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Electric Lock

Surface Mount Magnetic Lock |AL-SM-280S

  • ISO9001ISO 9001
  • CMACMA
  • PATPATENTPatent

Product Introduction: The AL-SM-280S is 280kg surface mount magnetic lock (280kg Surface Mount Magnetic Lock / 600lbs EM Lock) is the most widely used single-door electric lock in access control systems. It works on the electromagnetic adsorption principle: when powered, the lock body and armature…

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Product Introduction:

The AL-SM-280S is 280kg surface mount magnetic lock (280kg Surface Mount Magnetic Lock / 600lbs EM Lock) is the most widely used single-door electric lock in access control systems. It works on the electromagnetic adsorption principle: when powered, the lock body and armature plate generate a horizontal holding force of approximately 280kg (600lbs) to lock the door; when power is cut, it releases immediately, complying with fire control linkage requirements. The surface-mounted design requires no mortise cutting in the door and is installed on top of the door frame, making it quick to install and easy to maintain. It is the standard configuration for offices, residential communities, factories, and commercial doors.

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Product Features:
– 280kg / 600lbs holding force: Suitable for most indoor single doors, including wood, fire-rated, glass, and metal doors.
– Fail-safe (unlocks on power loss): Releases automatically when power is cut, meeting fire inspection requirements; personnel can push the door open in emergencies.
– Surface-mounted design: No mortise cutting needed; the lock body is mounted on the door header, enabling fast installation and easy maintenance.
– Pure copper coil + epoxy potting: Low temperature rise, quiet operation, no mechanical wear, long service life (over 500,000 cycles).
– Reverse polarity protection / surge protection: Will not burn out if polarity is reversed; resistant to voltage fluctuations.
– LED status indicator: Lock status visible at a glance (red = locked, green = open).
– Door position signal (optional): With door status detection output, the access controller can indicate “door not closed properly.”
– Aluminum alloy housing: Anodized for rust and corrosion resistance.
Applications:

– Offices, commercial buildings, meeting rooms
– Residential unit doors, apartment doors, condominiums
– Factories, warehouses, server rooms
– Schools, hospitals, government buildings
– Commercial doors, fire-rated doors, fire exits
– Suitable for indoor and semi-outdoor (sheltered) environments; not recommended for direct rain exposure (use weatherproof models or install under eaves for outdoor use).

Product Details:
Product Details:
Product Details:

Technical Specifications

Order Model:
AL-SM-280S
HS Code:
8301.40.0000
Holding Force
280kg (600lbs)
Operating Voltage
DC 12V (DC 24V customizable)
Current Draw
Approx. 500mA at 12V (startup ≤0.5A, holding 0.45A)
Power Consumption
Approx. 6W
Lock Mode
Fail-safe (unlocks on power loss)
Armature Plate Dimensions
Approx. 180 × 38 × 11 mm
Finish
Anodized aluminum
Insulation Resistance
≥100 MΩ
Operating Temperature
-10°C to +55°C
Relative Humidity
0–95% (non-condensing)
Signal Output
Door position sensor (optional), LED indicator
Suitable Door Thickness
40–60 mm (other types with brackets)
Door Types
Wood, steel, fire-rated, glass, and sliding doors
Package Size:
2650mm-65mm-65mm
Weight :
1.6KG

Technical Documents

Datasheets, wiring diagrams and installation drawings for this model — free to download, no registration.

PDF

检测报告280单门双门

18 MB Updated: Oct 2026
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Frequently Asked Questions

It is an electric door lock used in access control systems. It consists of a lock body and an armature plate. When powered, the electromagnet generates a strong holding force to keep the door locked; when power is cut, it releases immediately.

This model has a holding force of 280kg (600lbs), which is suitable for most standard single doors.

A surface mount lock is installed on the top of the door frame and is visible, requiring no cutting into the door. A mortise or concealed lock is embedded inside the door or frame, so it is hidden but more difficult to install.

It is fail-safe. When power is lost, the lock opens automatically. This is a fire safety requirement and allows people to exit in an emergency.

The standard model works at DC 12V. A DC 24V version can be customized.

At 12V, the current is about 500mA; power consumption is around 6W.

It works with wood doors, steel doors, fire-rated doors, glass doors, and sliding doors. Brackets may be required depending on the door type.

It depends on the door. A Z bracket is commonly used for inward-opening doors, an L bracket for outward-opening doors, and Z&L or U brackets for glass doors. Wood doors opening inward can often use the lock directly.

It is designed for indoor and semi-outdoor (sheltered) locations. It should not be directly exposed to rain. For outdoor use, please install it under a cover or choose a weatherproof model.

Yes. It is compatible with RFID access controllers, keypads, fingerprint readers, door exit buttons, and intercom systems.

Yes. Because it is fail-safe, it unlocks automatically when power is cut. It can also be connected to an uninterruptible power supply (UPS) if you want the door to remain locked during an outage.

It uses a pure copper coil with epoxy potting and has no mechanical wear parts. Its service life is typically over 500,000 cycles.

Yes. A red LED indicates the door is locked, and a green LED indicates it is open.

A door position sensor (DPS) is optional. With it, your access controller can detect whether the door is open or closed.

The package includes the lock body, armature plate, mounting screws, rubber gasket, copper sleeves, positioning pin set, and an installation manual. Brackets are optional.