The Alarm Lock 103 Lektrolok Fail-Safe Electric Deadbolt is a heavy-duty, electrically operated commercial locking device designed for controlled door access, remote unlocking, and automatic door security applications.

Featuring 24V AC/DC operation, a continuous-duty solenoid, a 5/8-inch diameter locking bolt, and fail-safe functionality, the Alarm Lock 103 offers dependable electronic locking for commercial, institutional, and industrial facilities.

The Model 103 operates in a fail-safe configuration, meaning the deadbolt projects and locks the door when electrical power is supplied. When power is interrupted or removed, the deadbolt automatically retracts, allowing the door to unlock.

The compact surface-mounted design is particularly suitable for narrow-stile aluminum storefront doors, commercial metal doors, and other openings where traditional electric locking hardware may be difficult to install.

The device can be controlled using a compatible remote push button, key switch, programmable timer, or access control system. These options allow building operators to control locking and unlocking without manually operating the deadbolt.

The molded aluminum housing provides a durable, professional appearance that complements commercial door frames and architectural hardware.

The Alarm Lock 103 is supplied with three strike/keeper configurations and corresponding magnets, providing installation flexibility for different door and frame applications.

Key Features and Benefits

Fail-Safe Electric Locking

• Deadbolt projects when electrical power is applied.

• Automatically retracts when power is removed.

• Provides an electrically controlled locking solution.

• Suitable for applications requiring release upon power interruption.

• Can be integrated with properly designed emergency release systems.

• Ideal for remotely controlled commercial door installations.

24V AC/DC Electrical Operation

• Operates on 24-volt alternating or direct current.

• Compatible with an appropriately rated electrical power supply.

• Continuous-duty solenoid supports extended energized operation.

• Can be connected to compatible key switches, push buttons, timers, or control relays.

• Allows integration with building access control equipment.

• Electrical power supply is sold separately.

Heavy-Duty Solenoid Locking Mechanism

• Continuous-duty solenoid operates the locking bolt.

• 5/8-inch diameter deadbolt.

• 5/8-inch bolt projection.

• Positive mechanical locking when energized and properly aligned.

• Designed for commercial and institutional locking applications.

Compact Surface-Mounted Design

• Compact body suitable for narrow-stile openings.

• Molded aluminum protective housing.

• Surface-mounted installation reduces the need for extensive door modifications.

• Suitable for compatible wood and metal door assemblies.

• Designed for installation on different door configurations using the appropriate keeper.

Multiple Strike and Keeper Options

The Alarm Lock 103 includes three keeper configurations to accommodate installation requirements.

Angle Keeper

• Designed for applications requiring an angled receiving bracket.

• Suitable for certain outswinging door configurations.

Flush Keeper

• Provides a flat mounting configuration.

• Suitable for installations with compatible door and frame surfaces.

Mortise Keeper

• Installs recessed into an appropriately prepared wooden frame.

• Provides a flush receiving surface for the deadbolt.

Each keeper arrangement uses the appropriate magnetic component to allow proper lock operation.

Remote Locking and Unlocking

The Model 103 can be controlled through compatible external electrical devices, including:

• Remote push-button switches

• Key-operated switches

• Time clocks and programmable timers

• Access control relay outputs

• Building automation contacts

• Appropriately designed emergency release circuits

Remote control enables authorized personnel to unlock a secured door without directly operating the deadbolt.

Automatic Door Scheduling

When connected to an appropriate programmable timer, the Alarm Lock 103 can provide scheduled locking and unlocking.

For example, a commercial lobby or service entrance may be programmed to lock after business hours and unlock at the beginning of the next operating period.

Automatic operation depends on the connected timer, power supply, and switching equipment.

Technical Specifications

Specification	Details
Manufacturer	Alarm Lock
Product Series	Lektrolok
Manufacturer Part Number	103
Product Type	Electric Deadbolt Lock
Locking Function	Fail-Safe
Operating Voltage	24V AC or DC
Locking Operation	Power to Lock
Unlocking Operation	Power Removed
Locking Mechanism	Continuous-Duty Solenoid
Deadbolt Diameter	5/8"
Deadbolt Projection	5/8"
Assembly Width	1-3/4"
Assembly Length Including Keeper	6-3/4"
Finish	Painted Aluminum
Housing	Molded Aluminum
Installation	Surface Mount
Door Application	Commercial / Narrow Stile
Strike Configurations	Angle, Flush, Mortise
Magnetic Actuation	Magnet and Reed Switch
Remote Operation	Supported
Power Supply Included	No
Control Switch Included	No
Integrated Audible Alarm	No
Selling Unit	Each

How the Alarm Lock 103 Works

1. Electrical Power Applied

When the appropriate 24V AC/DC power is supplied and the keeper magnet is correctly aligned with the internal reed switch, the solenoid operates and projects the deadbolt.

2. Door Locked

The deadbolt extends approximately 5/8 inch into the keeper, securing the opening.

3. Remote Release Activated

A connected push button, key switch, timer, or compatible electrical contact interrupts power to the lock.

4. Automatic Deadbolt Retraction

When power is interrupted, the solenoid releases and the deadbolt retracts, unlocking the door.

5. Automatic Relocking

When the control circuit restores power and the door and keeper are correctly aligned, the deadbolt projects again to secure the opening.

This design provides convenient electronically controlled locking without requiring manual operation of the deadbolt.

Typical Commercial Applications

Commercial Office Buildings

• Lobby entrances

• Employee entrances

• Service doors

• Controlled interior openings

Retail Stores and Shopping Centers

• Storefront entrances

• Rear service doors

• Restricted access areas

• Scheduled locking applications

Warehouses and Distribution Centers

• Restricted storage rooms

• Warehouse service entrances

• Employee access doors

• Controlled receiving areas

Apartment and Commercial Properties

• Common-area entrances

• Laundry rooms

• Shared service facilities

• Unattended entrances

Educational and Institutional Facilities

• Administrative areas

• Maintenance entrances

• Restricted service rooms

Industrial Facilities

• Controlled access doors

• Service entrances

• Secure equipment areas

• Automated access applications

All installations must be evaluated for suitability under applicable building and life safety codes.

Included Components

The Alarm Lock 103 assembly includes:

• Alarm Lock Model 103 electric deadbolt mechanism

• Molded aluminum lock cover

• Continuous-duty solenoid assembly

• 5/8-inch locking bolt

• Angle keeper

• Flush keeper

• Mortise keeper

• Corresponding keeper magnets

• Manufacturer installation instructions

Note: External power supply, release buttons, key switches, timers, and access control equipment are sold separately.

Installation Information

The Alarm Lock 103 is designed for surface mounting on compatible door and frame assemblies.

The manufacturer recommends mounting the lock on the door frame whenever practical to simplify electrical wiring.

Important Installation Requirements

1. Lock Positioning

Mount the lock and keeper so that the deadbolt aligns correctly with the keeper opening.

2. Magnetic Alignment

The keeper magnet must be positioned opposite the internal reed switch. The deadbolt will not project properly unless the magnet and reed switch are correctly aligned.

3. Door Clearance

The manufacturer specifies a 1/8-inch gap between the face of the lock and the keeper for the installation arrangement described in its instructions.

4. Electrical Wiring

Use appropriate wiring and a compatible 24V AC/DC power source.

For Model 103, the installation instructions show normally closed release switches connected in series.

5. Vertical Installation

When mounting the device with the plunger facing downward, the manufacturer provides specific instructions for changing the solenoid return spring.

6. Functional Testing

Verify proper operation of the locking bolt, magnetic alignment, electrical release controls, and required emergency release systems before placing the installation into service.

Important Life Safety Information

The Alarm Lock 103 is a fail-safe electric deadbolt, but fail-safe electrical operation alone does not establish compliance with emergency egress requirements.

When installed on a required means-of-egress door, the complete system must meet applicable building, fire, accessibility, and electrical requirements. Appropriate emergency release controls and fire alarm connections may be required.

Installation by a qualified commercial door hardware or access control professional is recommended.

Model 103 vs. Model 104RA

Feature	Model 103	Model 104RA
Operating Voltage	24V AC/DC	24V AC/DC
Locking Function	Fail-Safe	Fail-Secure
Power Applied	Locked	Unlocked
Power Removed	Unlocked	Locked
Bolt Diameter	5/8"	5/8"
Bolt Projection	5/8"	5/8"

The Alarm Lock 103 is intended for applications requiring the bolt to retract when power is removed. The Alarm Lock 104RA provides reverse-action, fail-secure operation.

Why Choose the Alarm Lock 103?

The Alarm Lock 103 Lektrolok Electric Deadbolt offers a durable and versatile locking solution for commercial applications requiring electronically controlled door security.

Its compact aluminum housing, continuous-duty solenoid, multiple keeper configurations, and fail-safe operation make it a practical choice for narrow-stile doors, commercial entrances, and automated locking systems.

Whether controlled by a remote release button, keyed switch, or programmable timer, the Alarm Lock 103 provides dependable electric locking functionality for appropriately designed commercial door systems.