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    SECO-LARM E-941SA-1K2PD Electromagnetic Lock (1,200 Lbs.) — Installation Manual

    August 31, 2026 4 min read

    Installation manual for the SECO-LARM E-941SA-1K2PD — a 1200-lb holding force electromagnetic door lock with status sensor, LED status display, and adjustable time delay.

    💾 Download Original PDF 🛒 View Product
    Full text manual (for reference)

    Installation manual for the SECO-LARM E-941SA-1K2PD — a 1200-lb holding force electromagnetic door lock with built-in status sensor, LED status display, and adjustable time delay.

    How It Works

    When power is applied, the lock's built-in electromagnet activates and is attracted to a steel armature plate mounted on the door, holding it fast against unauthorized entry. When power is cut, the electromagnet releases the armature plate, allowing the door to open. The E-941SA-1K2PD adds built-in LEDs showing electromagnet status, a status sensor that monitors whether the door is securely closed, and a built-in adjustable-delay locking timer.

    Related Products

    • E-941DA-1K2P — Double-door 1200 lb. maglock with status sensor and LED
    • E-941SA-1200 — 1200 lb. maglock without status sensor
    • E-941SA-600 — 600 lb. maglock without status sensor
    • E-941SA-300 — 300 lb. maglock without status sensor

    Mounting the E-941SA-1K2PD

    A. Drill mounting holes

    1. Fold the mounting template along the dotted line.
    2. Close the door. Find a mounting location on the door frame near the upper free-moving corner of the door, as close to the frame corner as possible.
    3. Place the template against the door and frame.
    4. Drill two holes in the door frame and three holes in the door as indicated on the template.

    Note: A filler plate, L-bracket, or Z-bracket (optional) may be required for the electromagnet depending on your door frame style.

    B. Mount the armature plate

    Use at least two steel washers and one rubber washer. Actual installation varies by door style.

    1. Put one rubber washer between two steel washers and place over the armature screw, between the armature plate and the door. This lets the plate pivot slightly to compensate for door misalignment.
    2. Tighten the sexnut bolt enough that the armature plate can withstand force from someone attempting to break down the door while the electromagnet is engaged. Do not over-tighten — the plate must still pivot freely against the door.
    3. Confirm the anti-spin guides sit properly in the two guidepin holes.

    C. Screw the mounting plate to the door frame (or optional bracket)

    1. Screw the two short self-tapping screws into the slotted holes of the mounting plate, then adjust the plate's position so it and the armature plate form a 90-degree angle.
    2. Once positioned correctly, use the long self-tapping screws to permanently mount the bracket.
    3. Remove the two short screws.

    D–H. Final steps

    1. Drill the cable access hole.
    2. Mount the electromagnet to the door frame using the Allen wrench to screw the socket-head mounting screws through the bottom of the electromagnet into the mounting bracket.
    3. Connect the power leads: open the electromagnet, run two power leads from the power supply through the cable access hole into the electromagnet, connect the leads to the terminal block, then close the electromagnet.
    4. Test the unit.
    5. Insert the tamper caps into the mounting screw access holes last — once in place they're difficult to remove.

    Wiring & Configuration Reference

    • Voltage Selection: Magnet ships from the factory set for 12VDC. For 24VDC operation, position a jumper over the two middle pins.
    • Adjustable Timer Delay: 1–78 seconds. Turn clockwise to increase the delay. The timer starts when power is applied.
    • Status Sensor Output: Monitors whether the protected door is open or closed — connect to an alarm panel or other monitoring device. N.C. = door opened (red LED on); N.O. = door closed (green LED on). Relay rated 3A @ 12VDC.
    • Status LED: Indicates lock state — Green = Locked, Red = Unlocked, Off = No power.

    Troubleshooting

    Problem Possible Cause Solution
    Door does not lock / Status LED not illuminated No power Check that wires are securely tightened to the terminal block; confirm the power supply is connected and operating; verify the lock switch is wired correctly.
    Door locks but can be easily forced open Poor contact between electromagnet and armature plate Ensure proper alignment; make sure contact surfaces are clean and free of rust.
    Door locks but can be easily forced open Incorrect voltage setting Check the power leads with a meter to confirm 12VDC or 24VDC is present.
    Delay in door releasing A secondary diode was installed across the electromagnet The electromagnet already has a built-in metal oxide varistor for interference suppression — do not install a secondary diode.
    No relay output No power / misalignment Confirm power is connected and operating; verify the lock is aligned properly; make sure NO/NC/COM are wired correctly.
    Delay in door relocking Timer setting Check that the timer is adjusted to the desired delay time.

    Regular Maintenance

    • Clean the contact surfaces of the electromagnet or armature plate with a soft cloth and non-abrasive, non-corrosive cleaner.
    • Apply a light coat of silicon lubricant to prevent rust, then wipe away excess.
    • Check that the armature plate is securely attached to the door but can still pivot slightly around the armature screw.
    • Check that the electromagnet is securely attached to the door frame.

    Specifications

    Spec E-941SA-1K2PD
    Power 12/24 VDC
    Magnet Size 10½ x 15/8 x 25/8 in. (268 x 42 x 67 mm)
    Armature Size 71/4 x 5/8 x 23/8 in. (185 x 16 x 61 mm)
    Holding Force 1200 lb (545 kg)
    Status Sensor Relay, 3A @ 12VDC
    Status LED (2-color) Locked = Green, Unlocked = Red
    Timer Delay 1–78 seconds
    Current Drain 500mA @ 12VDC, 250mA @ 24VDC
    Voltage Tolerance ±10%
    Housing Aluminum
    Operating Temperature 14° ~ 131°F (-10° ~ 55°C)
    Weight 11 lb (5.0 kg)

    Warranty

    SECO-LARM warrants this product against defects in material and workmanship for the lifetime of the product when used in normal service (1 year outside the US and Canada). Obligation is limited to repair or replacement of defective parts if returned, transportation prepaid, to SECO-LARM. Void if damage is caused by misuse, abuse, neglect, unauthorized repair/alteration, improper installation, or acts of God.

    SECO-LARM U.S.A., Inc.  •  16842 Millikan Avenue, Irvine, CA 92606  •  800-662-0800 / 949-261-2999  •  www.seco-larm.com