Is there a way to get a longer cable for the wires?

The wires can be extended with standard alarm wire.

can I use this for a 120 volt circuit, or is this low voltage only?

Low voltage, 24 ga. Wires. If you use a transformer like a doorbell transformer, it probably will work as it will be 17 vAC for that. I used it for a shut off of my garage heater so it shuts the heat off if the door opens until it lowers again.

How can I wire this to turn on a light when the garage door is open (magnet away from switch)? Use a bus bar & relay?

This is just a 2 wire sensor... so yeah, you'd definitely need a relay for the light. Then a way to trigger the relay when certain conditions are met. You could easily do that using a MIMO (multi input multi output) device and some kind of automation software. I'm using this with a Z-wave MIMO - the Zooz 700 is a solid one too if you're into that. But if you're looking to do this kind of stuff, i would recommend just using automation software like Home Assistant or something like that.

What is the lowest DC voltage that this switch will operate at?

We asked the manufacturer and they replied: "That is a passive magnetic contact. So when the magnet comes near the switch it flips state. So it can do real low voltage."

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Seco-Larm SM-4201-LQ Enforcer Track-Mount Overhead Door Magnetic Contact Switch

Product ID: 117355036

Details

Operation Mode
automatic
Current Rating
1 Amps
Operating Voltage
10 Volts (DC)
Contact Type
Normally Open
Connector Type
Wire Leads
Brand
Seco-Larm

📏Fits door channels up to 3 inches

🔒Reliable closed loop circuit compatibility

🛡️Durable aluminum housing with armored cable

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6849 som

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Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

6849 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Kyrgyzstan.

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Description

🔐 Secure your space with precision and style — don’t get left behind!

BUILT TO LAST - Rugged aluminum housing paired with 36-inch armored cable guarantees long-term durability and protection.
PLUG PLAY SECURITY - Fast, easy installation means you’re securing your space without the wait or fuss.
PRECISION MONITORING - Accurately detects open/closed status of overhead doors with a wide gap tolerance for versatile use.
UNIVERSAL FIT ZERO HASSLE - Adjustable design fits most overhead door channels up to 3 inches wide, ensuring seamless integration.
SEAMLESS SYSTEM INTEGRATION - Designed for closed loop circuits, making it perfect for professional-grade security setups.

The Seco-Larm sensor offers a robust, adjustable solution for monitoring overhead door status. Its durable aluminum housing and armored cable ensure longevity, while compatibility with closed loop circuits and easy installation make it ideal for professional security systems.

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TrustScore 4.5 | 7,300+ reviews

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