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

**ACSI 1550K-MDD ELECTRIC MOTOR LATCH RETRACTION MODIFICATION / KIT

for Dorma 9000 – OVERVIEW**

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.

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