Electromagnetic lock

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  • Q: 1)How Magnetic Locks Work?

  • A:



    A magnetic lock, often referred to as a mag lock, consists of an electromagnet and an armature plate. 

    The magnet is mounted inside of the door opening, which prevents tampering, while the plate is installed on the face of the door. 

    When the magnet is connected to an electrical source, it produces a strong magnetic attraction that holds the magnet tight to the plate, 

    effectively locking the door. The lock is typically powered using either the building's electrical system or a separate battery pack. 

    Because a mag lock can only be used with DC12V or DC24V power, a converter unit must be added when relying on building power. 

    These locks are said to be 'fail-safe,' meaning that once the power off, the door will remain unlocked, allowing occupants to exit safely.


    Electromagnetic Theory


    Maglocks are based on the science of electromagnetism. Based on the principles of electromagnetism, 

    when a current is run through a loop of wire, or solenoid, a magnetic force will be produced. This magnetic force is of sufficient strength to prevent the door from opening under a specified amount of pressure. To increase the strength of the magnetic force, 

    multiple solenoids may be used, or they may be placed around a core made of iron. 

    The magnetic effect of the solenoids not only produces its only force but also amplifies the natural magnetism of the iron. 

    Maglocks are rated based on the amount of force they are able to withstand without failing. For example, 

    a 1,200 pound Mag Lock can withstand 1,200 pounds of force while still keeping the building secure.




    One of the biggest advantages of using a mag lock is that it can't be picked or tampered with like a traditional lock cylinder. 

    No keys are used, as the lock is generally tied into an electrical security system. These systems rely on one of four basic methods to operate the lock. 

    They are often connected to a buzzer, which must be manually released by someone inside the building before the door will open. 

    A mag lock may also be used with a keypad system, where occupants enter a numerical code to activate the lock and open the door. 

    In many commercial settings, card readers are used with these locks, making it easy to deactivate a card in the event an employee is

    terminated or loses his/her key card. Finally, in high-security situations, the maglock may be activated by scanners that read fingerprints, 

    retinas, or facial features of an occupant before they are permitted to enter.

  • Q: 2)Magnetic Lock Vs. Electronic Strike

  • A:

    Magnetic locks and electric strikes are electrical hardware devices used to maintain the security of a door opening. 

    Both of these devices can be activated by a range of tools, including passcodes, biometric readers, keycards or buzzers. 

    When comparing magnetic locks to electric strikes, consider factors such as intended function, security needs, 

    safety egress and cost to help you choose between the two.




    A magnetic lock, or mag lock, consists of a large magnet that is installed along the top of a door frame. A metal plate, 

    or armature plate, is fastened to the door so it lines up with the magnet. When electrical power is supplied to the magnet,

    it creates a magnetic charge that keeps the magnet tightly pressed to the metal plate. This keeps the door securely locked until power is removed or interrupted.


    An electric strike must be used along with some other form of locking device, such as a lockset or exit device (panic bar). 

    Electrical power is supplied to the strike, which holds the lock bolt in place, keeping the door locked until the strike is activated by a buzzer, keycard or other device.




    With a magnetic lock, the door is always locked from both sides of the opening. This makes mag locks a very secure option for 

    areas that require high levels of security. Users must activate the lock with a keycard or other device when leaving and when entering. 

    A handle or latchset is used to operate the door, but typically has no locking function.


    Electric strikes provide security only for the exterior side of the door. Occupants can freely exit at anytime from inside the building 

    simply by turning the knob or handle, or by depressing the pad on the exit device. From the outside, the door can only be 

    unlocked with a keycard or other activating device, which signals the strike to release the lock bolt.




    All electrical hardware can be described as either 'fail-safe' or 'fail-secure.' Fail-safe hardware stays locked when 

    power to the hardware is cut, keeping the building secure. Fail-secure hardware unlocks once power is cut, 

    allowing for safe egress of occupants. A magnetic lock is always fail-safe, and unlocks automatically if power is cut.

    Electric strikes can typically be set to either of these two options using an integral switch. All fire-rated doors must be equipped 

    with fail-safe hardware for safe egress at all times.




    Because a magnetic lock is installed on the face of the door and frame, it can be installed relatively easily by most contractors. 

    It is one of the most effective types of hardware for securing both sides of a door, and provides a great door of force to keep the door secure.


    Electric strikes are usually more affordable than magnetic locks, making them a good choice for building managers on a budget. 

    It is also easier in general to meet fire and life safety codes with an electric strike than with a mag lock. 

    An electric strike is much less likely to delay egress because it can be easily operated from the inside of the building.




    Magnetic locks are among the more expensive types of door hardware. They are also fairly easy for burglars to beat, 

    because they will no longer keep the door locked if the power is cut. Finally, these locks pose a potential safety hazard in terms of slowing egress during an emergency.


    Because of the complexity of powering and installing electric strikes, they typically require skilled installers. These strikes must be chosen carefully based on the type of lock they will be used with. If the wrong strike is chosen, the lock bolt won't fit securely inside.

  • Q: 3)Electromagnetic locks Advantages and Disadvantages

  • A:

    Magnetic locks possess a number of advantages over conventional locks and electric strikes. For example, 

    their durability and quick operation can make them valuable in a high-traffic office environment where electronic authentication is necessary.




    1-1:Remote operation: Magnetic locks can be turned on and off remotely by adjusting the power source.

    1-2:Easy to install: Magnetic locks are generally easier to install than other locks since there are no interconnecting parts.

    1-3: Quick to operate: Magnetic locks unlock instantly when the power is cut, allowing for quick release in comparison to other locks.

    1-4: Sturdy: Magnetic locks may also suffer less damage from multiple blows than do conventional locks. 

           If a magnetic lock is forced open with a crowbar, it will often do little or no damage to the door or lock. There are no moving parts in an electromagnetic lock to break.




    1-1: Requires a constant power source in order to be secure.

    1-2: Can de-energize in the event of a power outage, disabling security.

    1-3: Expensive in comparison to mechanical locks.

    1-4: Requires additional hardware for safe operation.

  • Q: 4) Installation for Electromagnetic lock

  • A:

    The magnetic lock is suitable for both in-swinging and out-swinging doors. Brackets (L bracket, LZ bracket, U bracket) are 

    used to orient the armature for use with both applications. Filler plates are also used to provide a large, flat mounting area 

    on the door frame when the electromagnet is larger than the available mounting space on the door frame due to the frame's geometry.


    The magnetic lock should always be installed on the secure side of the door. Most installations are surface mounted. 

    For safety, magnetic lock, cables, and wires should be routed through the door frame or flush mount with wire moulding.


    Installation is straightforward. With in-swinging applications, the electromagnet is typically installed in the opening corner of the 

    door at the door's header. Maglocks can also be installed vertically in the door opening when they are furnished with a full length housing. 

    With this configuration the armature is through-bolted through the door and oriented to mate with the face of the electromagnet. 

    The armature plate and electromagnet must touch in order to provide locking holding force.


    With out-swinging applications, the electromagnet is typically installed on the side of the door header. In this configuration, 

    the armature is mounted on a Z shaped bracket that orients the armature to mate with the electromagnet.


    Magnetic locks are almost always part of a complete electronic security system. Such a system may simply consist of an attached 

    keycard reader or may be more complex, involving connection to a central computer that monitors the building's security. 

    Whatever the choice of locking system, fire safety is an important consideration.


    Other variations and improvements on the electromagnetic locks have been developed. The most remarkable is the shear lock, 

    where the armature does not directly pull off the face, but the load is instead in shear, like a mechanical stop. The shear magnetic lock 

    allows a door to swing in both directions, as opposed to the original (and now ubiquitous) direct pull type, which normally works 

    either in an in-swing or out-swing configuration. In order to provide the shear magnetic lock with the appropriate holding force, 

    then two pins lock the armature onto the magnet itself, and ensure that the magnet locks into place.


    If you have any inquiries for installation, pls kindly contact us, sales@s4a-access.com we have our own manufacture and 

    within 12years production experience for magnetic lock,All locks, we provide OEM and ODM service and 1 year quality guarantee.

  • Q: 5) Application modes-Magnetic lock is Fail-safe or Fail-Secure?

  • A:

    For safety purposes, electric locks and electric strikes can be designed to operate in one of two modes:


    Fail-safe –to protect people: The lock is released if power cuts off.


    Fail-secure (also known as non fail safe) – to protect property: The lock remains closed if power cuts off.

    This type of lock has a cylinder, similar to those found in conventional locks. The cylinder makes it possible for the lock to remain secure,

    even if the power supply is cut off.


    An electromagnet lock is ONLY Fail-Safe, so it must satisfy applicable fire regulations so as to be safe in emergency situations.

  • Q: 6) What parts do I need to order?

  • A:

    The minimum you need is the lock, power supply and a request-to-exit button. The request-to-exit button unlocks the door for exit, 

    but most local fire codes require at least 2 methods to unlock the door.


    There are a few components that are required for a magnetic lock installation:


    1-1: Select a Magnetic Lock. You should choose a lock strength (EL-600 to EL-1200 ) =600-1200lbs appropriate for your door.

    1-2: Add a Power Supply with Battery Backup. Model is: PS-300B is a good choice.

    The battery backup is critical to ensure that your door stays locked if the power goes out.


    1-3: dd a Request-to-Exit Button, which will unlock the door when pushed.EB series or non-touch version. EB-16 or EB-17


    1-4: Add an optional Motion Sensor, which will unlock the door automatically when someone approaches the door from inside.

    Model is M-204


    Also, you could choose a Relay Timer to keep the door unlocked for a specific time period, to allow for the delay 

    between when a person presses the Request-to-Exit button and when they push open the door.


    Check out s4a-access.com for a complete Maglock package configured specifically to work with your systems.

  • Q: 7)What if I have questions?

  • A:

    If you have any questions about what maglock hardware would be most appropriate for your facility please contact +86 755 29450011 or email to: sales@s4a-access.com

  • Q: 8)Are magnetic door locks secure?

  • A:

    An electromagnetic lock, magnetic lock, or maglock is a locking device that consists of an electromagnet and an armature plate. There are two main types of electric locking devices. Locking devices can be either "fail-safe" or "fail secure". ... Direct pull electromagnetic locks are inherently fail-safe. 280KG/600lbs is the most popular holding force to be selected.

  • Q: 9) The Lock doesn't function after power on

  • A:

    1: Check the input of the power supply, whether it follows the demand(12V,1A or above)

    2: Check the connecter and the magnet whether it's in a proper/secure position.

    If yes, Change the power/voltage for special use or Change the high-quality wire

    and make sure length is 10m.

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  S4A-Security For All.  S4A Industrial Co., Limited, Founded in 2010, We have been dedicating in access control production R&D and sales for 10year till now. With the belief that we do one thing well in a lifetime, our CEO has been in this industry for 15 years. During the past 10 years, our products have been exported to various countries and regions. And 90% of customers come from the recommendations of cooperative customers, and 80% of the turnover comes from cooperative customers in the past 10years.Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. We attach great importance to the partner's appeal, customer's suggestions, and feedbacks. To strengthen Product quality awareness, client's service awareness. Our clients and S4A are on the same path walking for many years.       S4A's future would be even more brilliant, this is related to all of our staff's working sweat. When you join this team, you will feel an invisible power to drive walk forward. S4A mainly produces a series of security Door Access Control such as:Network Access Controller, Locker board, Electromagnetic lock, Standalone door Controller, Automatic door opener, etcOur team can manufacture products, sell products, and do after-sales.We can create value for you! 1-We put quality and price in top priorityQuality takes great importance for a company's credibility, and buyer's every penny spend must worth it. That is our most basic principle. Our business mainly for wholesale, so we could offer large quantities at competitive prices. During the past 10 years, We work hard to create value for our customers, and with our help, customers have an increasing market share. 99% of the customers who have cooperated with S4A will choose 2nd,3rd, and endless purchasing. because S4A not only controls the product quality very well, but the price is also very reasonable. As you can see, we have hundreds of products, but We do not produce all products. We adopt a portfolio strategy and invest in each factory. Because of the large export volume and the stable cooperation relationship with the factory, we can better control the quality and price of the products. Cooperate with us, you have no worries. In the past 10 years, more than 80% of our customers' sales have increased turnover by 15-20% every year. 2 -We have experienced and professional sales Our sales are not just sold products, we also help you choose products, do market research. Our company's top sales team all have more than 8 years of experience in the access control market, our team loves learning, loves sharing, good at summarizing, and dare to undertake responsibility. Because all of us regard the access control field as a career we love throughout our lives. At S4A, you can get a quick response and flexible support, and you can see our ability to solve problems. get professional guidance and recommendations, you don't have to worry about after-sales at all. Our task is: All emails must be replied within 2 hours at a working time!3-We have experienced and professional engineer S4A is equipped with 6 technical engineers for after-sales. and every year, We take out 20% of the net profit as research and development for new products, We all know Access control system is a kind of product with technical knowledge. When you have headaches such as unable to connect wires, Software compatibility issues or programming device, please remember S4A's after-sales support at any time. Our task is: All technical issues must be solved within 4 hours at a working time!4-Support OEM & ODM  All of our products accept OEM and ODM orders at a reasonable quantity. we help customers to promote their brand. We all know Access control is an increasingly popular industry. Based on past experience, we have found that customers who have just started to become distributors do not have a large number, but want to promote their own brands. For this kind of customer, we will also have a special application to do OEM for him. Because Support is mutual.5. S4A Vision Our Vision is to let all people in the whole world free their hands for keys, whether it is in poor areas or developed cities able to use access control.<
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