- Description
- Specifications
SECO-LARM DH-171SQ – Flush-Mount Magnetic Door Holder (UL Listed)
Low-profile electromagnetic door holder with tri-voltage operation, designed for safety and convenience in commercial access control systems.
The SECO-LARM DH-171SQ is a flush-mounted magnetic door holder ideal for use with door closers in public buildings, stairwells, and fire-rated areas. It provides reliable holding power with automatic release in emergencies or power failure. This UL Listed holder features a cast aluminum faceplate, adjustable armature plate, and spike suppression circuitry for durability and safe operation.
Key Features:
• Holding Force: 33-lb (15kg)
• Voltage: 12/24 VAC/VDC or 120VAC
• Mounting: Flush-mount design
• Build: Cast aluminum faceplate with spike suppression
• Operation: Fail-safe with no residual magnetism
• Approvals: UL Listed
Ideal For:
• Stairwell and corridor fire doors
• Door control in schools, hospitals, and commercial buildings
• Applications requiring automatic door release upon fire alarm
Why You Should Use This:
• UL listed for reliable safety compliance
• Tri-voltage input for flexible installation
• Adjustable armature simplifies door alignment
Key Highlights:
- ✅ 33-lb holding force for secure door retention
- ✅ Adjustable armature plate adapts to door alignment
- ✅ Spike suppression circuit protects internal components
- ✅ No residual magnetism for easy door release
Frequently Asked Questions:
Q: Does this require a separate power supply?
A: Yes, it must be connected to a 12/24VDC/VAC or 120VAC source.
Q: Can this be used with fire alarm systems?
A: Yes, it is ideal for fire doors and stairwell control.
Q: Is it compatible with SECO-LARM door closers?
A: Yes, works with models like SD-C121-S, SD-C131-SQ, and others.
