SM-4201-LQ Track Mount Overhead Door Magnetic Contact 3 Inch Gap
The SM 4201 LQ track mount overhead door magnetic contact is designed for reliable door monitoring in industrial and residential applications. It fits door channel widths from 2 to 2.5 inches and features a 3 inch operating gap. A rugged aluminum housing, armored cable with 36 inch wire leads, and an iridium plated reed switch provide dependable performance, long service life, and consistent security monitoring in demanding environments.
- Three inch operating gap for overhead doors
- Fits track widths from 2 to 2.5 inches
- Rugged aluminum housing for durability
- Armored cable protects 36 inch wire leads
- Iridium plated reed switch supports long life
Designed for overhead door security applications in both industrial and residential environments with a wide 3" (76mm) operating gap.
Adjustable mounting design fits door track channel widths from 2" to 2-1/2" (51~64mm) for flexible installation.
Features a closed loop SPST magnetic contact that provides reliable door status monitoring for alarm and security systems.
Constructed with a rugged aluminum housing to withstand demanding daily use and harsh operating conditions.
Includes 36" (91cm) wire leads protected inside an armored cable for enhanced durability and tamper resistance.
Uses an iridium-plated reed switch with a high melting point and superior hardness for increased power handling and extended service life.
Supplied with mounting brackets for quick and secure installation on compatible overhead door tracks.
Compatible with an optional wide L-bracket (SM-8201-LWQ) for installations on door channels up to 4" (102mm) wide.
Also available in a version designed for wider 2-5/8" to 4" (66~101mm) door track channels to suit additional installation requirements.
Provides dependable magnetic contact performance for commercial warehouses, garages, loading docks, and residential overhead doors.
Built to deliver consistent long-term operation with durable materials that minimize maintenance requirements.
Backed by a lifetime limited warranty for added confidence and long-term product reliability.
| MODEL NAME | SM-4201-LQ Track-Mount Overhead Door Magnetic Contact |
| PRODUCT TYPE | Track-Mount Overhead Door Magnetic Contact |
| PART NUMBER | SM-4201-LQ |
| CONTACT TYPE | Magnetic reed switch |
| CIRCUIT TYPE | SPST Closed Loop |
| OPERATING GAP | 3" (76mm) |
| APPLICATION | Industrial and residential overhead doors |
| MOUNTING TYPE | Track mount |
| DOOR CHANNEL WIDTH | 2"~2-1/2" (51~64mm) |
| ADJUSTABLE MOUNTING | Yes |
| HOUSING MATERIAL | Rugged aluminum |
| WIRE LEAD LENGTH | 36" (91cm) |
| CABLE TYPE | Armored cable |
| SWITCH MATERIAL | Iridium-plated reed switch contacts |
| HIGH MELTING POINT CONTACTS | Yes |
| HIGH HARDNESS CONTACTS | Yes (Vickers hardness) |
| POWER HANDLING | Enhanced by iridium-plated contacts |
| EXPECTED SERVICE LIFE | Extended operational life |
| DOOR TYPE | Overhead door |
| INSTALLATION LOCATION | Door track |
| MOUNTING BRACKETS | Included |
| WARRANTY | Lifetime limited warranty |
| OPTIONAL ACCESSORY | SM-8201-LWQ Wide L-Bracket |
| OPTIONAL BRACKET APPLICATION | Door channels up to 4" (102mm) |
| COMPATIBLE WIDE MODEL | SM-4201-LWQ |
| WIDE MODEL CHANNEL WIDTH | 2-5/8"~4" (66~101mm) |
| WIDE MODEL CIRCUIT | SPST Closed Loop |
| CONTACT TECHNOLOGY | Magnetic reed switch sensing |
| SENSING METHOD | Magnetic contact |
| SECURITY APPLICATION | Door position monitoring |
| RESIDENTIAL USE | Yes |
| INDUSTRIAL USE | Yes |
| MATERIAL FINISH | Aluminum construction |
| CABLE PROTECTION | Armored |
| CONTACT DURABILITY | High durability |
| MECHANICAL STRENGTH | Rugged construction |
| INSTALLATION HARDWARE | Included |
| MONITORING FUNCTION | Door open/closed detection |
| SWITCH CONFIGURATION | Closed loop |
| MAGNETIC GAP | 76mm |
| CHANNEL COMPATIBILITY | Adjustable to multiple track widths |
| PRODUCT CATEGORY | Security Sensor |
| MANUFACTURER | SECO-LARM |
| ACCESSORY COMPATIBILITY | SM-8201-LWQ |
| RELATED MODEL | SM-4201-L3Q |
| RELATED MODEL | SM-4201-L6Q |
| OPERATING PRINCIPLE | Magnetic reed activation |
| INSTALLATION ENVIRONMENT | Indoor overhead door systems |
| PRODUCT PURPOSE | Perimeter security monitoring |
| TRACK WIDTH SUPPORT | 2" to 2-1/2" |
| EXTENDED TRACK SUPPORT | Up to 4" with optional bracket |
| LEAD PROTECTION | Armored flexible cable |
| SWITCH LIFE OPTIMIZATION | Iridium-plated contacts reduce wear |
| FEATURES | Adjustable mounting, rugged housing, armored cable, included brackets |
SM-4201-LQ Track-Mount Overhead Door Magnetic Contact from SECO-LARM is designed to provide dependable perimeter security for overhead garage and industrial doors. Featuring a 3" (76mm) operating gap and a closed loop (SPST) circuit, it delivers reliable door status monitoring in both residential and commercial applications. Its adjustable mounting design accommodates door track widths from 2" to 2-1/2" (51~64mm), making installation fast and versatile.
Built for Reliable Performance in Demanding Environments
Constructed with a rugged aluminum housing, the SM-4201-LQ is engineered for long-term durability in high-traffic installations. The contact features an iridium-plated reed switch with a high melting point and superior hardness for improved power handling and extended service life. A 36" (91cm) armored cable protects the wire leads from damage, ensuring dependable operation in industrial environments.
- 3" (76mm) operating gap for overhead doors
- Adjustable mounting for 2"~2-1/2" (51~64mm) track widths
- Closed loop (SPST) magnetic contact
- Rugged aluminum housing for long-lasting durability
- 36" armored cable protects wire leads
- Iridium-plated reed switch for enhanced reliability and longer life
Easy Installation for Residential and Commercial Security
The SM-4201-LQ includes mounting brackets for quick installation on overhead door tracks. It is ideal for use with alarm systems, access control systems, and commercial security installations requiring dependable door monitoring. For wider track applications, an optional SM-8201-LWQ Wide L-Bracket is available, along with compatible wide-track magnetic contact models.
- Residential garage overhead doors
- Commercial and industrial overhead doors
- Warehouse loading bays
- Access control and intrusion alarm systems
Security professionals can rely on the SECO-LARM SM-4201-LQ for dependable overhead door monitoring, rugged construction, and long service life. It is an ideal solution for commercial, industrial, and residential security installations requiring reliable magnetic door contacts.
Technical Specifications
- Model: SM-4201-LQ
- Type: Track-Mount Overhead Door Magnetic Contact
- Circuit: SPST Closed Loop
- Operating Gap: 3" (76mm)
- Compatible Track Width: 2"~2-1/2" (51~64mm)
- Housing Material: Rugged aluminum
- Wire Leads: 36" (91cm) armored cable
- Reed Switch: Iridium-plated for enhanced durability
- Included Accessories: Mounting brackets
- Optional Accessory: SM-8201-LWQ Wide L-Bracket (2-5/8"~4" track widths)
- Warranty: Limited lifetime warranty
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