Electromagnetic lock, surface, single. With a simple design and modern manufacturing technology, is a reliable device to lock doors and gates. Force an entry closed by lock requires the use of force of > 500 kg. It operates reversibly - it is open when power is off. The lock is composed of two elements: electromagnet (usually mounted in the frame) and lock plate (usually mounted in the door). Error free operation of the lock is a result of lack the mechanical elements, which after some time become damaged.