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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🔒 Secure your space with precision and durability — don’t let your security fall behind!

BUILT TO LAST - Rugged aluminum casing and armored cable ensure industrial-grade durability and protection.
EFFORTLESS SETUP - Fast, easy installation saves time and hassle—get your system up and running in no time.
SEAMLESS INTEGRATION - Designed for closed loop circuits, perfect for professional security setups.
UNMATCHED RELIABILITY - Rated for 50 million switch cycles with iridium-plated contacts for long-term performance.
FITS WIDE DOOR CHANNELS - Adjustable design accommodates door gaps up to 3 inches for versatile installation.

The Seco-Larm SM-4201-LQ Enforcer Track-Mount Magnetic Contact Switch is engineered for overhead doors with wide gaps up to 3 inches. Featuring a robust aluminum housing, 36-inch armored wire leads, and iridium-plated contacts, it delivers industrial-grade durability and reliable closed loop circuit monitoring. Designed for fast installation and rated for 50 million cycles, it’s the ultimate choice for professional-grade door security.