59143-1-S-05-A - 59143 Series

Series: 59143
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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.


The 59143 is a miniature flange mounting reed sensor 23.00 mm x 14.00 mm x 6.00 mm (0.906” x 0.551” x 0.236”) with normally open contacts.The case design enables mounting with M3 screw with washer at 1 Nm torque maximum or adhesive mounting. The wires exit from the right-hand side. The 59143 is capable of switching up to 265Vac/300Vdc at 10VA. It is well suited for use in a wide range of industrial, appliances, or IoT proximity sensing applications. The 59143 series functions best with the matching actuator 57143-000, which is sold separately.

Features & Benefits:

  • Non-contact switching solution for wet & harsh environments
  • Housing design for optimum adjustability
  • Available in select sensitivities (operating distances)
  • Standard cable configurations; customization options available
  • Hermetically sealed, IP67 rated; UL and REACH compliant (TBD)
  • No leakage current in ‘open’ state−ideal for battery-powered IoT applications
  • Can operate through non-ferrous materials (for example, wood, plastic or aluminium)
  • Helps implement efficient proximity/access and energy management systems
  • Compact size and easy installation and effective concealment in many applications
  • UL Recognized per UL 508 and CSA C22.2 No.14. (TBD)


  • Security and access control
  • Factory automation
  • Process equipment
  • Major appliances
  • Small appliances
  • Proximity and limit sensing
To request product environmental information, please complete the Product Environmental Information Request Form.