The MK24-A-3 Reed Sensor is an ultra miniature surface mount, Form A, Single Pole, Single Throw, Normally Open (SPDT-NO), switch rated at 23 to 55 AT. The 5mm miniature J-lead SMD MK24-A-3 Series Reed Sensor is used in On/Off control switch, position, proximity, and motion applications. Supplied tape and reel, with 7 inch plastic reels and 16mm wide tape according to IEC 286/part 3.