---
product_id: 530120445
title: "Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); For Use with Door Closers to Control the Release and Closing of Residential, Commercial and Public Area Doors"
brand: "seco-larm"
price: "$559"
currency: NZD
in_stock: false
category: "Seco Larm"
url: https://www.desertcart.nz/products/530120445-seco-larm-dh-171sq-flush-mount-magnetic-door-holder-holding
store_origin: NZ
region: New Zealand
---

# Tri-voltage compatibility 33-lb magnetic hold Flush-mount sleek design Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); For Use with Door Closers to Control the Release and Closing of Residential, Commercial and Public Area Doors

**Brand:** seco-larm
**Price:** $559
**Availability:** ❌ Out of Stock

## Summary

> 🧲 Elevate your space with magnetic mastery—hold the door, hold the moment!

## Quick Answers

- **What is this?** Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); For Use with Door Closers to Control the Release and Closing of Residential, Commercial and Public Area Doors by seco-larm
- **How much does it cost?** $559 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/530120445-seco-larm-dh-171sq-flush-mount-magnetic-door-holder-holding)

## Best For

- seco-larm enthusiasts

## Why This Product

- Trusted seco-larm brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fail-Safe Release:** No residual magnetism ensures smooth, reliable door release every time—safety first.
- • **Powerful 33-lb Hold:** Securely keeps doors open with industry-leading magnetic force.
- • **Flush-Mount Elegance:** Discreet installation blends perfectly with modern interiors—no bulky hardware in sight.
- • **Universal Tri-Voltage:** Seamlessly works with 12/24 VAC/VDC and 120VAC systems for ultimate flexibility.
- • **Precision Adjustable Armature:** Easily fine-tune alignment post-installation for flawless operation and longevity.

## Overview

The Seco-Larm DH-171SQ is a UL-listed flush-mount magnetic door holder delivering a robust 33-pound holding force. Designed for seamless integration with Seco-Larm door closers, it supports tri-voltage operation (12/24 VAC/VDC, 120VAC) and features a low-profile cast aluminum faceplate. Its fail-safe, no residual magnetism design ensures effortless door release, while adjustable armature plates guarantee perfect alignment. Engineered in the USA with UL, CE, and RoHS certifications, it’s the professional choice for residential, commercial, and public spaces seeking reliable, sleek door control.

## Description

Designed for use with a UL-listed Seco-Larm door closer (sold separately), the Seco-Larm Magnetic Door Holder allows you to remotely control the release and closing of the door. Keep your door open all day with the door holder making sure it stays open, then when you're ready to close up, activate the door closer and the door holder will automatically release at the same time.The unit consists of two main components: 1) the electrified magnetic door holder that mounts to the wall behind your door, and 2) the armature plate that mounts onto the inside of your door in alignment with the magnet. When the door is opened all the way, the metal plate on the door is attracted to the electrified magnet on the wall, holding the door open.Used with Seco-Larm door closers to control door release and closingProvides 33 pounds of electromagnetic holding force (15kg)No residual magnetism allows easy release; fail-safe operationLow profile design with cast aluminum faceplate3 voltages: 12/24 VAC/VDC, and 120VACBuilt-in voltage spike suppressorTwo models are available. Choose between a magnetic door holder that surface-mounts onto the wall or one that flush-mounts into the wall. Both models come with all the mounting hardware you need. The armature plate is adjustable to make installation easy on any door and also adjusts to accommodate post-installation alignment changes. The unit features tri-volt coils (12/24 VAC/VDC, and 120VAC) and a built-in spike suppressor.The unit works with any Ul-listed Seco-Larm door closers. It also optionally works with Seco-Larm extension bars: 1/2", 3/4", 1", 2", 3", 4", 5", 6", 7" (13mm, 19mm, 25mm, 50mm, 76mm, 102mm, 127mm, 152mm, 178mm).ContentsMagnetic Door HolderArmature PlateBack Box (DH-151SQ Surface-Mount model only)(2) #10x11/4" Wood Screws(4) 4x8 Machine Screws(2) 3x10 Machine Screws(2) 5x15 Machine Screws(2) JumpersInstruction ManualNOTE: Requires a Seco-Larm door closer, sold separately.Technical DetailsManufacturer Part #: DH-171SQUPC: 676544017493Type: Flush-MountOperating Voltage: 12/24 VAC/VDC, 120VACCurrent Draw:52mA at 12VAC, 60mA at 12VDC27mA at 24VAC, 31m at 24VDC24mA at 120VACHolding Force: 33 pounds (15kg)Magnet Dimensions: 2-3/4 x 4-9/16 x 2-1/16 inches (70 x 116.5 x 52 mm)Armature Dimensions: 2-9/16 x 2-9/16 x 1-9/16 inches (65 x 65 x 40 mm)Magnet Box Weight: 1 pound 1.5 ounces (496g)Door Armature Weight: 8.1 ounces (230g)Approvals: UL, CE, RoHSWarranty: 2 Years

## Features

- Used with Seco-Larm door closers to control door release and closing
- Provides 33 pounds of electromagnetic holding force (15kg)
- No residual magnetism allows easy release; fail-safe operation
- 3 voltages: 12/24 VAC/VDC, and 120VAC
- Installation Type: Flush-Mount

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01M5EHW8U |
| Country of Origin | USA |
| Included Components | 1x Door holder, 1x Armature, 2x Jumpers (1x pre-installed), 2x M5x15 Machine screws, 2x #10x1 1 /4" Wood screws, 4x M4x8 Machine screws, 2x M3x10 Machine screws, 1x Back box, 1x 1" Extension bar, 1x Extension bar wrench |
| Item Weight | 496 g |
| Item model number | DH-171SQ |
| Manufacturer | Seco-Larm |
| Package Dimensions | 20.6 x 12.8 x 8.2 cm; 496 g |
| Size | Pack of 1 |
| Specification Met | UL |
| UPC | 676544017493 |

## Product Details

- **Brand:** Seco-Larm
- **Colour:** Silver
- **Installation Type:** Screw-In
- **Item Weight:** 496 Grams

## Images

![Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); For Use with Door Closers to Control the Release and Closing of Residential, Commercial and Public Area Doors - Image 1](https://m.media-amazon.com/images/I/31MHuWCw8zL.jpg)
![Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); For Use with Door Closers to Control the Release and Closing of Residential, Commercial and Public Area Doors - Image 2](https://m.media-amazon.com/images/I/31k8Qe8xzAL.jpg)
![Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); For Use with Door Closers to Control the Release and Closing of Residential, Commercial and Public Area Doors - Image 3](https://m.media-amazon.com/images/I/415sLscVaNL.jpg)
![Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); For Use with Door Closers to Control the Release and Closing of Residential, Commercial and Public Area Doors - Image 4](https://m.media-amazon.com/images/I/41pz-Qu535L.jpg)
![Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); For Use with Door Closers to Control the Release and Closing of Residential, Commercial and Public Area Doors - Image 5](https://m.media-amazon.com/images/I/51GeU+rM1HL.jpg)

## Questions & Answers

**Q: Do you sell replacement key fobs for the secolarm dh171sq?**
A: There are no “keyfobs” with or for this product.

**Q: Do you have to have power run to operate this door stop?**
A: Yes

**Q: it can be used without power ?**
A: No

**Q: Will these mount to a single gang electrical box?**
A: Yes.  It will fit to single-gang box.

## Frequently Bought Together

- Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding Force 33-lb (15kg); for Use with Door Closers to Control The Release and Closing of Residential, Commercial and Public Area Doors
- Kidde SM120X Interconnect Accessories Smoke Relay Module
- Seco-Larm DH-151SQ Magnetic Door Holder, Surface-Mount, Adjustable Armature Plate, 33-lb Holding Force, Cast Aluminum Faceplate, Built-in Voltage Spike Suppressor, Low Profile Design

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-13*