Electrify compatible commercial exit devices with the ACSI 1550K-MDC Motorized Latch Retraction and Dogging Kit.

The 1550K-MDC is specifically engineered for compatible Corbin Russwin ED4000, Corbin Russwin ED5000, and ACCENTRA/Yale 7000 Series exit devices, providing quiet 24VDC motorized latch retraction for access control, automatic door operator, and remote unlocking applications.

When energized, the kit retracts the exit-device latch and simultaneously depresses the pushbar into the dogged position, allowing free passage through the opening while maintaining normal mechanical egress operation when power is removed.

Key Features

• Genuine ACSI – Architectural Control Systems

• Model 1550K-MDC

• Series 1550K-MD

• Motorized latch retraction kit

• Simultaneous electric latch retraction and dogging

• Designed for compatible:

  • Corbin Russwin ED4000 Series

  • Corbin Russwin ED5000 Series

  • ACCENTRA / Yale 7000 Series

• 24VDC operation

• Continuous-duty rated

• Low power consumption

• Quiet motorized operation

• Non-polarized wiring leads

• On-board diagnostic LEDs

• Automatic retry feature

• Interfaces with access-control systems

• Interfaces with life-safety systems

• UL listed for panic exit hardware

• UL listed for fire exit hardware

• Compatible with multiple exit-device configurations

• Field-installable kit

• Factory installation also available

• Exit device sold separately

Motorized Latch Retraction

The 1550K-MDC converts a compatible mechanical exit device to provide:

Electric Latch Retraction

When power is applied, the motor retracts the device's latch mechanism electronically.

This allows a compatible opening to be remotely unlocked without requiring someone to manually depress the pushbar.

Simultaneous Electric Dogging

The 1550K-MDC provides:

Simultaneous Latch Retraction and Electric Dogging

When activated, the pushbar is electrically held in the depressed position while the latch remains retracted.

This allows the door to operate in a push/pull free-passage condition during an authorized unlock period.

When power is removed, the device returns to its normal secure operating condition.

Compatible Exit Devices

The MDC suffix identifies the kit designed specifically for:

Corbin Russwin

• ED4000 Series

• ED5000 Series

ACCENTRA / Yale

• 7000 Series

Important

Different exit-device manufacturers and series require different ACSI 1550K-MD suffixes.

The 1550K-MDC should not be substituted for another 1550K-MD model without confirming compatibility.

Compatible Exit Device Types

ACSI's 1550K-MD system is available for compatible:

• Rim exit devices

• Mortise exit devices

• Surface vertical rod devices

• Concealed vertical rod devices

Exact compatibility depends on the exit-device series and configuration.

24VDC Operation

The 1550K-MDC operates on:

24VDC

A filtered and regulated power supply appropriate for motorized latch retraction should be used.

ACSI recommends compatible Series 1400 power supplies for its electric exit-device systems.

Continuous Duty

The motorized latch retraction assembly is:

Continuous-Duty Rated

This allows the exit device to remain electrically retracted during extended authorized unlock periods when the system is properly powered and installed.

Quiet Motor Operation

Compared with traditional high-inrush solenoid latch-retraction systems, the motor-driven 1550K-MD platform is designed for:

Quiet Operation

This makes it particularly useful in:

• Offices

• Healthcare facilities

• Schools

• Libraries

• Hotels

• Institutional buildings

where operating noise may be undesirable.

Automatic Retry

The 1550K-MDC incorporates:

Automatic Retry

If the latch cannot fully retract because of binding or another temporary condition, the system can automatically attempt to complete the retraction cycle again.

On-Board Diagnostic LEDs

Built-in diagnostic LEDs assist with:

• Installation

• Setup

• Troubleshooting

• Operational verification

This makes system commissioning and service easier for qualified technicians.

Non-Polarized Leads

The kit uses:

Non-Polarized Wiring Leads

which simplifies field wiring during installation.

Access Control Integration

The 1550K-MDC can be integrated with compatible:

• Card-reader systems

• Keypads

• Request-to-enter systems

• Time schedules

• Building access-control systems

• Automatic door operators

• Remote release switches

A compatible control relay and properly sized 24VDC power supply may be required depending on the system.

Automatic Door Operator Applications

Motorized latch retraction is especially useful when an exit device is installed on a door with an:

Automatic Swing Door Operator

A typical sequence can be configured so that:

1. Access is authorized

2. Exit-device latch retracts

3. Door operator activates

4. Door opens without fighting the latch

5. System returns to secure operation after the cycle

Proper control sequencing is required.

Life-Safety System Integration

The 1550K-MDC can interface with compatible:

Life-Safety Systems

depending on the opening and system design.

Always follow applicable:

• Building codes

• Fire codes

• Egress requirements

• Manufacturer wiring instructions

• Authority Having Jurisdiction requirements

Panic & Fire Exit Hardware

ACSI lists the 1550K-MD motorized latch-retraction system for use with both:

• Panic Exit Hardware

• Fire Exit Hardware

when installed on compatible listed devices and according to the manufacturer's requirements.

Important

Fire-rated openings must maintain the listing of the complete door, frame, exit device, electrification, and control system.

Field Installable

The 1550K-MDC is available as a field-installable kit for compatible exit devices.

Installation requires removal of the exit-device end cover and access to the pushbar mechanism.

Professional installation by a qualified commercial door or access-control technician is recommended.

Exit Device Not Included

This product is the:

Motorized Latch Retraction Modification / Kit Only

It does not include the complete exit device.

The existing or separately purchased exit device must be compatible with the 1550K-MDC.

Common Applications

Ideal for:

• Automatic door entrances

• Access-controlled doors

• Schools

• Universities

• Hospitals

• Healthcare facilities

• Government buildings

• Airports

• Stadiums

• Office buildings

• Commercial facilities

• High-traffic entrances

• Remote unlocking systems

• Scheduled unlock applications

Product Specifications

Brand: ACSI
Manufacturer: Architectural Control Systems, Inc.
Series: 1550K-MD
Model: 1550K-MDC
Product Type: Motorized Latch Retraction / Dogging Kit
Voltage: 24VDC
Duty Rating: Continuous Duty
Operation: Electric Latch Retraction and Dogging
Motorized: Yes
Diagnostic LEDs: Yes
Automatic Retry: Yes
Leads: Non-Polarized
Field Installable: Yes
Factory Installable: Yes
Panic Hardware Listed: Yes
Fire Exit Hardware Listed: Yes
Exit Device Included: No

Compatible Exit Device Series

Corbin Russwin:

• ED4000

• ED5000

ACCENTRA / Yale:

• 7000 Series

What's Included

Standard kit includes the components required for the 1550K-MDC latch-retraction modification, including:

• Motorized latch-retraction assembly

• Device-specific mounting components

• Wiring leads

• Required installation hardware

• Technical identification labels

Exact kit contents may vary with manufacturing revisions.

Not Included

• Exit device

• 24VDC power supply

• Access-control reader

• Door operator

• Relay module

• Wiring

• Door

• Frame

• Installation labor

Important Ordering Information

Before ordering, verify:

• Exit-device manufacturer

• Exact exit-device series

• Device length

• Rim, mortise, SVR, or CVR configuration

• Existing dogging configuration

• 24VDC power supply capacity

• Access-control sequence

• Fire-rated or panic-only application

Important

The MDC suffix is device-specific.

Use 1550K-MDC only with compatible Corbin Russwin ED4000 / ED5000 or ACCENTRA/Yale 7000 Series exit devices.