Fail-Safe vs Fail-Secure Electromagnetic Locks: Which One Meets Building Code Requirements?
In access control projects, choosing the right type of lock is not always as straightforward as it seems. One question that comes up frequently is whether to use a fail-safe or fail-secure locking mechanism.
At first glance, the difference is simple. But in practice, it directly affects fire safety compliance, emergency evacuation, and overall system reliability. In some cases, the wrong choice doesn’t just impact performance—it can create real safety risks.
This article will dive into the differences in a practical way and explains how to make the right decision based on actual project requirements.
What is a Fail-Safe Electromagnetic Lock?
A fail-safe lock unlocks when power is removed.
Most electromagnetic locks fall into this category by design. They rely on continuous current to maintain the magnetic force that keeps the door closed. Once the power is cut, the door releases.
That’s exactly why they are widely used on fire exits and emergency doors.
In practice
One issue that installers sometimes run into is that the door doesn’t release as cleanly as expected. This is often caused by residual magnetism, especially in high-frequency use environments.
To avoid this, better-designed maglocks—such as those from YGS—use low residual magnetism design, so the door can release immediately even after long periods of operation. It’s a small detail, but it makes a difference in real situations.
difference in real situations.
What is a Fail-Secure Lock?
A fail-secure lock stays locked when power is lost.
This type is more common in electric bolt locks or mechanical systems.
Power is used to unlock the door, not to keep it locked.
Where it makes sense
Fail-secure is usually used where security matters more than immediate exit, such as:
* server rooms
* storage areas
* restricted internal zones
But there’s a trade-off. If power is lost and there’s no proper override, the door stays locked. That’s why it’s generally not suitable for emergency exits.
Key Differences (What Actually Matters)
| Feature | Fail-Safe | Fail-Secure |
| Power off | Unlocks | Stays locked |
| Priority | Safety | Security |
| Typical use | Public / exit doors | Restricted areas |
| Compliance | Often required | Limited use |
Door locking systems must comply with fire safety and building regulations in most regions.
Key Requirements:
◆ Doors on escape routes must unlock automatically during power failure
◆ Systems must integrate with fire alarms and emergency release devices
◆ Exit must be possible without delay
Common Standards:
*NFPA 101 – Life Safety Code
*UL 294 – Access control system safety
*EN 13637 – Electrically controlled exit systems
These standards emphasize one critical principle: Life safety must always take priority over security.
Commercial Buildings and Offices:
*Fail-safe electromagnetic locks are widely used due to safety compliance requirements and high foot traffic.
Fire Doors and Emergency Exits:
*Fail-safe is mandatory in most cases, ensuring immediate door release during emergencies.
Data Centers and Server Rooms:
*Fail-secure locks may be preferred to maintain security during power loss.
Industrial Facilities:
*A combination of both types is often used depending on access zones.
Choosing the right locking mechanism depends on safety requirements, building function, and compliance standards.
◆Choose fail-safe for emergency exits, fire doors, and public access areas
◆Choose fail-secure for restricted, high-security zones
◆Always check local building codes before selection
◆Ensure system integration with fire alarms and access control
In most commercial projects, using fail-safe electromagnetic locks for safety-critical doors is the most reliable and compliant approach.
When selecting an electromagnetic lock, professionals typically consider:
- Holding force (e.g., 300kg / 500kg)
- Voltage (DC12V / 24V)
- Durability and lifecycle performance
- Environmental resistance (IP rating)
- Certification and compliance support
YGS electromagnetic locks are designed to meet these requirements, offering stable performance, reliable holding force, and adaptability across different applications.
