Electric Strikes: How, Where And Why?

As locksmiths, we control access. We install locks to keep people out and key those locks with different levels of security to permit only those authorized to gain entry. We install mechanical or electromechanical locks in order to accommodate the...


Most mortise locks required handed faceplates as the latch is normally not along the centerline. Most handed ROFU electric strikes are equipped with a faceplate that is part of the strike body. The keeper must be positioned to not only accommodate the latch, but also not to interfere with the deadlatch retracting when the door is closed. Some electric strikes, for example the 1440/3440, have the keeper opening starting at the centerline to accommodate a variety of mortise locks.

The fifth and sixth digits of the electric strike part number indicate the strikes’ available voltages. ROFU electric strike solenoids and magnetic coils are available in AC or DC voltages and as intermittent or continuous duty. The fixed voltages are 12, 24 and 48. They are also available as 8-16 volts AC and 3-6 volts DC to accommodate non-standard wiring applications.

The current draw of an electric strike is determined by the solenoid or magnetic coil and its operation. Most ROFU electric strikes draw less than .250Amp. For example, the 18 Series Fail Secure electric strikes in 12 VAC have a current draw of .160Amp. The 24 VDC electric strikes have a current draw of .130Amps. The higher the voltage, the lower the current (Amp) draw.

Remember: An AC electric strike creates an audible buzz when powered. The buzz occurs because the alternating current is a wave pattern. The volume of the buzz varies depending upon the voltage and the solenoid or coil. A DC electric strike does not buzz when powered. A buzzer can be wired in for the purpose of notification.

An intermittent duty solenoid or magnetic coil is designed for momentary on operation only. Normally an intermittent duty magnetic coil or solenoid is used in a Fail Secure electric strike. Power is provided only long enough (usually 10 seconds or less) for a person to open the door. Continuous duty electric strikes are powered all of the time, with power removed only long enough for a person to open the door. Continuous duty electric strikes are always DC.

ROFU electric strikes are available with a radiused face plate for aluminum door jambs that have been radiused. These installations require a special lip bracket that will be supplied automatically when a radiused face plate is ordered. Radiused faceplates are indicated as RAD.

One of the features available with an electric strike is the ability to monitor the opening. Monitoring capabilities available with ROFU electric strikes include the latchbolt. The Latchbolt Monitor Switch notifies when the latchbolt is projected into the electric strike.

For more information, contact ROFU International Corporation, 10029 South Tacoma Way, Suite E-11, Lakewood, WA 98499-5199. Telephone 800-255-ROFU (7638). Web Site: www.rofu.com.

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