Detex MS-2049SI Heavy Duty For...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$213.00
$193.34
Detex MS-2049SI Heavy Duty Form C Surface Mounted Magnetic Switch with Tamper Protection

Detex MS-2049SI Heavy Duty Form C Surface Mounted Magnetic Switch with Tamper Protection

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Model: MS-2049SI

In Stock (leaves warehouse same day if ordered before 3pm ET)

$213.00
$193.34
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Detex MS-2049SI Heavy Duty Form C Surface Mounted Magnetic Switch with Tamper Protection

Professional Door Surveillance and Alarm Triggering Solution

The Detex MS-2049SI Heavy Duty Form C Surface Mounted Magnetic Switch is engineered for commercial door surveillance applications, serving as a sensing device to detect door opening, trigger wall-mounted Detex Exit Alarms, and signal inadvertently opened doors. This heavy-duty magnetic switch features tamper protection with inaccessible mounting screws when the door is closed and potted components for shock and moisture protection. Rated for over one million operations under load, this switch provides reliable performance for demanding commercial security applications.

Professional Features & Benefits

  • Heavy-Duty Durability: Switch rated for over one million operations under load for long-term reliability in high-traffic commercial applications.
  • Tamper-Resistant Design: Mounting screws become inaccessible when door is closed, preventing unauthorized tampering or removal.
  • Environmental Protection: Components potted to protect against shock and moisture for reliable operation in various environmental conditions.
  • False Signal Reduction: Minimizes false signals due to loosely closed doors, ensuring accurate door status monitoring.
  • Versatile Alarm Integration: Serves as trigger for wall-mounted Detex Exit Alarms and can activate various audio and visual alarm systems.
  • Surveillance Assurance: Provides continuous assurance that protected doors remain under proper surveillance monitoring.
  • Form C Configuration: Heavy duty Form C contact arrangement for flexible switching applications and system integration.
  • Surface Mount Design: Surface mounted configuration specifically designed for in-swinging door applications.

Technical Specifications

  • Commercial/Residential: Commercial
  • Electronic: Yes
  • Product Category: Electronic Access Controls
  • Product Group: Electronic Access Controls
  • Product Model: MS-2049SI
  • Product Subgroup: Sensors, Switches, Relays and Timers
  • Product Type: Magnetic Switches
  • Series: MS-2000 Series
  • Subcategory: Magnetic Switch

Installation & Operation

  1. Verify electrical requirements match available power supply and confirm current capacity before proceeding with installation.
  2. Disconnect power supply before beginning installation. Follow all applicable electrical codes and safety procedures.
  3. Mount the unit on the door frame in the specified location ensuring adequate clearance for door operation and proper magnetic alignment.
  4. Route and connect wiring according to manufacturer wiring diagrams. Use appropriate wire gauge and connectors for the application.
  5. Configure operational settings and test magnetic alignment to ensure proper switch activation when door opens.
  6. Restore power and test all functions including normal operation, alarm triggering functions, and integration with connected surveillance or alarm systems.
  7. Complete final inspection and document settings. Refer to manufacturer documentation for complete wiring diagrams, programming instructions, and troubleshooting.

Professional Applications

  • Commercial Building Security Systems
  • Retail Loss Prevention
  • Healthcare Facility Access Control
  • Educational Institution Safety Systems
  • Industrial Facility Monitoring
  • Emergency Exit Compliance
  • Government and Municipal Buildings

Tamper-Resistant Design

The MS-2049SI features advanced tamper protection with mounting screws that become inaccessible when the door is closed, preventing unauthorized removal or tampering. This design ensures the magnetic switch remains securely in place and maintains continuous door surveillance integrity in commercial security applications.

Why Choose Detex Quality?

Detex MS-2000 Series magnetic switches deliver professional-grade reliability with potted components and heavy-duty construction rated for over one million operations under load. The tamper-resistant design and environmental protection ensure dependable performance in demanding commercial applications where continuous door surveillance is essential.



Installation Instruction (MS-2049F)
Installation Instruction (MS-2049S)
Installation Instruction (MS-2049SC
Installation Instruction (MS-2049SI)

Product Specs

Series:
MS-2000 Series
Product Group:
Electronic Access Controls
Product Subgroup:
Sensors, Switches, Relays and Timers
Product Type:
Magnetic Switches
Subcategory:
Magnetic Switch
Commercial/Residential:
Commercial
Electronic:
Yes
Product Model:
MS-2049SI
Product Category:
Electronic Access Controls
Department:
Door Hardware

Detex MS-2049SI – Frequently Asked Questions

1) Will the Detex MS-2049SI magnetic switch work on an out-swinging door?
No. The MS-2049SI is the surface mounted version built for in-swinging doors. On an out-swinging opening the switch body and magnet geometry won't line up, so you need a different MS-2049 variant for that condition.
2) Is the Detex MS-2049SI a Form C switch, and why does that matter for tying into an alarm panel?
It's a heavy duty Form C contact arrangement, meaning a single-pole double-throw contact with both normally open and normally closed terminals plus a common. That lets you wire it into a supervised alarm loop or a panel input that expects either polarity, rather than being locked to one contact state.
3) Can someone unscrew the MS-2049SI off the frame to defeat the alarm?
Not with the door closed. The mounting screws sit behind the door in the closed position, so they're inaccessible from the protected side. The internal components are also potted against shock and moisture, so there's nothing to pry at or short out.
4) What do I use to trigger a Detex wall mounted exit alarm from a door that has no exit device?
A magnetic switch like the Detex MS-2049SI does that job. It senses the door leaf moving away from the frame and sends the contact change to the wall mounted Detex exit alarm, so the alarm isn't dependent on a push bar or latch switch.
5) Is the MS-2049SI rated for a high traffic door like a stockroom or a hospital corridor?
Yes. The switch is rated for over one million operations under load, which is what puts it in the heavy duty class rather than a light residential reed contact. It's a commercial-duty part, and Detex lists it for retail loss prevention, healthcare access control, schools and industrial monitoring.
6) My door alarm keeps tripping when the door is not fully latched. Will this switch fix that?
That's exactly what the MS-2049SI is built to reduce. Its magnetic sensing is set up to minimize false signals from loosely closed doors, so a leaf that's seated but not tightly drawn still reads as closed. Correct magnetic alignment at install is what makes that work, so set the gap and test the switch before you sign off.
7) Does the MS-2049SI mount on the door or on the frame?
The switch body mounts on the door frame in the position called out on the instruction sheet, with the door leaf carrying the mating half. You need clearance for the door to swing and correct magnetic alignment at the closed position for the contact to change state reliably.
8) Which Detex installation sheet do I need for the MS-2049SI, and are the other MS-2049 sheets the same?
Use the MS-2049SI instruction sheet specifically. Detex publishes separate sheets for the 2049F, 2049S, 2049SC and 2049SI because the mounting and door swing differ between them, so the wiring and screw locations on the other sheets won't match the SI. All four are linked on the product record.
9) Is the MS-2049SI a lock or an access control device?
Neither. It's a sensing device only, a magnetic contact that reports whether the door is open or closed. It provides no security by itself and doesn't lock anything. Pair it with an alarm, a monitoring panel, or audio and visual annunciation to get a usable door surveillance point.
How fast can I get the Detex MS-2049SI delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Detex MS-2049SI come with a warranty?
Absolutely. The Detex MS-2049SI is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Detex MS-2049SI?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Detex MS-2049SI from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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