Norton Rixson 993M Electromagnetic Door Holder with 275 lbs Holding Force and Switch

Norton Rixson 993M Electromagnetic Door Holder with 275 lbs Holding Force and Switch

High-Hold Wall Mounted Electromagnetic Door Control Solution

The Norton Rixson 993M electromagnetic door holder delivers professional-grade door control with 275 lbs holding force for heavy-duty commercial applications. This wall-mounted unit features 24VAC/DC operation with fail-safe power failure release and includes an integrated switch box measuring 4-1/2" x 4-9/16" x 2-1/2" deep. UL-cUL fire-rated up to 3 hours with adjustable armature rotation for precise alignment and consistent magnet contact.

Professional Features & Benefits

• High Holding Force: 275 lbs holding capacity provides secure door retention for heavy commercial doors and high-traffic applications.
• Adjustable Armature Design: Armature rotation adjusts up and down, back and forth for optimal alignment and consistent contact with magnet assembly.
• Fail-Safe Operation: Power failure automatically releases door to close, ensuring fire safety compliance and emergency egress functionality.
• Integrated Switch Box: Includes 4-1/2" x 4-9/16" x 2-1/2" deep switch box with test switch for operational verification and system integration.
• Flexible Power Options: 24VAC/DC voltage operation accommodates various building electrical systems and control configurations.
• Fire-Rated Construction: UL-cUL fire-rated up to 3 hours for code compliance in fire-rated door assemblies and life safety applications.
• Heavy-Duty Construction: Armature plate thru-bolted design maintains consistent contact with magnet for reliable long-term performance.
• Manufacturer Warranty: 2 year limited warranty provides added confidence and protection for commercial installations.

Technical Specifications

• Application: Commercial Doors
• Commercial/Residential: Commercial
• Department: Door Hardware
• Door Hand Direction: Non-Handed
• Electronic: Yes
• Mounting Method: Wall
• Product Category: Door Controls
• Product Finish: Aluminum
• Product Group: Door Controls
• Product Subgroup: Electromagnetic Door Holder / Releases
• Product Type: Electromagnetic Door Holder / Releases
• Product Voltage: 24VAC/DC
• Subcategory: Electromechanical Closers & Holders
• UL Listing Type: UL-cUL Fire-Rated Up to 3 Hours
• Warranty: 2 Year Limited
• Wiring: Concealed or Surface

Installation & Operation

1. Verify electrical requirements match available power supply. Confirm 24VAC/DC voltage and current capacity before proceeding.
2. Disconnect power supply before beginning installation. Follow all applicable electrical codes and safety procedures.
3. Mount the unit in the specified wall location ensuring adequate clearance for wiring access, ventilation, and future service requirements. Note that substantial wall reinforcement is required for proper installation.
4. Route and connect wiring according to manufacturer wiring diagrams. Use appropriate wire gauge and connectors for the application with concealed or surface wiring options.
5. Configure operational settings including fail-safe operation and integrate with key switch release system per application requirements.
6. Restore power and test all functions including normal holding operation, test switch functionality, and integration with alarm or smoke detector release systems.
7. Complete final inspection and document settings. Refer to manufacturer documentation for complete wiring diagrams, programming instructions, and troubleshooting.

Professional Applications

• Commercial Building Fire Safety Systems
• Healthcare Facility Door Control
• Educational Institution Safety Systems
• Industrial Facility Access Control
• Multi-Tenant Residential Fire Compliance
• Government and Municipal Building Safety
• Emergency Egress Door Management

Why Choose Norton Rixson Quality?

Norton Rixson electromagnetic door holders deliver professional-grade reliability with heavy-duty thru-bolted armature construction and UL-cUL fire-rating up to 3 hours. The 2 year limited warranty and fail-safe operation design ensure dependable performance in demanding commercial fire safety applications. Engineered for critical life safety systems where reliable door control and code compliance are essential.