Technical Foundation
What Is a Electromagnetic Lock Power Supplie?
An electromagnetic lock (maglock) draws continuous holding current whenever it's engaged, unlike an electric strike that only pulses briefly to release — this makes a properly sized, regulated power supply essential, since undervoltage under sustained current draw reduces holding force and voltage spikes on release can damage connected access control electronics. Power supplies for maglocks include a diode or suppression circuit across the output specifically to absorb the inductive voltage spike generated when the lock's coil de-energizes.
Fire and life-safety code requires maglock systems to fail safe (unlock) on loss of power or upon a fire alarm signal, so most power supplies include a dedicated fire alarm interface relay that immediately cuts lock power when triggered, and many include battery backup to maintain access control function (though not necessarily the lock itself) during a power outage — the specific fail-safe wiring and backup behavior must comply with the local fire and building code for the occupancy type.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Output Voltage | 12VDC, 24VDC, or field-selectable 12/24V | Must match the maglock's rated voltage — many locks specify a fixed voltage, others a range |
| Current Capacity | 0.5-10+ amps depending on lock count/size | Must exceed total continuous current draw of all connected locks with margin |
| Number of Outputs | Single-door to multi-door (4, 8, 16 outputs) | Determines how many separate locks/doors one power supply chassis can serve |
| Fire Alarm Interface | Dedicated relay input for fire alarm system tie-in | Required by most fire/life-safety codes to force unlock on fire alarm activation |
| Battery Backup | Optional integrated battery charging circuit | Maintains access control function during a power outage per code and site requirements |
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Applications
Where Electromagnetic Lock Power Supplies Get Used
Electromagnetic lock power supplies are specified anywhere a maglock-based access control system needs reliable, code-compliant, surge-protected DC power.
Commercial Building Access Control
Powering electromagnetic locks on main entry and interior secured doors tied into a card access system.
Data Centers & Server Rooms
Reliable, backed-up power for high-security maglock installations protecting critical infrastructure.
Healthcare Facility Security
Access-controlled maglocks on restricted areas such as pharmacies and record rooms, with fire alarm interface.
Educational Facility Security
Multi-door maglock power supplies serving campus buildings with centralized access control.
Government & High-Security Facilities
Redundant, battery-backed power supplies for mission-critical secured entry points.
Multi-Tenant Office Buildings
Centralized power supplies serving maglocks across common area and tenant suite entries.
FAQ
Electromagnetic Lock Power Supplies Questions, Answered
Why can't I use a generic DC power supply for an electromagnetic lock?
A maglock draws continuous current while engaged and generates a significant inductive voltage spike when it de-energizes. Purpose-built lock power supplies include suppression circuitry to absorb that spike and are regulated to maintain full holding voltage under sustained load — a generic supply may let voltage sag under continuous draw, reducing the lock's holding force, or let the spike damage connected access control equipment.
Do electromagnetic lock power supplies need a fire alarm interface?
In most jurisdictions, yes — fire and life-safety code requires maglock-secured doors to unlock automatically on a fire alarm signal, so the power supply needs a dedicated interface relay wired to the building's fire alarm system to cut lock power immediately upon alarm activation. Requirements vary by occupancy type and local code, so confirm with the authority having jurisdiction.
How do I size the current capacity for multiple locks on one power supply?
Add up the continuous current draw (in amps) of every lock that will be connected to that power supply's output, then choose a supply rated above that total with reasonable margin for voltage drop and future additions — undersizing causes voltage sag and reduced holding force across all connected locks.
What does 12/24V selectable mean on a power supply?
It means the power supply can be configured, usually via a jumper or dip switch, to output either 12VDC or 24VDC, letting the same unit serve maglocks rated for either voltage rather than needing separate fixed-voltage models stocked for each.
Is battery backup required on access control power supplies?
It depends on the facility's security and life-safety requirements — battery backup keeps the access control system (and often the lock itself, depending on fail-safe design) functioning during a power outage, which some codes and security policies require for critical or high-security access points, but it isn't universally mandated.
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