Detex MS-2049 Heavy-Duty Form C Magnetic Door Switch | Flush, Surface, Conduit or Inswinging

Monitor the open/closed condition of compatible commercial doors using the Detex MS-2049 Heavy-Duty Magnetic Door Switch. This family of Form C / SPDT magnetic door contacts detects door movement and provides a dry-contact signal to approved exit alarms, access-control systems and remote monitoring equipment. Choose the correct factory mounting configuration: MS-2049F flush mount, MS-2049S standard surface mount, MS-2049SC surface mount with a thin-wall conduit connector, or MS-2049SI surface mount specifically for inswinging doors. Each uses manufacturer-specified color-coded leads, a 500mA at 24VDC maximum contact rating, and a compatible door-mounted magnet.

New MS-2049SC conduit-mount option: The Detex MS-2049SC is the surface-mounted contact configuration with a factory conduit connector intended for thin-wall electrical conduit. The magnet and its mounting bracket attach to the door; the switch/contact assembly, cover, conduit adapter and connector attach at the frame. This model is suited to installations where the contact lead must enter an approved conduit pathway, unlike the plain MS-2049S surface model. The connector is included, but a length of field-supplied conduit is not automatically included. Use Detex installation instructions INS-2049SC-3429 and verify conduit routing, bracket clearance and fastening.

MS-2049SI for inswinging doors: The new Detex MS-2049SI is the heavy-duty Form C magnetic switch designed for inward-opening commercial doors. Unlike the standard surface model, the SI contact and magnet use the factory inswing-specific surface mounting arrangement to suit an inswing door and frame. The sensor uses a Form C / SPDT dry contact, 12-inch color-coded concealed leads, and high-impact thermoplastic surface housing, with a maximum contact load of 500mA at 24VDC. Use the separate INS-2049SI-3430 installation instructions and verify actual swing, mounting clearances and contact alignment before ordering.

Important: The MS-2049 family consists of passive door-position switches. These products do not include an audible alarm, battery, power supply, electric lock or exit device. A compatible alarm or monitoring panel is required to process the Form C contact signal and provide any notification.

Compare the Available Mounting Styles

Which configuration to order: Choose F for recessed/flush installations, S for standard surface-mount wiring, SC when a thin-wall conduit connector is required, or SI when the monitored door is inswinging and requires Detex's dedicated surface-mount geometry. Do not substitute a different mounting model without reviewing the applicable door/frame template.

Key Features and Benefits

• Heavy-duty Detex OEM design: Commercial-door magnetic switch family designed to help detect unapproved opening, doors left ajar, or an open/closed door-position condition.
• Form C / SPDT output: Provides common, normally open and normally closed switching connections for suitable low-voltage monitoring inputs; wiring must follow the exact device contact diagram.
• Rated 24VDC at 0.5A: Detex documents a maximum dry-contact rating of 500 milliamps at 24 volts. This rating is for the switch contact and does not mean the sensor itself supplies 24VDC power.
• Color-coded 12-inch wire leads: Manufacturer standard leads for installation and wiring to approved security, exit-alarm and monitoring circuits.
• MS-2049SC conduit connector: A surface-mount connector and reversible adapter intended for thin-wall conduit. When locating the device near the latch side, permit adequate clearance for conduit; Detex notes the adapter can be reversed to bring conduit in from the hinge side.
• MS-2049SI inswinging option: Dedicated surface-mounted contact/magnet arrangement for inward-swinging commercial doors, with high-impact ABS protective housing. Designed for appropriate steel, aluminum and wood door/frame applications.
• Standard MS-2049S surface option: Contact and magnet assembly supplied with high-impact ABS protective covers for frame and door surface mounting, without the SC conduit entry configuration.
• MS-2049F concealed option: Contact recessed into a properly prepared frame and magnet mortised into the door edge for applications where surface housings are undesirable.
• Durability for active commercial doors: Potted switch components resist ordinary shock and moisture exposure under manufacturer-specified conditions; surface-mounted units use protective high-impact ABS housings.
• More than one million loaded cycles: Detex literature specifies more than one million switch operations under load.
• Tamper-resistant mounting: Mounting screws are not accessible while the door is properly closed, which reduces opportunities for unintended removal.
• Steel, aluminum or wood doors: Manufacturer-approved door/frame surfaces; consult Detex templates for stiles as narrow as 1-3/8 inches and applicable installation clearances.
• Compatible monitoring applications: Trigger a manufacturer-compatible Detex EAX-2500 exit alarm, remote status display, security-panel input or related door-monitoring arrangement after contact and wiring compatibility are confirmed.
• Fire-door accessory applications: MS-2049F, S and SC have been listed by Detex as UL-Classified Miscellaneous Fire Door Accessories; the installation must still meet the door assembly listing and permitted field preparations.
• Three-year limited manufacturer warranty: Subject to current Detex warranty terms and correct installation.

Technical Specifications

Commercial Applications

• Detex EAX-2500 and compatible exit-alarm systems requiring a door position input
• Warehouse, stockroom, retail, healthcare, education and office door-position monitoring
• Surface-mounted installations using thin-wall conduit for low-voltage security wiring (MS-2049SC)
• Monitoring of commercial inswinging doors requiring the model-specific MS-2049SI surface-mount arrangement
• Door monitoring in compatible listed fire-door openings with approved contact mounting
• Door-forced-open and held-open conditions reported through a separately supplied control panel

What's Included

One selected Detex MS-2049 factory switch assembly, the corresponding door magnet and required manufacturer-standard mounting components and 12-inch color-coded wire leads. MS-2049F is flush-mounted; MS-2049S includes the standard surface-contact and magnet housings; MS-2049SC includes the model-specific surface contact, protective housing, magnet/bracket, thin-wall conduit connector and reversible adapter. MS-2049SI supplies the inswing-specific surface magnetic contact and mating magnet assembly with standard factory hardware and 12-inch leads. Confirm replacement fasteners, exact mounting-bracket contents and all accessories against the current Detex packing list.

Sold Separately

Alarm or monitoring controller, Detex EAX-2500 or other exit alarm, security-panel power source, extension wiring, door and frame, any actual run of thin-wall electrical conduit for the SC connector, approved field conduit fittings not included with the switch, and installation labor. Field-supplied inswing-specific shims or specialty anchors not included by the factory should be purchased separately.

Shipping Information

MS-2049F flush mount: 0.75 lb (existing Shopify shipping weight). MS-2049S surface mount: 1.1 lb provisional retailer weight. MS-2049SC surface/conduit mount:1.5 lb Grainger-listed shipping weight for exact model. MS-2049SI inswinging surface mount: 1.1 lb provisional estimate based on comparable surface-mount unit (not a verified SI packaged shipping weight). Manufacturer-packed box dimensions have not been independently verified; compare distributor-packed weights and measurements with actual warehouse cartons before buying UPS labels.

Installation and Life-Safety Notes

Use the manufacturer's model-specific installation instructions: INS-2049F-3427 for F, INS-2049S-3428 for S, INS-2049SC-3429 for the conduit connector, or INS-2049SI-3430 for the inswinging model. The MS-2049SC is intended for thin-wall conduit and must allow adequate space for the connector. The MS-2049SI must be installed with the dedicated inswinging mounting template; do not assume S/SC mounting geometry is appropriate for inward-swinging doors. Detex notes that its adapter is reversible to bring conduit from the hinge-side if required. Keep the contact and magnet aligned so a door cannot open more than two inches without creating the expected signal to the connected alarm. The contact is rated 500mA at 24VDC maximum; do not connect high-current security loads directly. On fire-rated doors, verify the exact factory model's approval, particularly the SI variant, and use only permitted preparations consistent with the door listing and authority having jurisdiction. This component senses door status but does not independently lock, power, alarm or delay egress.