What Is the Difference Between Fail-Safe and Fail-Secure Automatic Door Locks?

The difference between a prueba de fallos y fail-secure automatic door locks is the lock’s response when electrical power is lost:

A fail-safe lock unlocks or releases when power is removed.
A fail-secure lock remains locked on the access side when power is removed.

Fail-safe prioritizes release and access continuity, while fail-secure prioritizes protection against unauthorized entry. Neither configuration is universally better. The correct choice depends on the door’s function, emergency-egress requirements, fire strategy, security risk, access-control architecture, backup power, and locally adopted codes.

One point is especially important:

Fail-safe and fail-secure normally describe the condition of the secure or access side of a door—not whether occupants can exit from inside.

A properly configured fail-secure electric strike or electrified lock can keep the exterior side locked during an outage while still providing mechanical free egress through an inside lever or exit device.

Fail-Safe vs. Fail-Secure at a Glance

The power-loss state is the primary distinction, but it affects several parts of the door and access-control strategy.

Característica	Fail-Safe Lock	Fail-Secure Lock
State when power is removed	Unlocks or releases	Remains locked on the access side
Typical electrical logic	Power to lock	Power to unlock
Primary priority	Release, passage, or life-safety strategy	Perimeter or restricted-area security
Power consumption	Often continuously powered while locked	Often powered only during release, depending on design
Outage result	Access control at that opening may be lost	Unauthorized entry remains restricted
Interior egress	Must be evaluated as part of the assembly	Can remain mechanically available
Common examples	Electromagnetic locks and some electrified locksets	Many electric strikes and electrified locksets
Aplicaciones típicas	Selected egress, re-entry, and emergency-release openings	Exterior, storage, server-room, and restricted-area doors
Main risk	Door may become accessible during an outage	Authorized entry may require backup power or mechanical override

These are general tendencies. The exact operating sequence must be confirmed from the manufacturer’s wiring diagram and technical data.

What Do “Fail-Safe” and “Fail-Secure” Mean?

The words can be misleading because safe sounds better than secure. In access control, however, they describe two different electrical operating modes rather than overall product quality.

What is a fail-safe lock?

A fail-safe lock depends on electrical power to maintain its locked condition.

Its simplified operating logic is:

1、Power applied → Door locked

2、Power removed → Lock releases

Power may be intentionally removed by:

An authorized credential
A request-to-exit device
A fire-alarm signal
An emergency release button
An access-control command
A building-management system
A loss of mains power
A failed power supply
A disconnected or damaged cable

An electromagnetic lock is the clearest example. The magnet generates holding force while energized. When power disappears, the magnetic holding force disappears as well.

Fail-safe behavior can support emergency release, but it also creates a security consideration: unless backup power or another locking method is provided, a power failure may leave the access side unlocked.

What is a fail-secure lock?

A fail-secure lock remains locked on the access side without electrical power.

Its simplified operating logic is:

No power → Access side locked

Power applied → Access side temporarily unlocked

A fail-secure electric strike, for example, may use a powered solenoid to release its keeper. If power fails, the keeper remains secured and continues to retain the latchbolt.

Fail-secure behavior helps maintain perimeter or restricted-area protection during a blackout. However, authorized users may need one of the following to enter:

Anulación mecánica mediante llave
Battery-backed access control
Emergency power
Generator power
A separate approved entrance
Manual intervention by authorized personnel

Which side does the terminology describe?

Fail-safe and fail-secure normally describe the secure side, also called the:

Access side
Key side
Outside side
Locked side

They do not automatically describe operation from the egress side.

For example, a fail-secure electrified mortise lock may keep the outside lever locked without power while the inside lever mechanically retracts the latch at all times.

This distinction can be summarized as:

Entry behavior and egress behavior are related, but they are not the same specification.

What Happens During a Power Failure?

Power failure should be considered as a complete system event—not merely a lock event. The lock, controller, reader, sensors, fire-alarm interface, network equipment, and backup power may all behave differently.

Fail-safe sequence

During normal operation:

The power supply energizes the lock.
The lock remains secured.
A valid credential or release signal interrupts power.
The lock releases.
The door opens.
Power is restored and the door relocks after closing.

During a power failure:

Electrical power is interrupted.
The lock releases.
The door may remain physically closed but is no longer electrically secured.
Access-control monitoring may continue only if the controller and sensors have backup power.
The opening returns to controlled operation when power is restored, subject to system programming.

A released lock does not necessarily mean the door swings open. A door closer may keep it closed, and a separate mechanical latch may still operate depending on the hardware design.

Fail-secure sequence

During normal operation:

The door remains locked on the access side.
A valid credential sends a release signal.
Power operates the strike, lever, latch, or actuator.
The authorized user opens the door.
The hardware returns to its locked condition after the release period.

During a power failure:

The controller or power supply loses power.
The lock remains secured on the access side.
Interior mechanical egress may remain available.
Authorized exterior entry may require a key or backup-power system.
Access-control logging and remote release may be unavailable unless the system is backed up.

What happens when power returns?

Power-restoration behavior should be defined during system design and commissioning.

Questions to resolve include:

Does a fail-safe lock relock immediately?
Must the access controller reboot first?
Is door position checked before relocking?
Does the controller retain schedules and permissions?
Is a manual reset required after a fire alarm?
Will a motorized lock automatically return to its previous state?
Are alarms generated for doors that remain open?
Does the system create an audit event for the outage?

An unexpected relocking sequence can create operational or safety problems. It should be tested, documented, and included in staff training.

Does Fail-Secure Mean People Cannot Exit?

No. This is one of the most common misunderstandings in electrified door hardware.

A fail-secure device can maintain security against outside entry while an occupant exits through:

A mechanically operable inside lever
Panic hardware
Fire-exit hardware
A push pad
An approved mechanical release
Another code-compliant egress arrangement

For example, consider a fail-secure electric strike paired with a mechanical mortise lock:

From outside, the strike controls whether the latch can pass through the keeper.
From inside, the lever mechanically retracts the latch.
If power fails, the strike remains locked against entry.
The inside lever can still allow egress.

The complete assembly—not the term fail-secure—determines whether egress is available.

Special locking arrangements

Some systems do not provide ordinary mechanical free egress and may be subject to additional requirements. Examples can include:

Cerraduras electromagnéticas
Delayed-egress locking systems
Controlled-egress systems
Sensor-release locks
Certain institutional locking arrangements
Access-controlled elevator-lobby doors
Special-purpose security doors

These systems may require specific release devices, signage, alarm interfaces, time delays, emergency controls, or approval by the authority having jurisdiction.

Does Fail-Safe Automatically Make a Door Code-Compliant?

No. A fail-safe product can still be installed in a noncompliant system.

For example, an electromagnetic lock may release when power is removed, but the opening may also require:

A listed sensor that detects an approaching occupant
A request-to-exit switch
Direct interruption of lock power
A clearly identified manual release device
Fire-alarm or sprinkler-system interface
Release upon loss of power
Correct emergency-unlock timing
Required signage
Compliant mounting height
Suitable emergency-power logic

Requirements depend on the locking arrangement, occupancy, door location, adopted code, and local enforcement.

A fail-safe label answers only one question:

What happens to the electrical lock when its power is removed?

It does not establish that the complete door assembly provides compliant egress.

Common Types of Electrified Door Locks

Several lock categories may be available in fail-safe, fail-secure, or product-specific configurations.

Cerraduras eléctricas

An electric strike is installed in the frame, inactive leaf, or mullion. Its keeper controls whether the latchbolt can pass through the strike.

Electric strikes are commonly available as:

A prueba de fallos
A prueba de fallos
Field-selectable
Fire-rated or non-fire-rated configurations
Standard or monitored models

Potential advantages include:

Compatibility with existing mechanical locksets
Continued mechanical operation of the inside lever
Relatively straightforward retrofit installation
Low power consumption in many fail-secure configurations
Availability of latch and door monitoring options

Compatibility must be checked for the latch type, preload, door handing, frame material, fire rating, and required egress function.

Electrified mortise locks

An electrified mortise lock integrates an electrical actuator into a mortise lock case.

Depending on the model, power may control:

Outside lever locking
Outside lever unlocking
Retroceso del pestillo
Deadbolt monitoring
Request-to-exit output
Door or latch status

A common arrangement keeps the inside lever mechanically operable while electrically controlling the outside lever.

Electrified mortise locks are often used in:

Commercial offices
Hoteles
Universities
Centros sanitarios
Government buildings
High-traffic institutional openings

Electrified cylindrical locks

The electrified cylindrical locks use a bored-lock chassis and electrically control the outside lever or another internal function.

They can be suitable for:

Oficinas
Storerooms
Classrooms
Puertas interiores con control de acceso
Light-to-heavy commercial applications

Buyers should verify duty cycle, voltage, current draw, handing, door preparation, monitoring options, and emergency mechanical operation.

Cerraduras electromagnéticas

An electromagnetic lock uses an energized magnet and an armature plate to hold the door closed.

Its typical behavior is:

Power present: magnet produces holding force
Power removed: holding force disappears

For this reason, electromagnetic locks are generally associated with fail-safe operation.

Their advantages can include:

No conventional latch engagement
High advertised holding force
Simple electrical release
Suitability for selected glass or architectural doors

Important design concerns include:

Mandatory release methods
Fire-alarm interface
Request-to-exit logic
Alineación de puertas
Residual magnetism
Door-position monitoring
Correct armature installation
Backup-power strategy
Egress-code compliance

Holding force alone does not determine whether a magnetic-lock installation is secure or compliant.

Dispositivos de salida electrificados

Exit devices may use electrical options such as:

Electric latch retraction
Electrified outside trim
Alarmed exit
Request-to-exit monitoring
Delayed egress
Remote dogging, where permitted
Motorized latch retraction

The fail-safe or fail-secure state depends on which component is electrified and how the device is configured. The push pad may continue to provide mechanical egress even if outside access remains locked.

Motorized and smart locks

Motorized locks use an electric motor or geared actuator rather than relying only on a solenoid or magnet.

They may include:

Funcionamiento con batería
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Thumbturn override
Remote access
Credenciales móviles
Cloud management
Lock-state monitoring
Low-battery warnings
Automatic relocking

For these products, a prueba de fallos y fail-secure may not fully describe every failure mode. Buyers should ask what happens during:

Mains-power loss
Battery depletion
Network loss
Controller failure
Motor failure
Credential-reader failure
Firmware malfunction
Fire-alarm activation

A battery-powered smart lock may remain mechanically locked when its battery is depleted but lose electronic credential processing. That behavior should not be assumed; it must be verified for the exact model.

When Should You Choose a Fail-Safe Lock?

A fail-safe lock should be considered when automatic release during power loss is part of the building’s safety or operational strategy.

Typical fail-safe priorities

Fail-safe may be appropriate when:

Electrical locking must release when power is lost
Emergency responders require automatic access
The door must unlock upon a fire-alarm signal
Emergency passage is more important than maintaining exterior security
The application uses an electromagnetic lock
A stairwell re-entry strategy requires remote unlocking
The adopted code requires the electrical locking function to release

Potential applications

Depending on the approved design, fail-safe hardware may be considered for:

Selected stairwell doors
Certain internal circulation doors
Some healthcare or controlled-egress applications
Public entrances that must release in an emergency
Access-controlled doors connected to a fire-alarm system
Doors using electromagnetic locking systems

These are examples, not universal rules. A stairwell, hospital, or public entrance can contain several door functions with different requirements.

Advantages of fail-safe operation

Automatically releases if lock power is lost
Can support emergency-access strategies
Integrates naturally with fire-alarm release
Avoids dependence on powered unlocking during an outage
May simplify certain emergency-unlock sequences

Limitations of fail-safe operation

Can leave a perimeter or restricted area unsecured
Often requires continuous power to remain locked
May increase power consumption and heat generation
Can depend heavily on battery backup for security continuity
Damaged wiring may cause unintended release
May require additional monitoring and alarm functions

A fail-safe lock should therefore be paired with a realistic security plan for outages and cable faults.

When Should You Choose a Fail-Secure Lock?

Fail-secure is generally preferred when unauthorized entry must remain restricted during a power outage.

Typical fail-secure priorities

Consider fail-secure when:

The door protects assets or sensitive information
Perimeter security must remain during outages
The outside must stay locked if the controller fails
A mechanical inside lever or exit device provides free egress
Authorized staff can use mechanical key override
Backup power is available for continued credential access

Potential applications

Fail-secure hardware is commonly considered for:

Commercial exterior doors
Almacenes
Salas de servidores
Data centers
Records rooms
Pharmaceutical storage
Cash-handling areas
Staff-only offices
Restricted laboratories
Residential smart-lock entrances
Utility and equipment rooms

Advantages of fail-secure operation

Maintains access-side security without electrical power
Reduces the risk of an outage automatically opening the perimeter
Often consumes power only during authorized release
Can operate with mechanical free egress
Can be combined with key override or emergency power

Limitations of fail-secure operation

Electronic entry may stop during a power failure
Emergency responders may require an alternative access method
Backup power may be necessary for business continuity
Poorly designed configurations can create egress hazards
Staff can be locked out if no mechanical override exists
Remote unlocking may be unavailable when the controller is offline

Fail-secure should never be interpreted as permission to trap occupants. Egress remains a separate and essential requirement.

Security, Egress, Fire Safety, and Access Control

Choosing the correct mode requires balancing four different objectives.

Seguridad

From an unauthorized-entry perspective, fail-secure often has an advantage during an outage because it remains locked on the access side.

However, overall security also depends on:

Door and frame strength
Lock construction
Strike reinforcement
Seguridad de las credenciales
Reader protection
Wiring protection
Controller location
Door-position monitoring
Forced-door alarms
Mechanical key control
Ciberseguridad
Backup power

A fail-secure lock installed in a weak frame is not a secure opening. Similarly, a fail-safe lock with monitored backup power may provide better overall security than a poorly designed fail-secure system.

Emergency egress

Egress design should answer:

Can an occupant exit without a key?
Is special knowledge required?
Is more than one releasing operation required?
Is panic hardware required?
Does the egress function remain available during power loss?
Does the fire alarm affect the lock?
Is manual emergency release required?
Is delayed egress permitted at this location?
Does the door release in the correct direction?

Most conventional fail-secure electric strikes and electrified locksets can preserve mechanical egress. Magnetic locks and special locking arrangements require additional attention because the lock may directly prevent opening until electrically released.

Fire safety

Fail-safe, fail-secure, and fire-rated are separate concepts.

Fail-safe or fail-secure: describes electrical behavior during power loss.
Fire-rated: describes suitability within a tested or listed fire-door assembly.
Free egress: describes how occupants can leave.
Positive latching: describes whether the door remains latched as required.
Fire-alarm release: describes how the access-control system responds to an alarm.

A fire door may need to unlock for egress while still closing and positively latching to resist the spread of fire and smoke.

Therefore, unlocking does not necessarily mean:

Holding the door open
Retracting the latch indefinitely
Disabling the closer
Preventing positive latching

The lock, latch, closer, exit device, wiring, and alarm interface must operate as a coordinated assembly.

Access control

The access-control system may include:

Lector de credenciales
Door controller
Lock power supply
Fire-alarm interface
Request-to-exit sensor
Door-position switch
Latch monitor
Emergency release
Network connection
Management software
Batería de reserva
Mechanical override

The lock’s fail mode should align with the controller’s relay logic and power-supply design. Incorrect use of normally open and normally closed circuits can reverse the intended behavior—a tiny wiring detail with a very large personality.

Application-Based Selection Guide

Different doors in the same building may require different modes.

Solicitud	Typical Direction	Main Considerations
Commercial exterior entrance	Often fail-secure	Perimeter protection, key override, backup power
Interior office door	Either	Security level, free egress, operating schedule
Server or data room	Often fail-secure	Outage security, monitoring, emergency access
Warehouse entrance	Often fail-secure	Asset protection, exterior access, mechanical override
Stairwell door	Project-specific	Re-entry, remote unlocking, adopted code
Fire-rated exit door	Project-specific	Listing, positive latching, egress, alarm interface
Hospital department	Door-specific	Patient safety, staff security, controlled egress
Pharmacy or medication room	Often fail-secure	Restricted access and auditability
Hotel guestroom	Product-specific	Battery behavior, mechanical override, fire requirements
Hotel stair or exit door	Project-specific	Re-entry, egress, fire strategy
School classroom	Door-specific	Lockdown, emergency egress, staff access
Residential entrance	Often secure on battery failure	Key or thumbturn override, low-battery warning
Glass entrance with maglock	Usually fail-safe	Emergency release and code-compliant egress
High-security facility	Engineered solution	Threat assessment, redundancy, monitoring, code

These are common design tendencies—not substitutes for an approved hardware schedule.

Choosing by Building Type

A single building can legitimately use both fail-safe and fail-secure locks.

Commercial offices

Commercial buildings often use:

Fail-secure perimeter entrances
Fail-secure server and records rooms
Electrified locksets with mechanical inside egress
Selected fail-safe magnetic locks
Fire-alarm-linked emergency release

The hardware should be scheduled door by door according to function and risk.

Centros sanitarios

Healthcare environments can contain:

Public entrances
Patient rooms
Pharmacies
Infant-care areas
Behavioral-health spaces
Staff-only rooms
Operating areas
Emergency departments
Stairwells

A pharmacy may prioritize fail-secure protection, while a selected circulation or controlled-egress opening may require a different emergency response. Patient safety, staff intervention, and specialized egress rules must be evaluated.

Hoteles

Hotel access systems may include:

Battery-powered guestroom locks
Fail-secure staff-area locks
Electrified service entrances
Fire-rated stair doors
Public entrances with automatic operators
Emergency-release interfaces

Guestroom locks require careful battery-management and mechanical-override procedures. Stair and exit doors require separate life-safety evaluation.

Schools and universities

Educational facilities may need:

Classroom security
Lockdown functions
Free egress
Staff key override
Monitored exterior entrances
Stairwell re-entry
Fire-alarm integration

Lockdown objectives must not override required emergency egress.

Warehouses and industrial buildings

Fail-secure hardware is often preferred for:

Exterior doors
Inventory areas
Tool rooms
Control rooms
Utility spaces
Restricted production areas

High traffic, dust, temperature, vibration, and door misalignment should be included in product selection.

Residential and multifamily buildings

Smart residential locks may use batteries instead of a continuously powered access-control circuit. Buyers should verify:

Low-battery warning period
State after complete battery depletion
Exterior emergency-power terminals
Anulación mecánica mediante llave
Interior thumbturn operation
Remote-access behavior during network loss
Auto-lock timing
Fire and egress requirements for the building type

The marketing term smart lock does not explain its failure behavior. The operating sequence still matters.

How Backup Power Changes the Decision

Backup power can maintain access-control operation during an outage, but it does not change the lock’s inherent fail mode after backup power is exhausted.

Common backup-power options

Local rechargeable battery
Access-control power-supply battery
Uninterruptible power supply
Central emergency-power system
Building generator
Redundant power supplies

Questions to ask

How long must the system operate during an outage?
What is the total current draw?
Are locks powered continuously or only during release?
Are controllers, readers, and network switches also backed up?
Is the fire-alarm interface backed up?
What happens when the battery reaches low voltage?
Is battery health monitored?
How often are batteries tested and replaced?
Does emergency power alter fire-alarm release behavior?

A fail-safe magnetic lock may consume power continuously, affecting required battery capacity. A fail-secure strike may use less energy but still need backup power if credentials must continue working during an outage.

Electrical and Technical Specifications to Compare

B2B buyers should review more than the fail mode.

Voltage and current

Common product inputs may include:

12 VDC
24 VDC
Dual-voltage operation
Product-specific AC supply

Verifícalo:

Holding current
Activation current
Inrush current
Continuous-duty rating
Power-supply capacity
Voltage drop over cable distance
Polarity requirements
Surge suppression

An undersized power supply or excessive voltage drop can produce intermittent unlocking, coil overheating, or unreliable relocking.

Duty rating

Ask whether the solenoid or actuator is suitable for:

Intermittent duty
Continuous duty
High-frequency operation
Extended energized periods

A component intended for momentary release may overheat if continuously powered.

Monitoring outputs

Useful monitoring functions include:

Door-position status
Latchbolt status
Deadbolt status
Request-to-exit
Lock status
Tamper status
Power status

Monitoring allows the system to distinguish between a valid access event and a door that has been forced or held open.

Rendimiento medioambiental

Confirm:

Operating temperature
Humidity limits
Outdoor suitability
Ingress protection
Corrosion resistance
Dust resistance
Condensation protection
Use in washdown or coastal environments

Mechanical compatibility

Compruébalo:

Door and frame material
Door handing and swing
Latchbolt dimensions
Strike preparation
Preload tolerance
Door sag and alignment
Exit-device compatibility
Fire-rating restrictions
Required door gap
Faceplate dimensions

Electrical compatibility cannot rescue incorrect mechanical preparation. The lock still has to fit the door—a stubbornly physical requirement in an increasingly digital world.

Fire and Life-Safety Standards

Commercial specifications should identify the applicable code, standard edition, product listing, and jurisdiction.

ANSI/BHMA electrified hardware standards

The ANSI/BHMA standards cover relevant categories of electrified locking hardware and performance testing. ANSI/BHMA A156.41 is commonly referenced in relation to door-hardware electrified locking devices.

Before citing a grade or compliance claim, verify:

Exact standard title
Current edition
Exact product category
Tested model
Test report or certification
Applicable function and configuration

A family-level claim should not be assumed to cover every voltage, monitoring option, faceplate, or fail-mode configuration.

International Building Code

En 2024 International Building Code includes provisions relevant to:

Vías de evacuación
Electrically locked doors
Sensor-release systems
Door-hardware release
Stairway doors
Accesibilidad
Fire and smoke protection

The applicable section depends on the exact locking arrangement and door function.

NFPA 101

NFPA 101, Life Safety Code, addresses life-safety strategies for new and existing structures, including means-of-egress considerations.

The NFPA source currently identifies the 2024 edition as active. Projects must follow the edition adopted by the relevant jurisdiction, which may differ.

NFPA 80

NFPA 80, Standard for Fire Doors and Other Opening Protectives, addresses installation and maintenance of assemblies used to protect openings against fire and smoke spread.

The NFPA source currently identifies the 2025 edition as active. Again, the legally applicable edition is the one adopted for the project.

Authority having jurisdiction

The authority having jurisdiction may include:

Building department
Fire marshal
Code official
Insurance authority
Government agency
Facility owner’s safety authority

Product selection and installation should be reviewed against the locally adopted requirements. An online article or general selection table cannot approve a specific opening.

Step-by-Step Selection Process

A structured process reduces specification errors and costly field changes.

1. Define the door’s function

Identify whether the opening is primarily:

An entrance
An exit
A perimeter door
An internal access-control point
A stairwell door
A fire-rated opening
A restricted-room entrance
A residential entrance
A controlled-egress door

2. Define the required power-loss state

Ask:

If all normal and backup power disappears, should the access side unlock or remain locked?

Choose a fail-safe direction when automatic release is required.
Choose a fail-secure direction when exterior security must remain.

This preliminary decision must still be checked against egress and fire requirements.

3. Define interior egress

Specify exactly how occupants exit during:

Normal operation
Access-control failure
Power failure
Fire alarm
Emergency lockdown
Network failure

Do not rely on assumptions about the fail mode.

4. Identify the door and hardware type

Record:

Material de la puerta
Frame material
Single or double door
Sentido de apertura de la puerta
Resistencia al fuego
Tipo de cierre
Latch or exit device
Automatic operator
Door closer
Existing preparation

5. Select the electrified device

Compara:

Electric strike
Electrified mortise lock
Electrified cylindrical lock
Electromagnetic lock
Electrified exit device
Motorized lock
Smart battery-powered lock

The best device depends on security, egress, installation, traffic, aesthetics, and maintenance.

6. Design the control sequence

Document what happens when:

A valid credential is presented
An invalid credential is presented
The request-to-exit device activates
The fire alarm activates
Normal power fails
Backup power expires
A door is forced
A door is held open
The controller goes offline
Power is restored

A written sequence of operations is one of the most useful documents in an access-control project.

7. Confirm backup access

For fail-secure doors, provide an appropriate method such as:

Mechanical key cylinder
Emergency power
Batería de reserva
Generator supply
Secure key box where approved
Staffed alternative entrance

8. Verify listings and standards

Check the exact hardware combination, including:

Lock
Strike
Exit device
Door and frame
Fuente de alimentación
Release device
Fire-alarm interface
Automatic operator
Sensors and controls

9. Obtain regulatory approval

Coordinate with the project’s architect, security consultant, fire-protection engineer, code consultant, and authority having jurisdiction.

10. Test and commission the opening

Test at minimum:

Valid and invalid credentials
Mechanical egress
Anulación mecánica mediante llave
Mains-power loss
Backup-power depletion
Fire-alarm release
Emergency-release button
Door-held-open alarm
Forced-door alarm
Power restoration
Automatic relocking
Controller and network failure

Document results for facility management and future maintenance.

Common Specification Mistakes

Several errors occur repeatedly in access-control projects.

Mistake 1: Assuming fail-secure prevents egress

Fail-secure usually describes access-side behavior. A mechanical inside lever or exit device can still provide free egress.

Mistake 2: Assuming fail-safe guarantees compliance

Fail-safe behavior does not replace required release devices, alarm interfaces, listings, signage, or approved egress hardware.

Mistake 3: Using one mode throughout the building

A server room, public entrance, pharmacy, stair door, and fire exit have different priorities. Specify each opening by function.

Mistake 4: Ignoring total power failure

Designers sometimes consider mains failure but overlook depleted batteries, failed generators, damaged wiring, or controller shutdown.

Mistake 5: Forgetting mechanical override

A fail-secure door without backup power or mechanical entry can prevent authorized access during an extended outage.

Mistake 6: Confusing unlock with unlatch

Some devices unlock a lever, while others retract a latch or release a keeper. These actions produce different operating results.

Mistake 7: Ignoring positive latching on fire doors

Releasing access control must not unintentionally defeat required closing and latching functions.

Mistake 8: Selecting by holding force alone

A high holding-force claim does not establish door compatibility, egress compliance, frame strength, or complete-opening security.

Mistake 9: Omitting the power-restoration sequence

Immediate or uncontrolled relocking after an outage can create operational problems.

Mistake 10: Treating software status as physical lock status

A controller may report “locked” even if the door has not closed or the latch has not engaged. Door-position and latch monitoring provide better verification.

B2B RFQ Checklist

The following information helps AKADASMART prepare an accurate technical proposal.

Category	Information to Provide
Building	Occupancy type, country, jurisdiction, and project stage
Door	Material, size, handing, swing, frame, and fire rating
Function	Entrance, exit, perimeter, stair, restricted room, or controlled egress
Fail mode	Required state during mains and total power failure
Egress	Lever, push pad, panic hardware, sensor release, or other arrangement
Tipo de cierre	Strike, mortise, cylindrical, magnetic, motorized, or smart lock
Método de acceso	Card, PIN, mobile, biometric, key, or mixed credentials
Potencia	Voltage, power supply, UPS, battery, generator, and required runtime
Integration	Fire alarm, automatic operator, BMS, intercom, and access controller
Monitoring	Door position, latch status, request to exit, and tamper detection
Medio ambiente	Interior, exterior, temperature, humidity, corrosion, and ingress
Compliance	Required standards, listings, code edition, and approval authority
Comercial	Quantity, drawings, samples, packaging, and delivery schedule

A Practical Decision Matrix

This matrix provides a preliminary selection direction. It does not replace code review.

Requirement	Fail-Safe	Fail-Secure
Unlock automatically when lock power is lost	✓
Maintain exterior security during power loss		✓
Typical electromagnetic-lock operation	✓
Typical restricted-room strategy		✓
Mechanical free egress can be provided	✓	✓
Fire-alarm release can be integrated	✓	Product and application dependent
Continuous power commonly required to stay locked	✓	Usually not
Mechanical override especially important	Useful	Strongly recommended
Backup power needed for continued credential access	Often	Often
Suitable for every exit door by default
Suitable for every fire door by default

The absence of a checkmark does not mean a configuration is impossible. It means the system requires product-specific engineering and regulatory review.