Plastic Lever Actuator
    Contact Configuration: 2 NC
    Dimensions: 67 x 30 x 31 mm; Plastic housing

  13. SI-LM40L20D

    logo with r symbol

    Limit Switch: Plastic Lever Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 115 x 40 x 42 mm; Metal housing

  14. SI-LM40L20E

    logo with r symbol

    Limit Switch: Plastic Lever Actuator
    Contact Configuration: 2 NC
    Dimensions: 115 x 40 x 42 mm; Metal housing

  15. SI-LM40RC18D

    logo with r symbol

    Limit Switch: Metal Roller Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 111 x 40 x 42 mm; Metal housing

  16. SI-LM40RC18F

    logo with r symbol

    Limit Switch: Metal Roller Actuator
    Contact Configuration: 2 NC/1 NO
    Dimensions: 111 x 40 x 42 mm; Metal housing

  17. SI-LS31L22D

    logo with r symbol

    Limit Swtich: Plastic Lever Actuator, 22 mm roller
    Contact Configuration: 1 NC/1 NO
    Dimensions: 95 x 31 x 31 mm; Plastic Housing

  18. SI-LS31L22E

    logo with r symbol

    Limit Swtich: Plastic Lever Actuator, 22 mm roller
    Contact Configuration: 2 NC
    Dimensions: 95 x 31 x 31 mm; Plastic Housing

  19. SI-LS31L22F

    logo with r symbol

    Limit Swtich: Plastic Lever Actuator, 22 mm roller
    Contact Configuration: 2 NC/1 NO
    Dimensions: 95 x 31 x 31 mm; Plastic Housing

  20. SI-LS31LA18D

    logo with r symbol

    Limit Switch: Plastic Spindle-Mount Lever Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 108 x 31 x 31 mm; Plastic Housing

  21. SI-LS83LA18D

    logo with r symbol

    Limit Switch: Plastic Spindle Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 68 x 30 x 27 mm; Plastic housing

  22. SI-LS83LA18E

    logo with r symbol

    Limit Switch: Plastic Spindle Actuator
    Contact Configuration: 2 NC
    Dimensions: 68 x 30 x 27 mm; Plastic housing

  23. SI-LS83RC10D

    logo with r symbol

    Limit Switch: Plastic Roller Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 63 x 30 x 27 mm; Plastic housing

  24. SI-LM40L20F

    logo with r symbol

    Limit Switch: Plastic Lever Actuator
    Contact Configuration: 2 NC/1 NO
    Dimensions: 115 x 40 x 42 mm; Metal housing

  25. SI-LM40PBF

    logo with r symbol

    Limit Switch: Metal Plunger Actuator
    Contact Configuration: 2 NC/1 NO
    Dimensions: 108 x 40 x 42 mm; Metal housing

  26. SI-LM40RC18E

    logo with r symbol

    Limit Switch: Metal Roller Actuator
    Contact Configuration: 2 NC
    Dimensions: 111 x 40 x 42 mm; Metal housing

  27. SI-LS31LA18F

    logo with r symbol

    Limit Switch: Plastic Spindle-Mount Lever Actuator
    Contact Configuration: 2 NC/1 NO
    Dimensions: 108 x 31 x 31 mm; Plastic Housing

  28. SI-LS31LE11D

    logo with r symbol

    Limit Swtich: Plastic Lever Actuator, 11 mm roller
    Contact Configuration: 1 NC/1 NO
    Dimensions: 85 x 31 x 31 mm; Plastic Housing

  29. SI-LS31LE11F

    logo with r symbol

    Limit Swtich: Plastic Lever Actuator, 11 mm roller
    Contact Configuration: 2 NC/1 NO
    Dimensions: 85 x 31 x 31 mm; Plastic Housing

  30. SI-LS31RC10D

    logo with r symbol

    Limit Switch: Plastic Roller Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 81 x 31 x 31 mm; Plastic housing

  31. SI-LS31RC10E

    logo with r symbol

    Limit Switch: Plastic Roller Actuator
    Contact Configuration: 2 NC
    Dimensions: 81 x 31 x 31 mm; Plastic housing

  32. SI-LS31RC10F

    logo with r symbol

    Limit Swtich: Plastic Roller Actuator
    Contact Configuration: 2 NC/1 NO
    Dimensions: 81 x 31 x 31 mm; Plastic Housing

  33. SI-LS83PBD

    logo with r symbol

    Limit Switch: Plastic Plunger Actuator
    Contact Configuration: 1 NC/1 NO
    Dimensions: 57 x 30 x 27 mm; Plastic housing

  34. SI-LS83PBE

    logo with r symbol

    Limit Switch: Plastic Plunger Actuator
    Contact Configuration: 2 NC
    Dimensions: 57 x 30 x 27 mm; Plastic housing

  35. SI-LS83RC10E

    logo with r symbol

    Limit Switch: Plastic Roller Actuator
    Contact Configuration: 2 NC
    Dimensions: 63 x 30 x 27 mm; Plastic housing