Resideo 7939WG-GY MPS20 Surface Mount Magnetic Contact with Terminals, 1-1/4" Gap, SPST, Gray
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Key Features
- Discreet, professional appearance with concealed end-of-line (EOL) resistor for clean installations and tamper-resistant aesthetics
- Fast surface-mount installation using screws or double-sided adhesive—reduces labor and downtime on retrofit and new-build projects
- Reliable perimeter protection with a SPST (Normally Closed) reed switch and a standard 1-1/4" (32 mm) activation gap for accurate door/window monitoring
- Supports multiple contacts wired in series on a single zone to simplify wiring and lower panel input requirements
- Built to perform in harsh environments with low-temperature operation down to -40°F, ideal for indoor and semi-protected outdoor openings
- Neutral gray finish blends into most commercial and residential settings for unobtrusive surveillance integration
Quick Specifications
- Product Model
- 7939WG
- Brand Name
- Resideo
- Product Name
- 7939WG Magnetic Contact
- Product Type
- Magnetic Contact
Explore the details
Product information
7939WG-GY
Overview
Protect doors and windows with a compact, dependable surface-mount sensor designed for professional security systems. The Resideo 7939WG-GY MPS20 surface mount magnetic contact delivers consistent, tamper-resistant monitoring for residential and commercial applications. Featuring a SPST (Normally Closed) reed switch and a standard 1-1/4" (32 mm) gap, this contact ensures accurate trip detection while the concealed end-of-line (EOL) resistor keeps wiring tidy and resistant to tampering. Surface-mount installation is flexible—use screws or double-sided adhesive to speed deployment, and wire multiple contacts in series on a single zone to reduce panel I/O and simplify system design. Rated to operate in extreme cold down to -40°F, the gray housing blends into door and window frames for unobtrusive protection. Ideal for perimeter security, alarm monitoring and integration with surveillance systems, the Resideo 7939WG-GY offers installers a reliable, low-cost sensor that improves overall system performance. Add this magnetic contact to your wired security and surveillance setup today to streamline installation and strengthen monitoring coverage.
Features
- Discreet, professional appearance with concealed end-of-line (EOL) resistor for clean installations and tamper-resistant aesthetics
- Fast surface-mount installation using screws or double-sided adhesive—reduces labor and downtime on retrofit and new-build projects
- Reliable perimeter protection with a SPST (Normally Closed) reed switch and a standard 1-1/4" (32 mm) activation gap for accurate door/window monitoring
- Supports multiple contacts wired in series on a single zone to simplify wiring and lower panel input requirements
- Built to perform in harsh environments with low-temperature operation down to -40°F, ideal for indoor and semi-protected outdoor openings
- Neutral gray finish blends into most commercial and residential settings for unobtrusive surveillance integration
| General Information | |
|---|---|
| Brand Name | Resideo |
| Manufacturer | Resideo |
| Product Name | 7939WG Magnetic Contact |
| Product Type | Magnetic Contact |
| Product Model | 7939WG |
| Application/Usage | Commercial, Residential |
| Packaged Quantity | 4 |
| Manufacturer Part Number | 7939WG-GY |
| Technical Information | |
| Contact Form | Form A |
| Connectivity Technology | Wired |
| Certifications | |
| RoHS Compliant | Not Evaluated |
| Certifications & Standards | UL |
| Environmental Conditions | |
| Minimum Operating Temperature | -40.0°F |
| Physical Characteristics | |
| Color | Grey |
| Width | 0.50" |
| Height | 0.50" |
| Power Description | |
| Power Source | DC Power |
| Input Current | 300.00mA |
| Input Voltage | 30V DC |
| Product Information | |
| Length | 2.50" |
| Mount Type | Surface Mount |
| Contact Type | NC (Normally Closed), SPST (Single Pole Single Throw) |
| Installation Type | Hybrid (DIY + Professional) |
| Warranty | |
| Limited Warranty | Not provided |
| Miscellaneous | |
| Features | Ideal for residential or commercial use, Standard gap: 1-1/4 in (32mm) |
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- SKU:
- 7939WG-GY
- Manufacturer part:
- 7939WG-GY
How do I confirm compatibility?
Check the specifications and manufacturer documents for your existing system. Send us your model numbers and project requirements if you need help selecting equipment or accessories.
Ask a product specialistWhen will this item ship?
Availability is shown above. Special-order items and project quantities may need additional lead time. Contact us to confirm a delivery date before scheduling installation.
Shipping, freight and delivery detailsWhat should I know about returns?
Returns require an approved RMA. Consult the linked return policy for deadlines and eligibility. For standard non-defective returns, eligible factory-sealed items carry a 15% restocking fee and customer-paid return shipping; open-box and used items are refused. Defective and DOA claims follow the policy's separate terms. Special orders and other exclusions are final sale.
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Resideo 7939WG-GY MPS20 Surface Mount Magnetic Contact with Terminals, 1-1/4" Gap, SPST, Gray
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