Can this be used on a 24V Hvac system? To shut the system off when the garage door is open?

Voltage would be okay, but you’d be better to use this switch to trigger an SSR as I’m not sure of the current demand of the HVAC system.

Can this be used directly in a 110v circuit with a LED (9w) lamp?

Dry closure contacts can be used in combination with a switching relay to accommodate high voltage applications.

How does this work to advise you the garage door is open?

The circuit is closed when the door is closed. When the door is open, the alarm will trip.

12v circuit in series with switch sensor and a 12v solenoid (60ma) load. Why is the switch closed permantly when activated by magnetic?

It sounds like you are attempting to use this magnetic switch to control an output device, as per the solenoid. The switch would be designed to be used as an input interrupting device to trigger an open circuit on an alarm system. Even though only 60ma draw, it may be too much for the switch to let go of the contacts under draw. Two things you can try. An alarm system would use a 4.7K ohm resistor at the end of the line of a single circuit across the + and - terminals. This would draw down any lingering power in the circuit and possibly release the contact. If you have done that and it is not fixing the error, you could try running the magnetic switch to a small trigger relay, and have the relay switch the solenoid. If you are still unsuccessful, a mechanical limit switch in place of the magnetic trigger switch would be necessary and should solve your issue.

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Heavy Duty Wired Alarm Garage Door Magnetic Contacts Switch Sensor NC with Adjustable Bracket

Heavy Duty Wired Alarm Garage Door Magnetic Contacts Switch Sensor NC with Adjustable Bracket

Product ID: 177263149

⚡380mm armored cable for durable wired connection

🔒NC contact type ensures reliable security

🔧Adjustable bracket for perfect fit

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Description

🔐 Lock in peace of mind with heavy-duty precision security!

WIDE OPERATION GAP - ≥50mm gap tolerance means flexible placement without compromising sensor accuracy.
FAIL SAFE NC CONTACT - Normally closed switch instantly triggers alarm when magnet is displaced, keeping intruders out.
RELIABLE WIRED SECURITY - 380mm armored cable ensures stable, interference-free connection to your alarm system.
PRECISION FIT ZERO HASSLE - Adjustable bracket guarantees seamless installation on any roller shutter or garage door.
BUILT TO LAST BUILT TO SECURE - Robust metal zinc alloy housing resists wear and tampering for long-term protection.

This Heavy Duty Wired Alarm Garage Door Magnetic Contacts Switch Sensor features a durable metal zinc alloy housing and an adjustable bracket for easy mounting on roller shutter and garage doors. With a normally closed (NC) contact type and a ≥50mm operation gap, it ensures reliable alarm activation when the magnet is moved. The 380mm armored cable provides a secure wired connection, making it an essential component for any home burglar alarm system.

Specifications

ASIN	B07ZBT28L8
Best Sellers Rank	#98,923 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #36 in Garage Door Sensors
Customer Reviews	4.6 4.6 out of 5 stars (197)
Date First Available	October 20, 2019
Item Weight	6.7 ounces
Item model number	MC-55ZL
Manufacturer	GAGALOR
Product Dimensions	4.17 x 1.97 x 0.79 inches

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€ 24.22

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In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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TrustScore 4.5 | 7,300+ reviews

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