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Sensor Type
Door / Window
Contact Closure / Relay
Outdoor Rated
Normal State
Normally Closed
Ease of Installation
Beginner (Installs < 10 minutes)
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The Basic Sensor Of Any Alarm System!
SECO-LARM SM-200Q/WH Surface Mount Magnetic Contact Switch, Normally Closed
SECO-LARM Enforcer SM-200Q/WH Surface Mount Magnetic Contact Switch, Normally Closed
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Click for Larger Diagram Contact Dimensions Contacts installed on a window
SECO-LARM Enforcer SM-200Q/WH Surface Mount Magnetic Contact Switch, Normally Closed
Item# 7113
Price: Normally $2.99 
Hot Deal $2.02
Free shipping on orders over $175 - See Details


  • Use on normally closed (N/C) circuit systems
  • UL Listed for security systems
  • Use on doors, windows, and sliding doors
  • 3/4 inch Operation gap

Essential Info

The most basic sensor of any alarm system is a door and window Surface Mount Magnetic Contact Switch. This type of contact switch is for normally closed (N/C) circuits meaning that when the magnets are lined up, the switch is closed. This type of setup is ideal for monitoring doors, windows, and sliding doors. Measuring 2.48 inches long and 1/2 inch high, the contacts attach with wood or sheet metal screws (not included) to the frame of the door or window, and the case or jam.

A Normally Open Surface Mount Magnetic Contact Switch is also available individually and in a 10-Pack.


What's Included

  • 1x - SM200WH N/C Magnetic Contact Switch For Closed Circuit Systems
  • More Info

    The switch is waterproof and mounted in a high-impact plastic case. The rhodium plated contacts handle up to 100mA at 100 Volts DC and are rated for 50 million openings and closings. It can reliably operate in temperatures between -15°F and 160°F. The sensor's maximum operational gap is 3/4 inches. Mount the magnet on the door or window so that the two are in contact with each other when the door or window is closed. Slotted mounting holes make it easy to adjust the distance between the magnet and the sensor.



    Manufacturer Product No.:SM-200Q/WH
    Weight:0.05 pounds
    Dimensions:2.48 inches x 0.5 inches
    Compatibility:Closed circuit systems

    Important notes:
    Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.
    Manufacturer contact information: SECO-LARM USA Inc, Tel: (949) 261-2999


    Click for Larger Diagram  Contact Dimensions  Contacts installed on a window   
    Click for Larger Diagram  Contact Dimensions  Contacts installed on a window   


    192 Ratings
    5 star: 78%  (150)
    4 star: 12%  (23)
    3 star: 6%  (12)
    2 star: 3%  (6)
    1 star: 1%  (1)
    Average Customer Rating
    (192 customer ratings)
    Share your thoughts with other customers
    THOMAS A. -- milwaukee, WI   6/12/2014
    LARRY -- north port, FL   3/27/2014
    The work as advertised. Nice terminal cover included.
    DENNIS -- miami, FL   2/20/2014
    Excellent product, great service, quick delivery...will definitely use you again and refer you to friends, Thanks
    WILLIAM -- palmetto bay, FL   1/12/2014
    Products are good, everything is working properly.
    MICHAEL -- leduc, AB   11/27/2013
    This didn't work for me. I don't know is this is only some products. I was try use that for everspring z-wave door/windows sensor. I try different magnetic contact it was skylink products(old security system) it work well
    ROSE H -- sullivan, ME   7/14/2013
    These are, by far, the best sensors available. they are heavier than the ones provided by the alarm maker. and at a more than reasonable price!
    DAVID -- west chazy, NY   7/8/2013
    I ordered normally closed switches, figuring that the magnet would open them when the door is closed. Should have ordered NO I guess, confusion on this end, looks like. The switches are good.
    RICHARD -- ormond beach, FL   5/9/2013
    too large
    MIKE -- pittsburg, KS   11/23/2012
    Put these in a couple of my stores door security alarms and they seem to be working fine now. Only been in about 2 weeks but it was what I thought it would be.
    FRED -- colorado springs, CO   10/27/2012
    I purchased these to go with the INSTEON contact closure interface to monitor and control my garage doors. There is no mounting hardware or brackets included with these units, but I knew that from the get-go. I fabricated my own brackets to mount on the top of the garage door out of plexiglas purchased at the Home Depot and cut down and made into a right angled bracket (formed with a heat gun) for the magnet. On my doors the sensor had to be mounted about 3" above the door when closed in order for the door to clear the sensor while the door opened and moved away from the door frame. The fabricated bracket attached to the top of the door such that it was within an inch of the sensor with the door closed. That works fine. Since I have 3 bays, I also had to add a 3 outlet box to accommodate the 3 contact closure interfaces. You need lots of #20-22 gauge dual conductor wire for connections, but I was able to locate that in a local surplus store very cheaply.
    AL -- wilmington, OH   6/29/2012
    Great produce & service.
    ANDREY -- redmond, WA   5/23/2012
    works the way it should
    TROY -- lehi, UT   4/13/2012
    Great price
    CHESTER -- cincinnati, OH   3/19/2012
    I works very well.
    DEAN -- washington, DC   3/15/2012
    Worked great. The Original description of the matching of the switches with the control unit lead to me having to order two different types of switches.
    JAMES -- georgetown, IL   1/1/2012
    Shipped fast switches are good quality and good price.
    EUGENE R -- north scituate, RI   12/2/2011
    The contact switches came in expeditiously and work fine.
    RALPH -- bartlett, TN   11/26/2011
    just what I needed, and in itme.
    EUGENE R -- north scituate, RI   11/17/2011
    The products came in expeditiously and worked well.
    ROBERT -- taylors, SC   11/10/2011
    Easy to install and delivered on time.

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