Automatic linear sliding doors are the most widely used access system in commercial, industrial, and access control environments. Their electromagnetic locking mechanism directly determines the security, energy consumption, and reliability of the entire system. Choosing the right type of solenoid depends on three parameters: behavior in the event of a power failure, expected duty cycles, and integration requirements with the control system.
Types of solenoids for linear sliding doors
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VM/ND Series — holding force with neodymium magnets
The magnetic holding devices of the VM/ND Series incorporate permanent neodymium magnets. They provide high holding force with minimal power consumption, as the magnet keeps the door closed without continuous power and only requires a current pulse to release it. They are the preferred option for installations with infrequent opening cycles or where brief power outages must not result in accidental opening.
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VEM Series — fail-safe solution for emergency exits
The electromagnetic holding magnets of the VEM Series operate while energized: they keep the door locked when power is supplied and release it immediately when power is cut. A fail-safe configuration by design. They are the standard solution for emergency exits, evacuation routes, and any access point where regulations require automatic opening in the event of a power failure.
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CU20/CP — fail-secure solution for controlled access
The CU20/CP linear solenoid maintains locking even without electrical power. Its reinforced shaft guide ensures reliable operation under radial loads, which are common in high-traffic sliding doors. A fail-secure configuration: suitable for restricted-access areas where the door must remain locked during a power outage.
Custom solenoid manufacturing
When standard models do not meet the project requirements—whether in terms of holding force, operating voltage, dimensions, or IP protection rating—NAFSA develops custom solutions for manufacturers and system integrators. The process includes technical analysis, prototyping, and functional validation.
At NAFSA, we design and manufacture solenoids for automatic door locking systems used in a wide range of industrial applications.