ACSI 1550K-MDD Electric Motor ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$720.98
$460.88
ACSI ACSI 1550K-MDD Electric Motor Latch Retraction Modification/Kit for Dorma 9000 1550K-MDD

ACSI 1550K-MDD Electric Motor Latch Retraction Modification/Kit for Dorma 9000

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Model: 1550K-MDD
From the 1500 Series Collection

In Stock (leaves warehouse same day if ordered before 3pm ET)

$720.98
$460.88
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ACSI 1550K-MDD ELECTRIC MOTOR LATCH RETRACTION MODIFICATION / KIT

for Dorma 9000

The ACSI 1550K-MDD is a motorized latch retraction and dogging modification kit specifically engineered for Dorma 9000 series exit devices. As a member of ACSI’s widely recognized 1550K series, this solution delivers quiet, dependable, and continuous-duty electric latch retraction while meeting the highest UL panic and fire exit standards.

This field- or factory-installable kit is ideal for retrofitting existing Dorma hardware into electrified access control systems. The 1550K-MDD makes it easy to upgrade doors in commercial, institutional, or security-sensitive facilities with modern electronic functionality.

Buy the ACSI 1550K-MDD Electric Motor Latch Retraction Kit for a seamless electrification upgrade tailored to Dorma 9000 devices.

Key Product Features:

  • Simultaneous electric latch retraction and dogging (push bar depressed)

  • UL Listed for both panic and fire-rated exit devices

  • Compatible with mortise, rim, concealed, and surface vertical rod configurations

  • Quiet motor operation, continuous duty rated

  • Low power consumption – 24VDC operation

  • On-board diagnostic LEDs and automatic retry function

  • Non-polarized leads for simplified installation

  • Interfaces with life-safety and alarm systems

  • ACSI Series 1400 power supplies recommended

Part of the ACSI 1550K Electric Latch Retraction Series:

  • 1550K-MDV / MDV22 – Von Duprin 33A/35A, 98/99, 22

  • 1550K-MDC – Corbin Russwin ED4000/5000, Yale 7000

  • 1550K-MDD – Dorma 9000

  • 1550K-MDT / MDS / MDP / MDF / MDH / MDO / MDX – For Hager, Sargent, Precision, Falcon, Design Hardware, Dorex

  • 1550K-VD – Solenoid Latch Kit for Von Duprin 33/35 and 98/99

Whether you’re specifying 1550K for new builds or retrofitting Dorma exit hardware, this series ensures code compliance, performance, and smooth integration into access control systems.

Product Specs

Subcategory:
Electric Motor Latch Retraction
Series:
1500 Series
Collection:
1500 Series
Product Type:
Electric Motor Latch Retraction Kits
Compatibility:
Dorma 9000
Warranty:
1 Year
Product Group:
Electronic Access Controls
Product Subgroup:
Parts and Accessories
Commercial/Residential:
Commercial
Electronic:
Yes
Lock Function:
Part/Component
Parts and Accessories Type:
Replacement Parts
Product Attribute:
Parts and Accessories
Tags:
1550k
Product Function:
Part/Component
Electrical Configuration:
Motorized Latch Retraction
Product Category:
Electronic Access Controls
Department:
Door Hardware

ACSI 1550K-MDD – Frequently Asked Questions

1) Will the ACSI 1550K-MDD electric latch retraction kit work on a Dorma 9000 exit device?
That's exactly what the 1550K-MDD is built for. It's the Dorma 9000 version of ACSI's 1550K motorized latch retraction kit, and the kit is model-specific, so a 9000 series device is the opening it goes on. If your exit hardware is a different brand, you want a different suffix in the same series: MDV or MDV22 for Von Duprin 33A/35A, 98/99 and 22, MDC for Corbin Russwin ED4000/ED5000 and Yale 7000, and the MDT, MDS, MDP, MDF, MDH, MDO and MDX kits for Hager, Sargent, Precision, Falcon, Design Hardware and Dorex.
2) Does the ACSI 1550K-MDD work on a fire rated exit device, or only on panic hardware?
Both. The 1550K-MDD is UL Listed for panic and for fire-rated exit devices, so you can use it on a fire door assembly as well as a standard panic opening. That matters on the fire side, because mechanical dogging isn't allowed on a fire exit device, and this kit does its dogging electrically through the motor.
3) Which Dorma 9000 configurations does the ACSI 1550K-MDD kit cover: rim, mortise, or vertical rod?
All of them. The 1550K-MDD covers mortise, rim, concealed vertical rod and surface vertical rod configurations, so a building with a mix of single rim doors and vertical rod pairs can standardize on one kit rather than sorting a different part number per device style.
4) What power supply do I need for an ACSI 1550K electric latch retraction kit?
The kit runs on 24VDC and draws low current, and ACSI's Series 1400 power supplies are the recommended match. Budget for that supply as a separate line on the order, along with door cord or transfer hinge to get power into the door leaf. The motor is continuous duty rated, so it can sit retracted through a scheduled unlock period without cooking.
5) What's the difference between a motorized latch retraction kit and a solenoid latch retraction kit for exit devices?
Current draw and noise, mostly. The 1550K-MDD is motorized: quiet, continuous duty rated, low power at 24VDC, which is why it can hold latches retracted all day on a scheduled unlock without a heavy-duty supply behind it. ACSI still offers a solenoid version in the same family, the 1550K-VD, but that one is for Von Duprin 33/35 and 98/99 devices, not Dorma. If your device is a Dorma 9000, motorized is the path.
6) Can the ACSI 1550K-MDD be tied into a fire alarm or life safety system?
It interfaces with life-safety and alarm systems, so the latches can be dropped on an alarm signal or a loss of power. The kit also carries on-board diagnostic LEDs and an automatic retry function, which is what you want when a door is out of alignment or a rod is binding: the motor tries again instead of sitting stalled, and the LED tells the tech at the door whether the fault is at the kit or upstream at the supply.
7) Does it matter which way I land the wires on an ACSI 1550K latch retraction kit?
No. The leads are non-polarized, so you can land the 24VDC either way round without hunting for the positive side in the raceway. That's one less thing to get wrong on a hinge-side transfer where you're working blind through the door edge.
8) Is the ACSI 1550K-MDD a commercial-grade part or is it meant for residential doors?
Strictly commercial. The 1550K-MDD is a component that mounts inside a Dorma 9000 exit device, and exit devices belong on commercial, institutional and multi-family egress openings, not on a house. Think office and campus entrances, healthcare corridors and secured lobby doors being brought onto card access.
How fast can I get the ACSI 1550K-MDD delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the ACSI 1550K-MDD come with a warranty?
Absolutely. The ACSI 1550K-MDD is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the ACSI 1550K-MDD?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the ACSI 1550K-MDD from ZenSupply?
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