ACSI 1550K-MDV Electric Motor ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$777.00
$490.97
ACSI 1550K-MDV Electric Motor Latch Retraction Kit for Von Duprin 33A, 35A, 98, 99 - motor, circuit board, and latch arm assembly shown

ACSI 1550K-MDV Electric Motor Latch Retraction Kit for Von Duprin 33A, 35A, 98,99

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Model: 1550K-MDV
From the 1500 Series Collection

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

$777.00
$490.97
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ACSI 1550K-MDV Electric Motor Latch Retraction Kit for Von Duprin 33A/35A, 98/99

The ACSI 1550K-MDV is a motorized electric latch retraction kit designed for Von Duprin 33A/35A and 98/99 Series exit devices. Part of the ACSI 1500 Series, this kit enables simultaneous latch retraction and dogging with quiet, low-power motor operation for commercial and institutional doors. All ACSI modifications ship UL Listed, with wiring diagrams and technical support included. Supports field or factory installation and integrates with modern access control systems.

Key Features

  • Simultaneous electric latch retraction and dogging (push bar depressed)
  • UL Listed for panic and fire-rated exit devices
  • Compatible with mortise, rim, concealed, and surface vertical rod exit hardware
  • Field or factory installed
  • Quiet motor operation, continuous duty rated
  • 24VDC, low power consumption
  • Non-polarized leads, on-board diagnostic LEDs, and automatic retry
  • Interfaces with life-safety and alarm systems
  • Recommended with ACSI Series 1400 power supplies

Product Specs

Subcategory:
Electric Motor Latch Retraction
Series:
1500 Series
Collection:
1500 Series
Product Type:
Electric Motor Latch Retraction Kit
Compatibility:
Von Duprin 33A/35A, 98/99
Warranty:
1 Year
Product Group:
Exit Devices and Trim
Product Subgroup:
Exit Device Electrification
Commercial/Residential:
Commercial
Electronic:
Yes
Lock Function:
Part/Component
Parts and Accessories Type:
Modification Kit
Product Attribute:
Parts and Accessories
Tags:
1550k mdv, 1550k
Product Function:
Part/Component
Electrical Configuration:
Motorized Latch Retraction
Product Category:
Electronic Access Controls
Department:
Door Hardware

ACSI 1550K-MDV – Frequently Asked Questions

1) Will the ACSI 1550K-MDV electric latch retraction kit work on my Von Duprin 99 exit device?
Yes. The 1550K-MDV is built for Von Duprin 33A/35A and 98/99 Series devices, and a 99 rim, mortise, concealed vertical rod, or surface vertical rod device all fall inside that range. It is a modification kit, so the motor, board, and latch arm assembly go into the device you already have rather than replacing it. If your device is a Von Duprin 22 instead, that takes the 1550K-MDV22, not this kit.
2) What is the difference between the ACSI 1550K-MDV motor kit and the 1550K-VD solenoid kit for Von Duprin?
Both electrify Von Duprin exit devices, but the drive is different. The 1550K-MDV is motorized latch retraction, running on 24VDC with low power draw, quiet motor operation, and a continuous duty rating, so it can be held retracted through a full unlocked schedule. The 1550K-VD is the solenoid latch kit, covering Von Duprin 33/35 and 98/99. If the opening is on a scheduled unlock or gets heavy access control traffic, the motor version is the one to specify.
3) Can I use an ACSI latch retraction kit on a fire rated exit device?
The 1550K-MDV ships UL Listed for panic and fire rated exit devices, so it can go on a fire door assembly's exit hardware. It also retracts the latch and dogs the device at the same time when the push bar is depressed, which is what lets a fire rated device be held in an electrically unlocked state without mechanical dogging.
4) What power supply do I need for an ACSI 1550K-MDV latch retraction kit?
The kit runs on 24VDC and ACSI recommends its Series 1400 power supplies with it. Budget the power supply as a separate line on the order, since the modification kit itself is only the motor and control assembly that goes inside the exit device. Leads are non-polarized, so wiring in the field is less fussy than most electrified exit hardware.
5) Will an ACSI 1550K kit fit Corbin Russwin, Yale, Sargent, or Falcon exit devices?
Not the MDV version. The 1550K-MDV is cut for Von Duprin 33A/35A and 98/99 only. Within the same 1550K modification kit family, the MDC covers Corbin Russwin ED4000/5000 and Yale 7000, the MDD covers Dorma 9000, and the MDT, MDS, MDP, MDF, MDO, MDH, and MDX variants cover Hager, Sargent, Precision, Falcon, Design Hardware, and Dorex. Order by the brand and series of the device that is already on the door.
6) I want doors unlocked during business hours without dogging them by hand every morning. Will this do it?
That is what motorized latch retraction is for. The 1550K-MDV retracts the latch and dogs the device electrically with the push bar depressed, so a time schedule or access control output holds the opening in a push-pull state and releases it back to latched at close. It is continuous duty rated, so holding it retracted all day is within the design of the kit. This also gets you scheduled unlock on fire rated openings, where mechanical dogging is not permitted.
7) Do I have to send my exit devices out to be electrified, or can the ACSI 1550K be installed on site?
Either way works. The 1550K-MDV is field or factory installed, and it ships with wiring diagrams and technical support. For a building already hung with Von Duprin 33A/35A or 98/99 devices, field installation means the doors stay in place and the devices never leave the site.
8) Can the ACSI 1550K-MDV be tied into a card reader or the fire alarm system?
Yes on both. The kit integrates with access control systems, so a card reader, keypad, or REX can drive the retraction, and it interfaces with life safety and alarm systems so the device drops back to latched on an alarm condition. On-board diagnostic LEDs and automatic retry are built into the board, which is what a service tech uses to troubleshoot the run without pulling the device apart.
9) How do I order the ACSI 1550K-MDV, and is there more than one version of it?
There is one part to order: 1550K-MDV. The letters at the end are the device match, so MDV is the Von Duprin 33A/35A and 98/99 kit and the other suffixes in the 1550K series are other manufacturers. It is a commercial modification kit and a replacement part for the exit device, not a complete device, so the exit hardware has to already be on the door.
How fast can I get the ACSI 1550K-MDV 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-MDV come with a warranty?
Absolutely. The ACSI 1550K-MDV 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-MDV?
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-MDV from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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