Electric Strikes
What Is Electric Strikes
Plain Language Definition
An electric strike is a device mounted in the door frame, typically in the strike plate mortise, that replaces the static metal pocket a door latch or bolt normally seats into. Instead of a fixed opening, the electric strike contains a pivoting or rocking keeper — sometimes called a lip or jaw — that is held in the locked position by a solenoid or motorized mechanism. When an authorized credential is presented to an access control reader (a keypad code, proximity card, key fob, mobile credential, or intercom button), the control panel sends a low-voltage electrical signal to the strike, energizing the solenoid and releasing the keeper so the door can swing open with normal pushing or pulling force. Once the door closes, the keeper resets — either automatically through a spring or through re-energization of the solenoid — and the latch is captured again.
The two dominant operational modes define how electric strikes behave during a power event. A fail-safe electric strike is normally held locked by continuous electrical current; when power is cut — whether intentionally during a fire alarm, accidentally during an outage, or through tampering — the strike releases and the door opens freely. Fail-safe strikes prioritize life safety and are required by code in many egress paths. A fail-secure electric strike (sometimes called fail-locked) operates in the opposite manner: it requires current to unlock, so a power loss leaves the door locked. Fail-secure strikes are common in server rooms, vaults, and interior access points where maintaining a locked state during an outage is the higher priority. Choosing the wrong mode for a given application is one of the most consequential errors in electric strike installation.
Electrically, most electric strikes operate on 12 VDC or 24 VDC, though some legacy devices accept 12 VAC or 24 VAC. The voltage and amperage draw — typically 150 mA to 500 mA — must match the power supply and access control panel specifications precisely. Solenoid strikes use a simple coil-and-plunger design to move the keeper; motorized electric strikes use a small gear motor, which tends to be quieter and produce less heat during sustained energization. Some manufacturers offer dual-voltage models or field-selectable AC/DC switching to simplify integration.
Electromagnetic strikes differ from standard electric strikes in that they use magnetic force rather than a mechanical solenoid to secure the keeper. These are sometimes confused with electromagnetic locks (mag locks), which are entirely different hardware mounted on the face of the door and frame rather than in the strike mortise. True electromagnetic strikes fit into a conventional strike pocket and are interchangeable with solenoid or motorized models in many frame preparations, making them a useful retrofit option.
Where It Is Used
Electric strikes are deployed across a wide range of settings wherever controlled, auditable, or remote access is needed without requiring a person to physically unlock a door.
Commercial and office buildings are the most common environment. Lobby doors, suite entry points, stairwell access doors, and server rooms all regularly use electric strike locks integrated with card readers or keypads. The electric strike allows reception staff or a security desk to buzz in visitors remotely, a capability that would be impossible with a purely mechanical primary entry-door lock.
Multi-unit residential buildings — apartment complexes, condominiums, and assisted living facilities — rely on electric door strikes at main building entrances and sometimes at individual unit doors. Intercom systems that allow residents to speak with visitors and then press a button to release the door almost always use an electric strike as the release mechanism in the frame.
Healthcare facilities use electric strikes extensively for medication rooms, restricted wings, and staff-only corridors. Fail-safe strikes are often mandatory in patient egress paths under fire and life safety codes, while fail-secure strikes protect pharmacy and supply areas.
Educational campuses apply electric strikes at classroom doors, laboratory entries, and administrative offices, frequently integrated with mass notification systems that can lock down or release all doors simultaneously through the access control panel.
Retail and hospitality applications include back-of-house doors, loading docks, and hotel staff areas where keyless entry reduces the operational burden of managing physical keys across high-turnover workforces.
Industrial and manufacturing facilities use electric strikes on hazardous area enclosures, equipment rooms, and perimeter gates, sometimes in environments requiring strikes rated for wide-gap frames, high-cycle duty, or exposure to temperature extremes and moisture.
In residential settings, electric strike installation is increasingly common in custom smart-home builds and retrofits, where homeowners want remote entry capability for family members, service providers, or guests without issuing physical keys. A standard residential electric strike paired with a video doorbell and a smartphone app creates a functional remote-access system at a fraction of the cost of a full commercial deployment.
Security and Service Considerations
Common Problems
Electric strikes are mechanical and electrical devices exposed to daily cycling, environmental stress, and the inevitable imprecision of door alignment over time. Several categories of failure occur with enough regularity that any technician performing electric strike installation or maintenance should be prepared to address them.
Misalignment and binding. A door that has settled, warped, or had its hinges shift over time may present the latch bolt at a height or horizontal position that doesn’t match the electric strike keeper. When the latch drags against the edge of the keeper instead of seating cleanly, the keeper can bind, refuse to reset, or place lateral stress on the solenoid plunger. This is one of the most common field complaints with electric strikes and is often misdiagnosed as an electrical fault. Correct diagnosis requires checking latch-to-strike alignment with the door open and measuring the latch height against the strike pocket centerline.
Voltage and polarity errors. Supplying 24 VDC to a strike rated for 12 VDC will typically burn out the solenoid coil within hours or days. Reversing polarity on a DC strike that relies on polarity for fail-safe versus fail-secure behavior can cause the device to operate in the wrong mode — a serious security risk. Technicians performing electric strike installation must verify voltage, current draw, and polarity at the strike terminals before energizing, not after.
Solenoid overheating. Many electric strikes are not rated for continuous energization; they are designed for momentary or intermittent duty cycles. A fail-safe strike that is energized continuously to remain locked will overheat the solenoid, degrade the coil insulation, and eventually fail open — the worst-case outcome for a secure area. Installations requiring continuous energization should use strikes specifically rated for that duty cycle or incorporate timing circuitry to minimize heat buildup.
Strike chatter and noise. An electric strike that buzzes, chatters, or clicks audibly when energized is usually receiving AC power (which reverses polarity 60 times per second, causing the solenoid plunger to vibrate) when it should receive DC, or it is receiving insufficient current to fully seat the keeper. This is particularly common when electric door strikes are powered by an access control panel with an undersized or aging power supply. Measuring actual voltage at the strike terminals under load — not just at the panel output — frequently reveals a significant voltage drop across long wire runs, especially when small-gauge wire was used during installation.
Keeper wear and fatigue. High-traffic doors may cycle an electric strike hundreds of times per day. Over months and years, the pivoting keeper and its spring or return mechanism wear. A worn keeper may not fully return to the locked position after release, leaving the door unsecured without any indication on the access control panel. Periodic physical inspection of the keeper’s spring tension and locking engagement is an important maintenance step that electronic monitoring alone cannot replace.
Corrosion and environmental ingress. Exterior doors and doors in humid or industrial environments expose electric strikes to moisture, salt air, and contaminants. Corrosion on the solenoid plunger or keeper pivot can cause intermittent failures that are difficult to reproduce in controlled testing. Strikes installed in these environments should carry an appropriate IP (Ingress Protection) rating, and the wiring connections to the strike should be sealed against moisture wicking along the wire run.
Incorrect fail-safe or fail-secure selection. This deserves re-emphasis because its consequences are severe. A fail-secure electric strike on a fire-rated egress door is a life-safety violation in most jurisdictions and will fail a fire marshal inspection. A fail-safe strike on a pharmacy door or server room means anyone can gain entry during a power outage. These decisions must be made during design, verified during electric strike installation, and documented for the life of the building.
Integration failures with access control systems. Electric strikes are only as reliable as the access control panel, wiring, and credential readers connected to them. A strike that tests correctly in isolation but fails to release on valid credentials is usually tracing back to a panel relay, a wiring fault, or a credential reader that is not sending the correct output signal. Systematic troubleshooting — starting at the strike and working back to the panel — is more efficient than replacing hardware speculatively.
Related Locksmith Work
Electric strikes rarely exist in isolation. Competent locksmith work in this domain encompasses a cluster of related hardware and systems that must function together correctly.
Access control panel programming and wiring. The access control panel governs which credentials release which electric strikes, at what times, and with what audit trail. A locksmith performing electric strike installation typically also runs and terminates low-voltage wiring between the panel and the strike, verifies the relay output voltage and current capacity, and may program basic access schedules and credential enrollment depending on the system.
Door closers and frame preparation. Electric strikes depend on the door returning to a fully closed, latched position to reset. A worn or improperly adjusted door closer that allows the door to coast to a stop before fully latching leaves the electric strike keeper unseated. Adjusting or replacing door closers is often part of the same service call as electric strike installation or repair.
Request-to-exit (REX) devices. Most access control systems include a motion sensor or push-button REX device on the secure side of the door that signals the panel to shunt the door contact alarm when the door opens from inside without a credential. REX devices and their wiring are installed and tested as part of the same scope as the electric strike itself.
Door contacts and monitoring. A magnetic door contact tells the access control panel whether the door is open or closed. When an electric strike releases but the door contact shows the door never opened, or when the contact shows the door is closed but the latch is not engaged, the monitoring loop reveals a hardware problem. Installing and calibrating door contacts is standard work in any electric strike deployment.
Primary entry-door lock hardware coordination. Electric strikes work in conjunction with the door’s mechanical latch or deadlatch. The strike must be selected and adjusted to accept the specific latch bolt profile — cylindrical, mortise, or rim — and the latch must be spring-loaded adequately to retract smoothly when the keeper releases. Mechanical lock hardware assessment is a prerequisite for correct electric strike specification.
Electrified locksets and panic hardware. Some installations combine electric strikes with electrified cylindrical or mortise locksets, or with electrified panic exit devices (crash bars). These combinations are common in high-security or high-occupancy environments and require coordinated wiring, power supply sizing, and code compliance review that a knowledgeable locksmith technician can provide.
Intercom and video system integration. In residential and light commercial settings, electric door strikes are often the release mechanism for audio/video intercom systems. Ensuring the intercom’s relay output is compatible with the strike’s voltage and current requirements — and that the release timing is appropriate — is part of a complete installation.
When to Call a Locksmith
Call a licensed locksmith technician for electric strikes any time you are installing a new system, replacing an existing strike that has failed, troubleshooting a strike that will not release or will not lock, or auditing an existing installation for code compliance and correct fail-safe or fail-secure mode. Electric strike installation involves low-voltage wiring, precise mechanical alignment, access control panel integration, and knowledge of applicable fire and life safety codes — all areas where an untrained attempt can create security vulnerabilities or code violations that are costly to correct after the fact. Low Rate Locksmith dispatches mobile technicians 24 hours a day, seven days a week, for electric strike work across the United States and Canada. Call (833) 439-8636 to speak with a technician or schedule service.
You may also find useful: Electric Strike Installation, Electric Strike Service, Fail Safe vs Fail Secure, Healthcare Facility Access Rules, Residential Electric Strikes, Solenoid Lock.