Introduction

The lock is the most critical safety component in any smart locker system. Choose the wrong type and you will face reliability issues, integration headaches, or unexpected power consumption that undermines the entire deployment. Yet the choice between a solenoid lock and an electromagnetic lock is rarely explained clearly in supplier catalogs.

This guide breaks down the engineering differences, practical tradeoffs, and selection logic for the two dominant electronic lock types used in smart cabinets, parcel lockers, gym lockers, and industrial storage solutions.

How a Solenoid Lock Works

A solenoid lock uses an electromagnetic coil to retract or extend a metal bolt (plunger). When voltage is applied, the coil generates a magnetic field that pulls the plunger back, releasing the door. When power is cut, a spring returns the plunger to the locked position.

This fail-secure design means the locker stays locked when power is off — ideal for high-security applications. Solenoid locks are available in 12V and 24V DC versions and are typically controlled by a single digital output signal from the controller board.

How an Electromagnetic Lock Works

An electromagnetic lock (also called a maglock) uses a continuously energized electromagnet to hold a metal armature plate against the lock body. As long as current flows, the door is held shut. Cut the power and the door releases immediately.

This fail-safe design means the door opens automatically on power failure — suitable for fire safety compliance applications. Maglocks provide very high holding force (200–600 kg for cabinet-grade units) but require continuous power consumption to stay locked.

Side-by-Side Comparison

·         Power behavior: Solenoid = fail-secure (locked when power off). Maglock = fail-safe (unlocked when power off).

·         Power consumption: Solenoid draws power only briefly during unlock (low average consumption). Maglock draws continuous power while locked (higher average consumption).

·         Holding force: Solenoid typically 50–200 N. Maglock typically 200–600 N.

·         Noise: Solenoid produces a noticeable click on operation. Maglock is silent.

·         Door compatibility: Solenoid requires a matching strike plate on the door. Maglock requires an armature plate and works with most flat door surfaces.

·         Cost: Solenoid locks are generally lower cost at the same holding force.

Which Lock Type Is Right for Your Smart Locker?

Choose solenoid locks when:

·         Security is the priority: the locker must stay locked during a power outage (server room, medicine cabinet, industrial tool storage)

·         Power efficiency matters: battery-backup systems or solar-powered outdoor lockers benefit from solenoid's low average current draw

·         Cost per door is a constraint: large deployments with 40–100 doors benefit from solenoid's lower unit cost

Choose electromagnetic locks when:

·         Safety codes require fail-safe operation (emergency evacuation scenarios)

·         Silent operation is required (hospital, library, office environments)

·         Very high holding force is needed without a mechanical bolt

DEWOD Lock and Controller Board Solutions

DEWOD supplies both solenoid lock types (S150, S220, S260, S320) in 12V and 24V variants, along with a full range of controller boards (SK12, SK24, XG3028) supporting 12 to 100 channels via RS485 communication. All locks and boards are designed to work as a system, with matching connectors and verified compatibility.

For custom smart locker projects, DEWOD can supply locks, controller boards, touch panels, barCode Scanners, and OEM cabinet assemblies as a single-source solution.

Conclusion

The solenoid vs electromagnetic lock decision comes down to your power-failure safety requirement and power budget. For the majority of smart locker, parcel cabinet, gym locker, and vending machine applications, solenoid locks are the right choice — lower cost, fail-secure, and easy to integrate with standard controller boards. Contact DEWOD to discuss your specific locker project requirements.

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