CQR Deedlock Standard Magnetic Lock, Single Door, Monitored, 545kgf AEM20020

What this magnetic lock is for

A magnetic lock, or maglock, holds a door shut with an electromagnet on the frame and a steel plate on the door. There is no latch to wear or jam.

This full-size CQR lock suits doors on an access control system where the force of the door or the traffic calls for more than a slimline body. The monitored version also lets the system know the door state.

How does a monitored maglock work?

• Magnet: When powered, a coil in the lock body pulls the armature plate firmly against it. Cut the power and the door is free.
• Monitoring: A monitored lock usually has a contact that changes state when the door is held, which goes back to a controller input. Check your unit's wiring instructions for the details.
• Indicator: the L shape light shows door status across 180°, which helps in a busy corridor or a hospital.

Where to use it

CQR designs it for medium to high traffic areas and for entry and exit door installs, which covers main entrances and busy internal routes.

On an escape route, settle how the lock will release before fitting it. That can change the wiring and the parts you need.

What the figures mean in practice

• 1200 lbf (545kgf) nominal: this is a nominal figure for the magnet. A bracket will typically reduce the holding force on the door by up to 70%, because a bracket can flex.
• 500mA at 12v, 250mA at 24v: a magnetic lock draws current all the time it is locked, so add this to your supply load. Running at 24V halves the current.
• 4.4KG: check the frame head can carry the lock and its fixings.

Installing it

• Choosing a bracket: the STD/L is the L bracket, the STD/ZL is the Z&L bracket and the STD/AH is the armature housing.
• Safety straps: the AEM/STRAPS are made to stop the magnet falling if it ever comes away from its mounting. That is worth considering over a busy doorway.
• Alignment: The plate must meet the magnet flat and square, because poor contact reduces holding force.
• Protect the controller: A magnet coil can give a voltage spike when it switches off. Fit any suppression your controller's instructions call for.

Planning your system

A complete door needs a keypad or reader, a controller, an exit button and a 12/24V DC power supply sized for the lock's constant draw.

On an escape route, a magnetic lock usually also needs a fire alarm link and an emergency door release, and any battery back-up should be sized with that in mind. Agree the design with whoever holds the fire strategy.

Standards and ratings explained

• TS010: this is the Doors and Hardware Federations technical standard for electro-magnets, in its 2019 edition. This lock is Grade 3.
• IP rating: check the rating with CQR, and treat outside or wet positions as unproven until you have.