Electric Strikes: Everything You Should Know

Unlock doors with remote electrical control.

The Adams Rite electric strikes have two adhesive labels attached to each electric strike. The larger label indicates the model, voltage, amperage, date of manufacture, the duty rating, and UL listing (if applicable). The smaller label indicates the model of the electric strike, the static strength, the dynamic strength, and the endurance. For this 7100-510 electric strike, the static strength is 1,500 lbs.; the dynamic strength is 70 ft-lbs, and the endurance is 500,000 cycles.

An AC-rated electric strike's solenoid will buzz when power is applied. Alternating Current, which regularly reverses direction, causes the buzzing noise. DC power does not buzz as Direct Current flows only in one direction. To eliminate the AC buzz, install a rectifier anywhere between the transformer/power supply and the electric strike.

A continuous duty electric strike can be operated as either fail-secure or fail-safe. A fail-secure electric strike unlocks when powered. If power should fail, the electric strike remains in the locked condition. A fail-safe electric strike locks when powered. If power should fail, the electric strike unlocks and remains in the unlocked condition. For this reason, if a fail-safe electric strike is used for the locking mechanism in a building, there must be a back-up battery system installed in case of power failure. Note: Before installing an electric strike contact the local authority having jurisdiction.

The Adams Rite 7100 Series electric strike operates using the solenoid located on a shuttle that slides to either lock or unlock the jaw when power is applied. For a fail-secure electric strike, when no power is applied, the shuttle keeps the latch arm in the unlocked position. In this position, the blocking arm is free to move, allowing the jaw to tilt out of the way when the door is swung open. When power is applied, the latch arm moves against the blocking arm, locking it in place. In this position, the blocking arm keeps the jaw from tilting, not allowing the latch to exit the electric strike or the door to open without first retracting the latch.

The AR 7100 Series electric strikes have field reversible operation. A fail-safe electric strike can be converted to a fail-secure electric strike without any additional components or specialized tools or operations or vice versa.

To convert a fail-safe electric strike to fail-secure:

Step 1. Remove the faceplate and strike lip.

Step 2. Remove the screws securing the cover onto the case. Lift off the cover.

Step 3. Carefully remove the blocking arm return spring.

Step 4. Lift off the blocking arm.

Step 5. Lift off the latch arm.

Step 6. Lift off the separation plate.

Step 7. Carefully remove the solenoid from the case.

Step 8. Carefully lift out the shuttle and the shuttle spring.

Step 9. Place the shuttle spring into the opposite end of the shuttle.

Step 10. Install the shuttle into case, spring end first. Make sure the spring compress properly.

Step 11. When the shuttle is seated, install the solenoid in the reverse direction. There is an opening for the wiring on each end of the case.

By changing the position of the shuttle spring and the direction of the solenoid, the electric strike operation is reversed.

Step 12. Install the separation plate, latch arm, blocking arm, spring, case cover, strike lip and faceplate. Test the operation of the electric strike.

With the case cover removed, a fail-safe configured AR 7100 Series electric strike can be identified by the position of the blocking arm tip that must be with the latch arm notch. This way when power fails, the jaw cannot push be pushed open because the blocking arm is locked in place within the latch arm notch.

With the case cover removed, a fail-secure configured AR 7100 Series electric strike can be identified by the tip of the blocking arm just out of the latch arm notch when power fails. In this configuration, the when pressure is exerted against the jaw, the blocking arm will tilt out of place, and the latch can be moved out of the electric strike.

To convert back to a fail-safe operation, repeat the above steps. Be careful not to loose the springs. They are available separately.

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