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Use the SI-LM40xxx Series Safety Limit (Position) Switches to monitor the position of a guard to detect the movement, opening, or removal. A "guard" can be a gate, door, cover, panel, barrier or other physical means that separates an individual from a hazard. Safety switches will issue a signal to the machine control system to prevent or stop (halt) hazardous situations when the guard is not in the proper position. These Safety switches are designed for non-locking guarding applications, unless another means of locking is provided.

Banner SI-LM40 Series Limit Switch Style Machine Switches with Flexible In-Line Trumpet Actuator Distributor

SI-LM40xxx Series

The SI-LM40xxx Series Safety Limit (Position) Switches are considered a Type 1 interlocking device per ISO 14119 that are mechanically actuated by an uncoded rotary or linear actuator (cam or "dog") typically mounted on or part of the guard. A variety of actuating systems are available: plunger (dome), roller plunger, spindle-mount lever roller, and lever.

A pass-through hazard is associated with applications where personnel may pass through a safeguard (which issues a stop command to remove the hazard), and then continues into the guarded area, such as in perimeter guarding. Subsequently, their presence is no longer detected, and the related danger becomes the unexpected start or restart of the machine while personnel are within the guarded area.

If you are looking for Banner SI-LM40xxx Series Switches, please call us on (800) 894 - 0412 or email us at we will do our best to help you find the Banner SI-LM40xxx safety limit switch that you are looking for at the most competitive prices possible. If you are searching for Banner SI-LM40xxx safety position switch technical information (data-sheets) please use the datasheets or product selection guide page links.


  • Limit-switch style (EN 50041 and Type 1 per ISO 14119) where actuating elements are integrated with the enclosure
  • Positive opening safety contacts (IEC 60947-5-1) (not dependent on springs)
  • Can be used for safety or non-safety interlocking and position monitoring
  • Choice of actuating systems: plunger, roller, spindle-mount lever, and lever styles
  • Actuator head rotatable in 90° increments
  • IP65 aluminum switch housing and cover
  • Protected Earth Terminal (IEC 60947-1) on all models
  • When properly interfaced or used with an appropriate controller, two switches monitoring an individual guard can achieve safety category 4, per ISO 13849-1 (EN 954-1)
  • Typical applications include monitoring sliding (laterally) gates and guards on machines and in safety fencing systems

All mounting hardware is supplied by the user. Fasteners must be of sufficient strength to guard against breakage. Use of permanent fasteners or locking hardware is recommended to prevent the loosening or displacement of the actuator and the switch body. The mounting holes in the switch body accept M5 screws.

Safety limit switches and their actuators (cams, dogs, etc.) must be mounted such that the position cannot be changed after installation/adjustment. Mount the switch securely on a solid, stationary surface that can accommodate the forces of actuator movement. The loosening of mounting hardware must be prevented (for example, lock washers, thread-locking compound). The use of slots should only be used for initial positioning. Pins, dowels, and splines can be used to prevent movement of the switch and the actuator (cam).

Our industrial factory automation supplies distributors warehouse in Boise, Idaho stocks some Banner Engineering products enabling us to further assist you in finding the correct SI-LM40xxx limit switch for your application in the Pacific Northwest USA.

We can proudly say that we carry more SI-LM40xxx position switch in stock than any other Banner Engineering distributors in the Pacific Northwest region.

Whether we have SI-LM40xxx safety limit switches in stock in Boise, Idaho or need to get them from Banner Engineering; Clearwater Tech can get SI-LM40xxx safety position switches to you fast and save money!

It will be very helpful if you have the SI-LM40xxx limit switches part numbers ready, then our sales representatives can provide you with a pricing and availability quote for SI-LM40xxx position switches that you are looking for in seconds.

If you do not have the part numbers for SI-LM40xxx series switches, our application engineers will be able to help you figure out the part numbers and get the price quote to you as soon as possible.

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