Genie Narrow Magnetic Down Limit Switch – 33950S – Excelerator / Screw Drive

Restore proper closed-position control on a compatible Genie garage door opener with this genuine Genie narrow magnetic down-limit switch.

This switch mounts near the door end of the opener rail and works with the opener carriage to tell the motor when the garage door has reached its fully closed position.

It is designed for select older Genie Excelerator and screw-drive garage door openers and includes the attached brown wire.

Specifications

What the Down Limit Switch Does

The down-limit switch tells the opener when the garage door has reached its correct fully closed position.

As the carriage travels toward the door, the magnetic limit system activates the switch. The opener then stops the motor at the proper closing point.

A properly functioning down-limit switch helps prevent the opener from:

• Traveling too far in the closing direction

• Stopping before the door reaches the floor

• Continuing to drive after the door is closed

• Operating inconsistently at the closed position

Compatible Genie Models

Genie lists this magnetic down-limit switch for compatible models including:

• 4060L

• H8000

• ISD990

• ISD995

• ISD1000

• 4560

• PRO99

• CMD9900

Always verify the exact model number on your opener before ordering.

Narrow Magnetic Design

This is the narrow magnetic version used on compatible Genie Excelerator-style rail systems.

Genie also produced wider magnetic limit switches and mechanical limit switches for other opener families.

These different styles are not automatically interchangeable.

Before ordering, compare:

• Existing switch width and shape

• Wire color

• Magnetic versus mechanical design

• Rail configuration

• Opener model number

Brown Wire – Down Limit

This down-limit version uses the brown wire and is installed toward the door end of the rail.

Its matching up-limit counterpart uses a different configuration and is positioned toward the powerhead end of the rail.

Do not interchange the up and down switches without verifying the opener's wiring and installation requirements.

Common Symptoms of a Faulty Down Limit Switch

Inspect the down-limit switch if your compatible Genie opener:

• Will not stop at the correct closed position

• Stops before reaching the floor

• Continues pushing after the door is closed

• Has intermittent closing travel

• Has visible damage to the limit switch

• Has damaged or disconnected limit wiring

• Has a magnetic switch that no longer activates reliably

Travel problems can also be caused by the control board, carriage, rail components, wiring, or other opener parts, so inspect the complete system before replacing components.

Compatibility & Fitment

This switch is not universal for every Genie opener.

It is intended for compatible Genie screw-drive and Excelerator systems using this specific narrow magnetic-limit configuration.

Before ordering, verify:

• Genie opener model

• Existing magnetic switch style

• Brown down-limit wire

• Rail type

• Existing switch location

• Existing connector and wiring arrangement

Installation Notes

Before replacing the limit switch:

1. Close and secure the garage door.

2. Disconnect electrical power to the opener.

3. Locate the existing down-limit switch near the door end of the rail.

4. Note the exact position of the existing switch.

5. Disconnect the existing wiring.

6. Remove the old switch.

7. Install the replacement in the same rail position.

8. Reconnect the wiring correctly.

9. Restore power.

10. Test the full opening and closing cycle.

The switch position determines where the opener stops, so adjustment may be required after installation.

Difference From the Wide Magnetic Limit Switch

Genie also uses a wide magnetic down-limit switch on several Chain Glide opener models.

This narrow version is intended for compatible Excelerator / screw-drive systems and should not be substituted for the wide Chain Glide version solely because both are magnetic switches.

Always match the switch to the opener model and rail system.

Ready to Order?

If your compatible Genie opener uses the narrow magnetic down-limit switch with brown wire, this genuine Genie replacement is designed to restore proper closed-position travel control.

Add it to your cart today and restore reliable down-limit operation to your Genie garage door opener.

Safety Warning

⚠️ Disconnect electrical power before servicing a garage door opener or rail-mounted electrical component.

After installation, test the complete opening and closing cycle and verify that the door stops correctly in both directions.

Do not adjust or service garage door springs, cables, bottom brackets, or other components under spring tension while replacing opener parts.