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Standex Detect is the new name for our precision reed switches, sensors, and relays business.

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MK21 Series Reed Sensor

The MK21 Series is a rugged, rectangular reed sensor designed for screw-fastened flange mounting, offering reliable magnetic sensing in industrial, automotive, security, and appliance environments. Available in two variants—MK21P and MK21M—this series supports high-temperature resistance, custom cable configurations, and multiple switch options for versatile application needs.

The MK21 Series delivers robust performance and environmental resilience, making it a trusted solution for OEMs and engineers working in high-temperature or harsh industrial settings.

  • Rectangular flange-mount housing with cable terminals
  • MK21M variant supports high-temperature environments up to +150°C
  • UL-approved and IP67-rated for durability
  • Customizable switch type, cable length, and termination
  • Right-side cable exit available (MK21PR variant)
Contact Form1A (SPST) Normally Open (N.O.), 1B (SPST) Normally Closed (N.C.), 1C (SPDT) Changeover
Operating Range10-60 AT
Rated Power Max.10W/500VDC/0.5A
  • Automotive systems
  • Industrial automation
  • Security and access control
  • White goods and appliances
  • Position, level, and end-limit sensing

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