LCN SEM7840 Heavy Duty Door Holding Magnet with 35 Pound Holding Force and Tri-Voltage DesignProfessional Fire Safety Door Control SolutionThe LCN SEM7840 is a low-profile recessed wall-mounted door holding magnet from the Sentronic 7800 Series, engineered for fire safety applications. This heavy-duty magnet provides 35 pounds of holding force through tri-voltage design (12V/24V/120V) and releases automatically when fire alarm panels enter alarm condition. UL listed for metal smoke barrier or labeled fire doors and certified under ANSI/BHMA A156.15, the SEM7840 features die-cast housing construction with powder coat finish for long-term durability in commercial applications.Professional Features & BenefitsHeavy-Duty Holding Force: Tri-voltage design delivers 35 pounds of holding force for secure door positioning in fire safety applications.Fail-Safe Operation: Magnet holds door until electrical current is interrupted, then releases automatically to allow manual door operation during alarm conditions.Tri-Voltage Compatibility: 12V/24V/120V operation provides flexible power supply options for various system requirements.Low-Profile Recessed Design: Wall-recessed mounting with 6-3/4" projection provides clean installation appearance while maintaining full functionality for pocket door applications.Die-Cast Housing Construction: Heavy-duty die-cast housing with powder coat finish ensures long-term durability in demanding commercial environments.Fire Safety Compliance: UL listed for metal smoke barrier or labeled fire doors and meets ANSI/BHMA A156.15 standards for code compliance.Versatile Installation Options: Suitable for pocket door installations with wood and machine screw pack fasteners included, armature extensions available.Manufacturer Warranty: Protected by 2-year warranty for added confidence and protection.Technical SpecificationsADA Compliant: YesBAA Qualified: YesCommercial/Residential: CommercialDepartment: Door HardwareDoor Type: Interior DoorElectronic: YesFinish Type: Powder CoatMounting Detail: Surface - Magnet Mounting Method: Wall MountProduct Category: Door ControlsProduct Group: Door ControlsProduct Model: SEM7840Product Projection: 6-3/4"Product Subgroup: Electromagnetic Door Holder / ReleasesProduct Type: Door MagnetsProduct Voltage: 12V/24V/120VSeries: SEM 7800 SeriesSubcategory: Fire and Life Safety ClosersWarranty: 2 YearProfessional ApplicationsCommercial Building Fire Safety SystemsHealthcare Facility Fire Door ControlEducational Institution Safety ComplianceIndustrial Facility Fire ProtectionMulti-Tenant Residential Fire SafetyGovernment Building Code ComplianceHospitality Fire Safety SystemsWhy Choose LCN Quality?LCN SEM7840 door holding magnets deliver professional-grade reliability with die-cast housing construction and UL listing for fire safety applications. Protected by a 2-year warranty and certified under ANSI/BHMA A156.15 standards for code compliance. Engineered for demanding commercial fire safety applications where dependable automatic release performance is essential.