About this item
The SDC LR100DMK is a retrofit electric latch retraction (ELR) and dogging kit that converts an existing Falcon Dor-O-Matic mechanical exit device into an access-controlled, electrified opening. It fits the Dor-O-Matic 1490 and 1590 series on a 36-inch device, and the whole point is that you don't replace the panic hardware you already have. The kit installs into the device's rail, motorizes the latch, and ties the door into your access control, card reader, or building automation system. For anyone modernizing a building with older Dor-O-Matic exit devices, that's the difference between a few hundred dollars in parts and a full hardware replacement.
What the LR100DMK actually does
When the kit energizes, a motor retracts the exit device latch and pulls the push pad into the dogged (depressed) position. That lets the door free-wheel for momentary or sustained push-and-pull operation, which is what you want for access control during business hours or for tying the door to an automatic operator. Trigger it from a card reader, a remote, or a building automation system, and the door unlocks. Cut the signal and the latch returns to normal. Through all of it, the inside always allows free egress, because the mechanical exit device underneath never loses its life-safety function.
The "QuietDuo" name points to the real upgrade over older technology: this is a motorized kit, not a solenoid. Motorized ELR runs quieter, draws far less current, and lasts longer than the buzzing solenoid retraction kits it replaces. The push pad depresses electrically for a quieter push-pull, and the kit automatically re-triggers if the device doesn't pull on the first try.
SDC LR100DMK specifications
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Type: Field-installed retrofit electric latch retraction and dogging kit, motorized.
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Fits: Falcon Dor-O-Matic 1490 and 1590 series exit devices, 36-inch opening.
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Voltage: 24VDC plus or minus 10 percent.
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Current: Low draw, roughly 700 mA inrush and 200 mA continuous at 24VDC, which is a fraction of what solenoid kits pull.
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Function: Simultaneous latch retraction and dogging, with the push pad electrically depressed for quieter operation.
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Egress: Exit device always provides uninhibited egress.
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Fire rating: UL classified for use with both 3-hour fire-rated and non-fire-rated exit devices.
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Pairs of doors: No door sequencer required for a pair of manual doors when connected to a suitable power supply.
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Wiring: Low current allows longer wire runs with smaller-gauge wire.
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Reliability: Automatic re-trigger if the device does not pull on the first attempt.
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Compatibility: Works with low-energy operators, including SDC AUTO series operators with a built-in power supply.
Why retrofit instead of replacing the exit device
This is the buying decision in a sentence: a new electrified exit device is expensive and labor-heavy, while the LR100DMK electrifies the Dor-O-Matic device you already own, often without removing it from the door. You skip the cost of new panic hardware and most of the install labor, and the low current draw means you may not need a heavy power supply or large-gauge home runs. For integrators bidding modernization work on schools, offices, and institutional buildings full of older Dor-O-Matic hardware, the math usually favors the kit by a wide margin.
One thing to confirm before ordering: this is the Dor-O-Matic specific kit (the DMK suffix) for 1490 and 1590 series devices at 36 inches. SDC makes brand-specific versions for Von Duprin, Precision, Sargent, Adams Rite, and others, so match the kit to your exact exit device brand and model.
Order the SDC LR100DMK from American Locksets
We stock the full SDC QuietDuo LR100 line from authorized distribution, so every kit ships with a real manufacturer warranty. Find the version for your exit device brand in the latch retraction and dogging kits category.
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