DC 12V Fail-Safe Electric Mortise Drop Bolt Lock | Access Control
DC 12V Fail-Safe Electric Mortise Drop Bolt Lock | Access Control
Asia-Teco Electric Mortise Drop Bolt Lock – DC 12V Fail-Safe Access Control
Upgrade your door security with the Asia-Teco B4L-NC Electric Mortise Drop Bolt Lock. Engineered for professional access control installations, this DC 12V fail-safe electronic lock keeps your door secure under power while automatically releasing when power is cut — ideal for emergency-egress compliance and life-safety applications. Whether you're securing an office, server room, residential entry, or commercial facility, this drop bolt lock delivers reliable, low-maintenance performance.
Key Features
- Fail-Safe Operation: Door unlocks automatically when power is removed, ensuring safe egress in emergencies.
- DC 12V Compatibility: Works seamlessly with standard access control power supplies and controllers.
- Mortise / Drop Bolt Design: Concealed bolt retracts smoothly into the door frame for a clean, tamper-resistant installation.
- Built-In Time Delay: Configurable time-delay function gives users a controlled window between access signal and bolt retraction.
- Sturdy Construction: Heavy-duty metal housing withstands repeated daily cycles and resists forced entry attempts.
- Wide Compatibility: Pairs with card readers, keypads, intercoms, and other Wiegand or dry-contact access control systems.
- Easy Wiring: Simple 2-wire connection makes installation straightforward for security professionals and experienced DIYers alike.
Specifications
| Brand | Asia-Teco |
| Model | B4L-NC |
| Operating Voltage | DC 12V |
| Lock Mode | Fail-Safe (Normally Closed) |
| Lock Type | Electric Mortise Drop Bolt |
| Time Delay | Adjustable / Built-In |
| Country of Origin | Made in Mainland China |
What Is a Fail-Safe Lock?
A fail-safe lock is energized to lock and de-energized to unlock. This means that during a power outage or emergency, the door will automatically open, allowing safe exit. This is the preferred configuration for interior doors where free egress is a priority. For more information on door hardware and building safety standards, refer to guidance from the U.S. Consumer Product Safety Commission (CPSC).
Ideal Applications
- Office and corporate access control systems
- Server rooms and data centers
- Residential smart-home door security
- Hotel and hospitality room entry
- Retail stockrooms and restricted areas
- School and institutional security installations
Installation Tips
This lock is designed for mortise installation into standard door frames. Ensure your power supply delivers a stable DC 12V output and that your access controller supports a normally-closed (NC) output trigger. Connect the two lock wires to your controller's lock port — no complex wiring harness required. Always consult a licensed electrician or security professional if you are unsure about your installation.
For workplace safety guidelines related to electrical installations, visit OSHA – Electrical Safety.
Frequently Asked Questions
Q: What is the difference between a fail-safe and fail-secure electric lock?
A: A fail-safe lock (like this B4L-NC model) unlocks when power is removed, making it safe for egress in emergencies. A fail-secure lock remains locked when power is cut, which is better for exterior doors where security must be maintained even during outages. Choose based on your specific door's safety and security requirements.
Q: What access control systems is this electric mortise drop bolt lock compatible with?
A: This DC 12V lock is compatible with virtually any access control system that outputs a standard dry-contact or relay signal, including card readers, PIN keypads, biometric scanners, and intercoms. It works with most major brands of access control panels.
Q: Can I adjust the time delay on this lock?
A: Yes. The built-in time delay feature allows you to set a brief interval between the access signal and the bolt retracting, giving users a controlled and smooth entry experience. Refer to the included documentation for delay adjustment instructions.
Q: What power supply do I need for this lock?
A: You need a regulated DC 12V power supply capable of delivering sufficient current for your lock and access control system. A dedicated access control power supply with battery backup is recommended for professional installations to ensure operation during power interruptions.