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Littelfuse reed sensor needs no accessories to install

23 Mar 2016  | Susan Nordyk

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Fitted with retaining ribs on its cylindrical capsule, the 59040 Firecracker reed sensor from Littelfuse is easy to install. The ribs compress once inserted into a 0.375in (9.5mm) diametre hole, installing the sensor securely without screws, brackets or glue.

59040 sensor

Magnetically operated, the 59040 series offers a choice of three contact options: normally open, normally closed, and change-over. Switching capability is rated at up to 200 VDC/140 VAC at 10 W/VA. In addition, a range of sensitivity and cable length options is available. Hermetically sealed reed contacts endure millions of operating cycles under microcontroller voltage and current logic-level loads.

The 59040 sensor, which is 1.22in (31.0mm) long, mounts on a fixed surface or frame, while its matching 57040 magnet actuator mounts on the opposing moving surface or door. Typical applications include position sensing in appliances, door and window position sensing in security systems, limit sensing in hydraulic cylinders, and speed and distance measuring/sensing in treadmills and bicycles. The 59040 sensor is particularly useful for battery-powered applications, since the contacts do not draw power when activated.

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