LPS - Pre-Engineered Shunt Trip POWR-Switch Series - Pre-Engineered Shunt Trip POWR-Switch

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

Why are Class J fuses used instead of RK1?

The Littelfuse® LPS Series provides a simple and economical solution for applications that require selective coordination and shunt trip capabilities. Utilizes Class J time-delay fuses that are easily coordinated with other system overcurrent devices. The shunt trip capability allows the LPS Series to meet the ANSI/ASME standard that requires power to be automatically disconnected before water is turned on by the fire safety system.

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  • Elevator circuits
  • Data processing rooms
  • Building emergency systems


  • Pre-engineered single unit, which makes procurement easier than systems with multiple components
  • Reduces labor costs up to 66% and total installation costs by over 30%
  • Pre-installed UL listed Class J fuse holder – unique
  • Class J size eliminates the need for any rejection type fuse clips
  • Optional features offer flexibility for a variety of applications
  • Control power terminal block
  • UL Listed package
  • Cu and AI wire rated
  • Pre-wired control circuits lower installation time
  • Lockable operating handle meets all code and safety requirements (Accepts up to 3 locks)
  • Every unit is fully tested before delivery


  • Control power transformer with fuses and blocks
  • Fire safety interface relay
  • Key to test switch
  • Pilot light ”On”
  • Isolated neutral lug
  • Mechanical interlock auxiliary contact for hydraulic elevators with automatic recall (5 amp 120 Vac rated)
  • Fire alarm voltage monitoring relay
  • Option to bypass alarm when performing maintenance (-AZ option)
  • XPress-Ship™ service offers 48 Hours direct shipment service on select fully loaded LPS POWR-Switches
To request product environmental information, please complete the Product Environmental Information Request Form.