MK20 Series cylindrical reed sensors are magnetically operated proximity devices designed to be mounted on virtually any fixed surface so that the actuating magnet is on the moving surface. Featuring three versions with 10-15, 15-20, and 20-25 AT magnetic sensitivity, these tiny sensors are suitable for a range of positioning, limiting, level sensing, and counting applications.

Potted inside a plastic case and supplied with a choice of cable and termination options, the sensors measure 0.118 in. OD and 0.335 in. long. They have a 5 W contact rating, 175 Vdc or Vac peak switching voltage, 0.25 A switching current, 0.5 A carry current, and 300 mω static contact resistance at 0.5 V and 10 mA. Typical uses include water level detection in appliances and industrial equipment.