Fail-Safe vs. Fail-Secure Gate Openers: What Happens When the Power Goes Out
Power outages are an inevitable part of life, and your automatic gate doesn't get a pass. What your gate does in those first few seconds without power depends on whether its locking system is built to fail-safe or fail-secure. Understanding the difference matters for safety, security, and code compliance; and it's one of the most common questions we get from operator owners. This guide explains both concepts, how BFT operators behave by default, and how to ensure your gate does exactly what you want during an outage.
What Fail-Safe and Fail-Secure Mean
Fail-safe (also called fail-open): The gate stays accessible during a power loss. The locking mechanism releases when power is cut, so anyone can push the gate open freely. This is the standard for fire doors and emergency exits, where people must always be able to get out.
Fail-secure (also called fail-closed or fail-lock): The gate stays locked during a power loss. Without power, the lock stays engaged, and you can open the gate only with a manual release key, physical effort, or restored power. This is the default behavior for most security applications.
Why the Distinction Matters
The choice isn't about which option is "better"; it's a trade-off between life safety and security.
Safety codes, fire access, and emergency egress.
Fire codes and emergency egress requirements generally dictate that exit points must remain accessible when power fails. If your gate is part of an egress path or must allow emergency responders in, a fail-secure setup without a backup plan (manual release, battery backup, or free-exit hardware) can create a serious liability. Property owners must ensure people can get out and fire crews can get in, even with the power off.
When fail-secure is the right call.
For high-security and controlled sites, data centers, utilities, distribution yards, government facilities, or any property where an open gate means a real breach, fail-secure is exactly what you want. An outage shouldn't hand strangers access to your property. In these cases, stay fail-secure and add a battery backup and a documented manual-release procedure so authorized people are never stuck.
How We've Classified BFT Products
| Option | Explanation |
|---|---|
| Fail-Secure (Fail-Lock) | Most models because of the solenoid principle requiring power to unlock |
| Fail-Safe (Fail-Open) | Applies to models that are spring-assisted |
| n/a | Applies to fixed bollards, effectively always Fail-Secure |
How Gate Openers Behave by Default
An operator without any backup power stops when the electricity cuts out, and for most systems, that makes them effectively fail-secure. But here's an important nuance: a stalled gate isn't the same as a locked gate. A powered-down operator that's stopped in place still isn't actively locked in many configurations, and an unlocked gate can be pushed open by hand with some effort. That's why a true fail-secure setup (lock engaged, manual release required) and a gate that's merely "stopped" behave differently in an outage.
| Type | Default Behavior | Why |
|---|---|---|
| Manual | Fail-Secure | No power = always locked |
| Electromechanical | Fail-Secure | No power = solenoid de-energizes = lock engages |
| Hydraulic | Fail-Secure | No power = solenoid valve closes = pressure holds lock |
| Spring-Based | Fail-Safe | Intentionally designed; stored spring energy opens the gate on power loss |
Frequently Asked Questions
Will my gate open during a power outage?
Only if you have a battery backup installed or you use the manual release. Without backup power, most BFT operators default to fail-secure; the gate stays where it is until power returns or you release it manually.
How long does a battery backup last?
It depends on the kit and your gate's duty cycle, but a charged backup system is designed to carry your gate through a typical outage with multiple open/close cycles. The smart charger board keeps the batteries topped up while the power is on, then switches to battery automatically when it's off.
Can I add a backup to an existing BFT opener?
Yes, in most cases. BFT makes backup kits for many of its operator lines, including Phobos, Igea, Kustos, Deimos, Ares, Virgo, Thalia, Thalia P, Zara, and Phebe controllers. Some slide operators, like the Deimos BT, can even have the optional battery backup fitted directly inside the operator casing. Check your model or give us a call to confirm compatibility.
Do maglocks work without power?
No, and that's the point of their design. A magnetic lock requires continuous power to hold, so losing power releases it (fail-safe). If your gate uses a maglock on an exit path, that actually helps with egress compliance, but it also means the gate is unsecured during an outage. A solenoid-driven or mechanical lock, by contrast, stays locked without power (fail-secure).
How do I manually open a gate without power?
Use the manual release. BFT operators ship with a release key that lets you disengage the motor and move the gate by hand. On Deimos BT kits, for example, you locate the emergency manual release knob or keyed release on the operator unit and turn or pull it to disengage the motor. Keep the release key somewhere accessible and make sure family members or staff know where it is.
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