This is how magnetic locks work

The design of magnetic lock is the same as that of magnetic iron. It uses the principle of electromagnetism. When the current passes through the silicon steel sheet, the magnetic lock will generate a strong suction force to tightly absorb the adsorption iron plate to achieve the effect of locking the door. Only a small current is needed for the magnetic lock to generate a huge magnetic force. The access control system that controls the power supply of the magnetic lock will cut off the power after accurately identifying the person, and the magnetic lock will lose the suction force and open the door. Because the magnetic lock does not have a complicated mechanical structure and the structure of the lock tongue, it is suitable for the passage control of escape doors or fire doors. The lock body is protected by the injection of epoxy resin (epoxy) inside.

The suction strength of the magnetic lock is now indicated in LB (pounds), and the inspection method is static pressurization. The so-called static pressurization is that the magnetic lock gradually increases the pulling force on the adsorption iron plate after the power is turned on. When it exceeds the suction force of the magnetic lock, the adsorption iron plate is instantly opened. The data of this pulling force is the pulling force value of the magnetic lock. Moreover, the magnetic lock and the adsorption iron plate must be face to face and linearly pressurized (collinear load test), so that the magnetic lock's suction (Holding Force) is the largest. The adsorption iron plate may be magnetized in a short time due to the long-term magnetic induction of the magnetic iron.