MSS–89SL Surface Mount Contact

MSS 'Standard' Series | <strong>UL SECURITY LISTED</strong>

   Universal mounting

   Cost competitive


The MSS SERIES is resistant to:




Model MSS-89SL  |  Surface Mount Contact Open Loop

Model MSS-88SL  |  Surface Mount Contact Closed Loop

The MAGNASPHERE MSS line of security sensors provides a solution to all of the weaknesses and flaws of the reed switch contacts. The unique Magnasphere BMS switch utilized in these devices renders the MSS products virtually unbreakable, and highly resistant to permanent contact welding and outside magnet defeat. The MSS Series is UL, ULC listed and CE certified.


  • Made with MAGNASPHERE® Switch Technology
  • Won’t break
  • Resistant to contact welding
  • Resistant to outside defeat
  • Universal mounting
  • Cost competitive
  • Increase RMR
  • UL and ULC listed, CE Certified
  • Available with EOL Resisters Contact Factory
  • Made in America


Size: 4″L x 1/2″W x 1/2″H]
[100 mm L x 13 mm W x 13 mm H]
Max Gap: 1/2″ [12.7 mm]
Colors: Brown, Grey and White
Max Current:   0.25A Resistive
Max Voltage:   30 VDC
Max Power:    .25 W Resistive
Configuration:    Open Loop or Closed Loop w/ Target Magnet in Place
12″ Jacketed Leads
Wiring Schematics / Part No.

Wiring schematics for the following part numbers are available on the Downloads page in this section:
  • MSS–89SL
  • MSS–88SL

MSS–89/88SL Surface Mount Contact 4″ x 1/2″ x 1/2″



MAGNASPHERE products are covered by U.S. and International Patents. Click to review each patent at the USPTO Patent Full-Text and Image Database.

US Patents