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.

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

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

Product ID: 547128684

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⚡28V DC max switching voltage

🔒NC contact type for fail-safe security

🛠️Adjustable bracket for versatile mounting

Description

🔐 Elevate your home security with the sensor that means business.

WIDE ≥ 50 MM OPERATION GAP - Generous detection range means fewer false alarms and smarter sensing.
HEAVY DUTY 380 MM ARMORED CABLE - Reinforced wiring ensures long-lasting, tamper-resistant connections.
PLUG PLAY WIRED CONNECTIVITY - Simple two-wire setup compatible with most home automation systems.
ADJUSTABLE BRACKET FOR PERFECT FIT - Customizable mounting angles for seamless integration on any garage or roller shutter door.
ROCK SOLID METAL ZINC ALLOY HOUSING - Durability that outlasts cheap plastic sensors, built for serious security.

The GAGALOR Heavy Duty Wired Alarm Magnetic Garage Door Contact Switch Sensor MC-55ZL features a robust metal zinc alloy housing and an adjustable bracket for easy surface mounting. Designed for roller shutter and garage doors, it offers a reliable NC (normally closed) contact type with a wide ≥50mm operation gap and a durable 380mm armored cable. Operating at up to 28V DC and 3W load, this sensor delivers dependable, long-lasting performance for professional-grade home security systems.

Specifications

ASIN	B07ZBT28L8
Batteries Included	No
Batteries Required	No
Best Sellers Rank	#259,370 in Home Improvement ( See Top 100 in Home Improvement ) #877 in Home Security Alarms
Brand	GAGALOR
Country of Origin	USA
Customer Reviews	4.5 4.5 out of 5 stars (180)
Date First Available	10 April 2020
Includes Rechargeable Battery	No
Item Dimensions LxWxH	10.6 x 5 x 2 Centimeters
Item Weight	290 g
Item model number	MC-55ZL
Manufacturer	GAGALOR
Model	MC-55ZL
Mounting Type	Surface
Power Source	dc
Product Dimensions	10.6 x 5 x 2 cm; 290 g
Special Features	All metal case with good quality, ≥ 60mm big operation distance
Wattage	3 Watts

Reviews

M**.

More clarity is needed of NC vs NO when magnet is near contacts

14.03.2024

T**N

Excellent Replacement and Upgrade

21.03.2025

P**C

23.09.2025

S**R

Work perfectly w/ home automation system

22.12.2024

M**L

Rubbish - found out too late (by a few days) to return

3.11.2025

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