Press-Fit Reed Sensor requires no accessories for installation.

Press Release Summary:

Designed for mounting on fixed surface/frame with matching 57040 actuator mounted on moving surface/door, magnetically operated Firecracker 59040 Series features crush ribs on capsule and press-fits securely into 3/8 in. dia hole. NO, NC, and change-over contact options are available, and UL-Recognized component offers switching capability up to 200 Vdc/140 Vac at 10 W/VA. Various sensitivity and cable length options are available.

Original Press Release:

New Littelfuse Press-Fit Reed Sensor Requires No Accessories for Installation

Ideally suited for position and limit sensing in security systems, industrial equipment, and appliances

CHICAGO – Littelfuse, Inc., the global leader in circuit protection, has introduced the 59040 Series press-fit reed sensor, the first Firecracker reed sensor from Littelfuse with crush ribs on the capsule that requires no attachment accessories for installation. This magnetically operated sensor is designed to press-fit securely into a 3/8” (9.5mm) diameter hole and offers another sensor option for the competitive reed sensor market. Its enhanced sensitivity allows for a wider air-gap between the sensor and its matching 57040 actuator.

The 59040 Series sensor will be displayed among other Littelfuse products at China’s leading exhibition of electronic components, Electronica China, March 15-17, 2016, in Shanghai, in Booth No. 3522 (E3 Hall).

The sensor is designed for mounting on a fixed surface/frame with the magnet actuator mounted on the moving surface/door. It offers three contact options: normally open, normally closed, and change-over contacts. The 59040 Series press-fit reed sensor is a UL Recognized Component and offers switching capability up to 200VDC/140VAC at 10 W/VA. A range of sensitivity and cable length options are available.

Typical applications for the 59040 Series Firecracker reed sensor include position sensing in appliances, door/window position sensing in security systems; limit sensing in hydraulic cylinders; and speed and distance measuring/sensing for treadmills and bicycles.

“The new 59040 Series press-fit reed sensor is an ideal addition to our Firecracker reed sensor portfolio,” noted Will Li, sensors global product manager for Littelfuse. ”It offers designers a new sensor option in a popular form factor that’s quick and easy to install.”

The 59040 Series Firecracker reed sensor offers these key benefits:

Magnetically operated press-fit proximity sensor allows for quick and easy installation without the need for screws, brackets or glue.

Retaining ribs on the cylindrical capsule compress when inserted into a standard drill size 9.5mm (0.375 inch) diameter mounting hole to provide retaining force, allowing for secure installation.

It mounts in and operates through non-ferrous materials such as wood, plastic or aluminum.

Hermetically sealed reed contacts last for millions of operating cycles under microcontroller voltage and current logic-level loads.

Magnetically operated switch is ideal for battery-powered applications because the contacts do not draw power when not activated.

Non-contact switching solution is more aesthetically appealing than pushbutton or lever mechanical-type switches.


The 59040 Series Firecracker reed sensor is available in quantities of 100 pieces in a box with a minimum order quantity of 500 pieces. Sample requests can be placed through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit

For More Information

Additional information is available on the 59040 Series Firecracker reed sensor and 57040 magnetic actuator product pages. If you have technical questions, please contact: William Li, sensors global product manager,

About Littelfuse

Founded in 1927, Littelfuse is the world leader in circuit protection with growing global platforms in power control and sensing. The company serves global customers in the electronics, automotive and industrial markets with technologies including fuses, semiconductors, polymers, ceramics, relays and sensors. Littelfuse has nearly 9,000 employees in more than 35 locations throughout the Americas, Europe and Asia. For more information, please visit the Littelfuse website:


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