Electric Strike vs Magnetic Lock

The Fundamental Logic: Fail-Safe vs. Fail-Secure

Every electronic access control specification starts with one question: what must happen when the building loses power? This single engineering choice dictates everything else—from wire gauge to emergency responder access protocols.

Why Electric Strikes Default to Fail-Secure

An electric strike keeps the latchbolt captive inside the strike pocket until the access control system sends a momentary signal. When power drops, the strike reverts to a standard mechanical keeper. The door remains locked from the exterior, but occupants can still exit freely using the inside lever, panic bar, or push pad. This makes fail-secure the preferred mode for perimeter doors where facility security must survive a power interruption.

The mechanical override is inherent: facility managers retain key access regardless of access control system status. For buildings with existing panic hardware, the electric door strike integrates without altering egress functionality—an underappreciated compliance advantage.

Why Magnetic Locks Default to Fail-Safe

A magnetic lock generates electromagnetic force only while energized. Cut the power, and the magnetic field collapses instantly—releasing the door unconditionally. This fail-safe behavior serves a critical purpose: in a fire or emergency, building occupants must never be trapped behind a locked door that requires electrical power to open.

Maglocks have no latch, no bolt, and no mechanical wear point. The armature plate mounts on the door leaf while the electromagnet mounts on the header. When powered, the two surfaces bond with a holding force typically ranging from 600 to 1,200 lbs. The absence of moving parts means far fewer maintenance cycles, but the total reliance on continuous power introduces a different risk profile entirely.

Technical Specifications and Performance Data

Procurement teams need hard specifications. The table below compares key technical parameters that directly affect power supply sizing, wire runs, and frame preparation scope. Actual performance varies by manufacturer and model—verify the cut sheet before specifying.

Power Supply Implications and Continuous Duty Design

Electric strikes draw current only during the brief moment of release—typically 300 to 500 mA for a fraction of a second. Magnetic locks draw the same current continuously, 24 hours a day, for every lock in the facility. For a building running 80 maglocks, the aggregate power consumption and heat dissipation become meaningful design considerations. Confirm that your 12/24V DC power supply is rated for continuous duty with adequate headroom.

When specifying power supplies, pay attention to inrush current at startup and voltage drop over long wire runs. A maglock’s holding force drops significantly if the voltage at the magnet is below manufacturer tolerances. Use dedicated power supplies with battery backup for maglocks, and size wire gauges to maintain consistent voltage at the farthest door.

Application Matrix: Which Lock for Which Door?

Application suitability is where theory meets the building plan. The following matrix maps door types to recommended locking hardware based on structural constraints, fire rating requirements, and daily usage patterns.

When Frame Preparation Becomes the Deciding Factor

One recurring mistake in commercial access control specifications is applying maglocks to every door in a facility for visual consistency. The correct approach is door-by-door: evaluate frame construction, fire rating, egress path, and acceptable peripheral hardware cost before locking in the selection.

For existing door frames that cannot be cut (historic millwork, thin aluminum channels), a maglock’s header-mounted design avoids irreversible structural changes. Conversely, when the budget cannot accommodate maglock peripherals on every door, electric strikes keep the total installed cost within constraints. Frame prep feasibility often pushes the decision one way long before holding force or aesthetics are even considered.

Compliance and Life Safety: The “Hidden” Costs of Maglocks

The most significant cost difference between these two technologies does not appear on the lock supplier’s invoice. It surfaces during the compliance review, when the fire marshal or AHJ requires specific peripheral hardware for every maglocked door on an egress path.

Egress Requirements (NFPA 101 / IBC)

NFPA 101 Life Safety Code and the International Building Code (IBC) require that occupants can exit any door in the egress path with a single motion and without prior knowledge of any special device. A maglock, by itself, violates this requirement. To comply, maglock installations must include at least two independent means of release. The following list outlines the key provisions:

• One movement egress: the door must release with a single obvious action; no twisting, turning, or prior training allowed.
• Sensor-initiated release: a PIR motion sensor must detect an approaching person and release the lock before they reach the door.
• Redundant manual release: a plainly labeled emergency release button, often pneumatic, must be present at the door to break lock power.
• Fire alarm integration: the maglock must release immediately upon fire alarm activation via a hardwired relay from the access control panel to the fire alarm control unit.
• No special knowledge: exit devices cannot rely on keys, codes, or electronic signals that an occupant must learn or locate.

Required Peripherals for Maglock Installations

• PIR motion sensor (REX): Detects a person approaching the door from the inside and signals the maglock to release immediately. Must be positioned to prevent tailgating false triggers. Typical cost: $80–$200 per door plus wiring.
• Emergency release button (pneumatic or push-to-exit): Provides a redundant mechanical or electrical break of lock power at the door. Required even if a motion sensor is present. Must be clearly labeled and timed to prevent immediate re-lock.
• Fire alarm relay integration: A dedicated relay must interrupt maglock power when the fire alarm activates. This requires coordination between the access control installer and the fire alarm contractor. Testing and documentation add to commissioning time.
• Backup power supply / battery: Because maglocks unlock when power fails, facilities that need security during outages must add a battery-backed power supply. This changes the cost equation significantly versus a fail-secure electric strike.

The Total Cost of Compliance

In contrast, an electric strike on a door equipped with panic hardware or a standard lever requires none of these peripherals for code compliance—the mechanical egress path already satisfies NFPA 101. This is why the total installed cost for a code-compliant maglock often runs two to three times the hardware-only cost. When calculating budgets, apply the following rule of thumb:

• Electric strike installed cost: hardware + frame prep labor (often no additional peripherals).
• Maglock installed cost: hardware + PIR sensor + REX button + fire alarm relay + backup power + wiring labor for all components.
• For a single door, the hardware-only price differential may be modest, but the cumulative peripheral and labor cost can add $500–$1,000 per opening over a strike.
• Over a 20-door project, choosing maglocks where strikes would suffice can inflate the capital budget by $10,000–$20,000 without any functional security benefit.

Installation Complexity and Maintenance Lifecycle

Total cost of ownership includes labor, downtime during retrofit, and long-term maintenance. The two technologies diverge sharply on all three metrics.

Retrofitting Electric Strikes into Existing Frames

Installing an electric strike requires cutting a mortise pocket into the door frame jamb to recess the strike body. On hollow metal frames, this demands a template, a cutout tool, and careful alignment—the door strike plate position must match the latchbolt exactly. Expect 1.5 to 3 hours of skilled labor per door on existing frames. For aluminum storefront frames, the process is more forgiving but still requires precision work.

If the existing frame is damaged, rusted, or non-standard, retrofit costs can escalate quickly. For new construction, the frame can be factory-prepped for the strike, eliminating field labor. When bidding retrofit projects, factor frame condition surveys into the scope.

Maintenance Requirements for High-Traffic Cycles

Electric strikes contain moving parts—a solenoid, a pivot, and a keeper. In high-cycle environments such as hospital corridors or university buildings, these components wear over time. A strike rated for 250,000 cycles may last three to five years in a lobby that cycles 200 times daily. Maintenance typically involves cleaning the keeper pocket, lubricating the pivot, and eventually replacing the strike body.

Magnetic locks have no mechanical wear mechanism. The magnet and armature plate simply make surface contact. The primary maintenance tasks are periodic cleaning of the contact surfaces (to remove dust and oxidation that reduce holding force) and verifying that the power supply voltage remains within specification. For continuous duty applications, this translates to materially lower maintenance costs across a 10-year lifecycle—often the deciding factor for high-traffic institutional projects.

Strategic Decision Checklist: Final Selection Criteria

Before finalizing your specification, verify each point against the facility door schedule. A single overlooked fire-rated door or code requirement can trigger a costly change order.

• Is the door fire-rated? If yes and it is on an egress path, confirm that an electric strike preserves the fire label. For maglocks, verify AHJ acceptance and that fire alarm release integration is fully specified.
• Is manual key override required? Electric strikes provide this inherently. Maglocks require a separate key switch or a remote release—budget for the extra hardware and wiring.
• Does the door have a frameless glass design? This is the strongest case for a maglock. Confirm that the glass door bracket and armature plate are rated for the door thickness and weight.
• What happens during a power outage? If security requires the door to stay locked without power, a fail-secure electric strike is the default choice. If emergency egress must override security, a fail-safe maglock (or a fail-safe strike variant) is appropriate.
• Does the budget account for maglock peripherals? PIR sensors, REX buttons, fire alarm relays, and backup power are not optional for code-compliant maglock installations. Add 200–400% of the magnet hardware cost for total installed budget planning.
• What is the daily cycle count? For doors cycling more than 1,000 times daily, the maglock’s zero-wear design often justifies the higher upfront peripheral costs through reduced lifecycle maintenance.
• Is the door exposed to weather? Outdoor applications require weather-rated hardware for either technology. For strikes, look for IP65 or higher; for maglocks, verify that the armature plate and housing resist corrosion in the installation climate.

Engineering the Right Access Control Solution

Selecting an electric strike vs magnetic lock is not a product decision—it is a systems integration decision that must align with your door schedule, local fire code, power infrastructure, and security operational plan. The lowest hardware cost rarely yields the lowest total installed cost when code compliance peripherals and frame preparation labor are factored in.

Before you specify, compile a complete door-by-door schedule that includes frame material, fire rating, egress path designation, and anticipated daily cycle count. This document, combined with a clear understanding of your facility’s fail-safe versus fail-secure requirements, enables precise hardware selection without expensive mid-project corrections. Power supply options including 12/24V DC continuous-duty units are available to support projects of any scale. Schedule a specification review or request a sample to verify compatibility with your door frames and egress hardware.

Frequently Asked Questions

What happens to an electric strike during a power outage?

In its standard fail-secure configuration, an electric strike remains locked when power is lost. The latchbolt stays captured in the strike pocket, and the door cannot be opened from the exterior without a mechanical key. From the interior, occupants can still exit using the lever handle, panic bar, or push pad—these mechanical functions do not depend on electricity. This behavior preserves building security during outages while maintaining code-required free egress.

Fail-safe electric strikes are also available for specific applications. When power is cut, these models release the keeper and allow the latchbolt to pass freely. Verify the fail mode specification before ordering—it cannot be changed in the field on most models.

Can I use a maglock on a fire-rated door?

Technically, yes—but the installation path is more complex than for a standard electric strike. A magnetic lock on a fire-rated door must release immediately upon fire alarm activation, requiring a hardwired relay connection to the fire alarm control panel. The installation must also be reviewed and accepted by the Authority Having Jurisdiction (AHJ), which may impose additional requirements beyond what the lock manufacturer lists.

Some fire-rated doors carry labels that prohibit surface-mounted hardware on the door leaf or frame. Verify that the fire label permits the maglock mounting method before specifying. In many jurisdictions, electric strikes are the more straightforward path to compliance on fire-rated openings because they integrate with existing fire-rated panic hardware without modifying the fire assembly.

Which is more secure against forced entry?

Security against forced entry depends on the attack vector, not just the published holding force. Electric strikes with 1,200–1,500 lbs holding force resist forced entry by engaging the latchbolt physically—defeating the strike requires shearing the bolt or destroying the frame. Magnetic locks rated at 1,200 lbs holding force resist direct pulling force well, but they have vulnerabilities that strikes do not:

• Door flex: If the door flexes under pressure, the armature plate separates from the magnet, reducing holding force.
• Surface contamination: Dust, oil, or oxidation on the contact faces can weaken the bond significantly.
• Drooping door: A misaligned door that no longer sits flush against the magnet may not hold at full rating.
• Shimming attack: A thin object inserted between the armature and magnet can break the magnetic circuit, silently releasing the lock.

For perimeter security applications where forced entry resistance is the primary concern, a fail-secure electric strike combined with a robust mechanical lockset provides layered defense that a maglock alone cannot match.