59156 Series - 59156 Subminiature Flange Mount Reed Sensor

External overview image
Roll Over to Zoom
Disclaimer Notice

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 59156 is a subminiature flange mounting reed sensor 12.70mm x 9.00mm x 3.00mm (0.500’’ x 0.354’’ x 0.118’’) with normally open contacts. The case design enables mounting with non-magnetic M2 screw at 0.1 Nm torque maximum or adhesive mounting. The wires exit from the left-hand side. It is also available with right-hand exit, see 59155 series. The 59156 is capable of switching up to 120Vac/170Vdc at 10VA.

It is well suited for use in a wide range of industrial, appliances, or IoT proximity sensing applications. The 59156 series functions best with the matching actuator 57155-000.

Features & Benefits:

  • Smallest flange mount type reed sensor in the market
  • 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
  • No leakage current in ‘open’ state−ideal for battery powered IoT applications
  • Can operate through non-ferrous materials (for example, wood, plastic or aluminum)
  • Helps implement efficient proximity/access and energy management systems
  • Easy installation and effective concealment in many applications
  • UL Recognized per UL 508 and CSA C22.2 No. 14
  • Hermetically sealed, IP67 rated; REACH compliant


  • Security and access control
  • Factory automation
  • Process equipment
  • Major appliances
  • Small appliances
  • Proximity and limit sensing

Access specifications, certifications, check availability and order parts below

Catalog #Switching Power (W)Switching Voltage (V DC)Switching Current (A DC)Switching Voltage (V AC)Switching Current (A AC)Breakdown Voltage (V DC)Max Contact Resistance (Ω)Magnetic Sensitivity (AT)Switch TypeMax Operate Time (ms)Max Release Time (ms)Operating TemperaturePartner ECAD ModelsStockSamplesCompare
59156-1-S-02-A101700.251200.181750.156 to 10B:SPST-NC0.50.2-40° to 105°C59156-1-S-02-ACheckOrder
59156-1-S-05-A101700.251200.181750.156 to 10A:SPST-NO0.50.2-40° to 105°C59156-1-S-05-ACheckOrder
59156-1-T-02-A101700.251200.181750.1510 to 15A:SPST-NO0.50.2-40° to 105°C59156-1-T-02-ACheckOrder
59156-1-T-05-A101700.251200.181750.1510 to 15A:SPST-NO0.50.2-40° to 105°C59156-1-T-05-ACheckOrder
To request product environmental information, please complete the Product Environmental Information Request Form.