Choosing the right lock for an access control system is not just a technical detail. It affects security, safety, compliance, and how a door behaves when power is lost. For installers, electricians, and locksmiths, one of the most important decisions is whether a door should use a fail safe vs fail secure lock setup.
Get this wrong and you can create real problems. A door might unlock when it should stay secure. Or it might stay locked when safe escape is needed. That is why understanding the difference matters on every project, from office doors and communal entrances to stock rooms, fire exits, and gates.
This guide explains what fail safe and fail secure mean, why the distinction matters, which products usually fall into each category, and how to choose the right option for different building types. It also covers power failure scenarios, because that is where the choice really shows its importance.
What Does Fail Safe Mean?
A fail safe lock unlocks when power is removed.
In simple terms, the door is secure while power is present, but if the power fails, the lock releases. This is commonly used where safe escape is the priority.
How a Fail Safe Lock Works
A fail safe lock relies on electrical power to stay locked. Once power is interrupted, the locking action stops and the door can be opened.
This is often the preferred option for:
- fire escape routes
- controlled exits
- communal doors with life safety requirements
- buildings where people must be able to leave quickly in an emergency
Common Examples of Fail Safe Locking
Typical fail safe products include:
- many magnetic locks
- some electric lock releases designed for escape routes
- certain access-controlled doors connected to emergency release systems
You can explore relevant products here:
What Does Fail Secure Mean?
A fail secure lock stays locked when power is removed.
This means the lock continues to secure the door during a power cut. The door will not automatically release just because electrical power has failed.
How a Fail Secure Lock Works
A fail secure lock uses power to unlock, not to stay locked. When power is lost, the lock returns to its secure state.
This is often used where security is more important than automatic release during a power outage.
Common Examples of Fail Secure Locking
Typical fail secure products include:
- many electric strikes
- electric lock releases used on secure internal doors
- doors where unauthorised access must be prevented during power loss
If you are comparing options, browse:
Why the Fail Safe vs Fail Secure Lock Choice Matters
The difference between these two lock types affects much more than the hardware itself. It changes how the whole door behaves in normal use and in emergencies.
Safety and Escape
On doors that form part of an escape route, a fail safe vs fail secure lock decision can have direct safety implications. If people need to exit quickly, the lock must support that safely.
Security During Power Loss
Some doors protect stock, equipment, private records, or restricted areas. On these doors, a fail secure setup may be more suitable because it keeps the area protected if power fails.
Compliance and System Design
The correct choice often depends on:
- the purpose of the door
- the building’s fire strategy
- whether the door is on an escape route
- who uses the building
- what happens if power is lost
This is why installers should treat the lock choice as part of the full system design, not as a stand-alone product decision.
Common Fail Safe Products
Certain locking products are more commonly used in fail safe applications.
Magnetic Locks as Fail Safe Devices
Most magnetic locks are fail safe by design. They need constant power to remain locked. Remove the power and the magnet releases.
That makes maglocks a common choice for:
- access-controlled escape doors
- communal entrances
- office exits
- doors linked to emergency break glass units
- fire alarm integrated systems
Maglocks can be a strong choice where fast release is needed, but they must be installed with the right supporting hardware.
Useful product categories include:
Certain Electric Releases in Fail Safe Mode
Some electric releases are designed to unlock when power is lost. These are used in more specific setups and should always be checked carefully against the door’s requirements.
For trade professionals, the key point is simple: do not assume every electric release is fail secure. Always verify the exact operation of the product.
Common Fail Secure Products
Fail secure locking is widely used where the door must remain protected during a power cut.
Electric Strikes as Fail Secure Devices
Many electric strikes are fail secure. They stay locked without power and only release when the system sends an unlock signal.
These are often used on:
- office entry doors
- store rooms
- plant rooms
- secure staff areas
- restricted internal doors
Electric strikes can work especially well where the door already has a latch or mechanical lockcase and the installer wants controlled release without switching to a maglock.
Electric Lock Releases for Secure Areas
Some electric lock releases are chosen specifically because they maintain security during power failure. This can be useful in areas where protecting the space is more important than automatic unlocking.
That said, the final decision must still consider emergency egress and building safety.
Maglocks vs Electric Strikes: A Practical Comparison
When trade buyers compare lock types, the fail safe vs fail secure lock question often comes down to maglocks versus electric strikes.
When Maglocks Make Sense
Maglocks are often the better fit where:
- fail safe release is required
- the door is on an escape route
- quick release under fire alarm conditions is needed
- the door sees heavy traffic
- simple electromagnetic locking is preferred
When Electric Strikes Make Sense
Electric strikes are often the better fit where:
- fail secure operation is preferred
- the site wants the door to remain secure during power failure
- the door already has a latch lock
- a more mechanical locking arrangement suits the frame and door type
Both solutions have their place. The right answer depends on the door’s role, not just on installer preference.
Which Option Is Best for Fire Exits?
This is one of the most important parts of the topic.
Why Fire Exits Need Careful Lock Selection
Fire exit doors must allow people to leave safely. If a lock could prevent escape in an emergency, the whole setup may become unsafe.
That is why many fire exit applications favour fail safe locking, especially where access control is fitted to the door.
Typical Fire Exit Setup
A controlled fire exit may include:
- a magnetic lock
- an emergency door release
- a break glass unit
- a press to exit device
- a suitable power supply
- fire alarm interface
If the fire alarm activates or power is cut, the door should release in line with the building’s fire and life safety strategy.
For these applications, the following categories are especially relevant:
Important Note on Fire Safety
The correct setup for a fire exit should always be based on the building design, relevant regulations, and competent professional judgement. Access control on escape routes should never be specified casually.
Which Option Is Best for Secure Rooms?
Not every door is part of an escape route. Some are there mainly to keep people out.
When Fail Secure Is Often Preferred
A fail secure setup is often better for:
- stock rooms
- server rooms
- cash offices
- restricted storage
- maintenance cupboards
- back-of-house secure areas
On these doors, the main concern may be preventing unauthorised access during a power cut. In those cases, a fail secure electric strike or lock release can be the more suitable option.
Choosing the Right Lock by Building Type
The best fail safe vs fail secure lock choice often depends on the building and how the door is used.
Offices
Office buildings often need both security and safe movement.
Office Entrances
Main entry doors may use fail secure or fail safe locking depending on whether they serve as escape routes, whether there is a reception, and how the fire strategy is set up.
Internal Office Doors
For meeting rooms, private offices, and internal staff-only areas, fail secure locking is often common where security matters more than automatic release.
Apartment Blocks
Communal residential buildings need careful planning because they involve both residents and visitors.
Communal Entrance Doors
A communal entrance may use a fail secure or fail safe arrangement depending on the full door design, exit requirements, and how the access control system is integrated.
Escape and Shared Routes
If the controlled door is on an escape route, life safety takes priority. In these cases, fail safe operation and emergency release equipment may be required.
Shops and Retail Premises
Retail sites often need separate solutions for front-of-house and back-of-house doors.
Customer Areas
Where public safety is part of the equation, safe exit must always be clear.
Staff and Stock Areas
Store rooms and stock access doors often suit fail secure locking because goods and restricted areas need to stay protected during power loss.
Warehouses
Warehouses often contain a mix of door types, from staff access points to loading and secure storage doors.
Staff Entry Doors
A staff entry might use a fail secure system if site security is the main priority.
Escape Doors
Any warehouse escape route should be assessed carefully. If access control is fitted, fail safe hardware with emergency release arrangements is often more suitable.
Gates
Gate applications can be more complex because they involve external conditions, different locking methods, and varied site risks.
Security-Focused Gates
Many gates are designed to stay secure during power failure, which can point towards fail secure thinking.
Emergency Considerations
If the gate affects safe escape or emergency access, the design must account for that clearly. Never treat gate locking as a simple one-size-fits-all decision.
Power Failure Scenarios Explained
This is where the difference between the two lock types becomes very clear.
What Happens in a Power Cut with a Fail Safe Lock?
If the site loses power, a fail safe lock releases. The door becomes unlocked.
Practical Result
This can be the right outcome where people need to exit without delay. On an escape route, that behaviour may be essential.
Trade Implication
The downside is that security is reduced during the outage. If the door protects a restricted area, that may not be acceptable.
What Happens in a Power Cut with a Fail Secure Lock?
If the site loses power, a fail secure lock remains locked.
Practical Result
This protects the area from unauthorised entry during the outage.
Trade Implication
The risk is that if the door also needs to support safe emergency escape, extra measures may be required. A lock staying secure is not helpful if people need to get out quickly.
Power Supply Design Still Matters
The fail safe vs fail secure lock decision does not remove the need for proper power planning.
Why the Power Supply Matters
A poor or undersized PSU can create faults, unstable lock operation, and nuisance call-outs. The power supply should match:
- the lock type
- current draw
- access control devices
- emergency release hardware
- any battery backup requirement
You can view relevant options in Power Supplies.
Battery Backup and Site Risk
Some sites use backup power to maintain system performance during short outages. Whether that is needed depends on the building, the lock type, and what the client expects the system to do during a failure.
Common Mistakes When Choosing Between Fail Safe and Fail Secure
Even experienced buyers can run into problems if they focus only on the product and not the door’s real function.
Choosing Based on Habit
A lock type that worked well on one project may be wrong for the next one.
Ignoring Escape Requirements
This is one of the biggest mistakes. If the door is on an escape route, that changes the decision.
Assuming All Electric Releases Work the Same Way
They do not. Always confirm whether the product is fail safe or fail secure.
Forgetting the Whole System
The lock, power supply, emergency release hardware, and access control devices all need to work together.
Product Categories to Explore
If you are specifying a system, these Door Entry Online categories are a useful starting point:
FAQs
What is the difference between a fail safe vs fail secure lock?
A fail safe lock unlocks when power is lost. A fail secure lock stays locked when power is lost.
Are maglocks fail safe or fail secure?
Most magnetic locks are fail safe because they need power to stay locked.
Are electric strikes fail safe or fail secure?
Many electric strikes are fail secure, but not all. Always check the product specification before ordering or installing.
Which is better for a fire exit?
In many access-controlled fire exit applications, fail safe locking is more suitable because the door should release safely in an emergency. The full system still needs proper design and compliance checks.
Which is better for a stock room or secure room?
A fail secure lock is often more suitable because it keeps the door locked during a power cut.
Why does power failure matter so much?
Because that is the point when the lock’s default behaviour takes over. If the wrong type is used, the door may become unsafe or insecure when power is lost.
Do I need an emergency door release with a maglock?
In many applications, yes. This is especially common where the maglock is used on escape routes or controlled exits.
Can one building use both fail safe and fail secure locks?
Yes. Many sites use different lock types on different doors depending on whether the priority is escape, access control, or security.
Final Thoughts
The difference between a fail safe vs fail secure lock is simple in theory, but important in practice. A fail safe lock releases on power loss. A fail secure lock stays locked. The right choice depends on the job the door needs to do.
For escape routes and many fire exit applications, fail safe locking is often the safer route. For secure rooms, stock areas, and doors that must stay protected during a power cut, fail secure may be the better option.
For trade professionals, the key is to assess the whole door environment: the building type, the users, the fire strategy, the lock hardware, and the expected behaviour during a power failure. Get those points right and the lock choice becomes much clearer.
