**ACSI 1550K-MDV ELECTRIC MOTOR LATCH RETRACTION MODIFICATION / KIT
for Von Duprin 33A/35A, 98/99 – OVERVIEW**
The ACSI 1550K-MDV is a high-performance electric motor latch retraction kit designed for Von Duprin 33A/35A and 98/99 Series exit devices. Part of the renowned ACSI 1550K series, this motorized solution enables simultaneous latch retraction and dogging, delivering smooth, quiet, and low-power operation for commercial and institutional doors.
Whether you’re specifying a 1550K MDV modification for new construction or retrofitting existing hardware, this kit provides UL-certified reliability with easy integration into modern access control systems. ACSI provides all modifications UL Listed, along with wiring diagrams and technical support.
Buy the ACSI 1550K-MDV Electric Motor Latch Retraction Kit for seamless compatibility with Von Duprin 33/35 and 98/99 exit devices—backed by dependable field or factory installation options.
Key Product Features:
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Simultaneous electric latch retraction and dogging (push bar depressed)
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UL Listed for both panic and fire-rated exit devices
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Compatible with mortise, rim, concealed, and surface vertical rod exit hardware
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Field or factory installed
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Quiet motor operation
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Continuous duty rated
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Low power consumption (24VDC)
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Non-polarized leads, on-board diagnostic LEDs, and automatic retry
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Interfaces with life-safety and alarm systems
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Recommended with ACSI Series 1400 power supplies
Part of the ACSI 1550K Modification Kit Collection:
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1550K-MDV – Von Duprin 33A/35A, 98/99
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1550K-MDV22 – Von Duprin 22
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1550K-MDC – Corbin Russwin ED4000/5000, Yale 7000
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1550K-MDD – Dorma 9000
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1550K-MDT / MDS / MDP / MDF / MDO / MDH / MDX – For Hager, Sargent, Precision, Falcon, Design Hardware, Dorex
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1550K-VD – Solenoid Latch Kit for Von Duprin 33/35, 98/99
The 1550K MDV is the go-to solution when reliable, electrified performance is needed for Von Duprin exit devices—delivering enhanced security, access control, and code compliance.
RESOURCES & DOWNLOADS
Manufacturer Resources
Product Specs
- Category:
- Electronic Access Controls
- Subcategory:
- Electric Motor Latch Retraction
- Series:
- 1500 Series
- Collection:
- Exit Control Locks
- Product Type:
- Electric Motor Latch Retraction Kits
- Compatibilty:
- Von Duprin 33A/35A, 98/99
- Function:
- Part/Component
- Warranty:
- 1 Year
- Product Group:
- Electronic Access Controls
- Product Subgroup:
- Parts and Accessories
- Commercial/Residential:
- Commercial
- Electronic:
- Yes
- Lock Function:
- Part/Component
- Electric Option:
- Motorized Latch Retraction
- Parts and Accessories Type:
- Replacement Parts
- Product Attribute:
- Parts and Accessories
- Tags:
- 1550k mdv, 1550k