ZZ MartsDH-31 NO/NC
DH-31 Door Contact – NO/NC 3 Screw Magnetic Sensor
- Dual Contact Type – NO / NC Output
- 3 Screw Terminal Connection
- Reliable Magnetic Reed Switch
- Durable ABS Plastic Housing
- Surface Mount Easy Installation
- Compatible with Alarm & Access Control Systems
Price includes tax. Delivery calculated at checkout.
Why our price is lower
We import directly and supply the trade from two shops in Karachi and Lahore. There is no middleman between the container and you. Same product, fewer hands.
In stock, ready to ship
Limited stock1 year service warranty Void if burnt or physically damaged Claim it at either shop, or send it back — we handle the manufacturer for you. Invoice included with every order.
Will this fit my setup?
- Check the voltage your existing wiring or adaptor supplies.
- Measure the space, door thickness or bracket spacing before ordering.
- Confirm it works with the recorder, panel or app you already use.
- Still not sure? Send a photo of the old part, the door or the existing setup. We will tell you what fits - usually within minutes during shop hours.
- Free delivery on orders over Rs 5,000
- 2-3 working days to Karachi, Lahore and Islamabad · 3-5 elsewhere
- Cash on delivery available nationwide
- Order before 4pm for same-day delivery in Karachi and Lahore · prepaid orders only
- Save 4% when you pay by card or bank deposit · use code PREPAID4
- Free collection from our Karachi or Lahore shop
- Genuine product
- 7-day returns
- Secure checkout
- Trading since 2005
Not sure this is the right one? Ask us on WhatsApp - we will tell you straight.
DH-31 Door Contact – NO/NC 3 Screw Magnetic...
Rs.550.00Product details
The DH-31 NO/NC Door Contact (3 Screw) is a magnetic sensor designed for security alarm and access control systems to detect door or window opening.
This model includes three screw terminals, allowing both Normally Open (NO) and Normally Closed (NC) configurations from the same sensor. This flexibility makes it suitable for different alarm panel wiring requirements.
The device consists of a magnetic reed switch and a magnet. When the door is closed, the magnet keeps the sensor in its normal state. When the door opens and the magnet moves away, the contact changes state and sends a signal to the alarm panel. Magnetic door contacts like the MC-31 series are commonly used in wired alarm systems and typically detect door gaps around 15–25 mm depending on installation.
Its compact design and durable ABS casing allow installation on wooden, aluminum, or metal doors and windows.
You can buy this door contact from ZZ Marts, with stores in Karachi and Lahore and delivery across Pakistan.
Specifications
| Model / SKU | DH-31 NO/NC |
|---|
Specifications are provided by the manufacturer and may change without notice. Please confirm before installation.
Frequently asked questions
What wiring does this DH-31 offer?
It is a 3-screw magnetic contact with both NO and NC terminals, so it suits either alarm-panel wiring.
Where is it used?
Doors and windows on alarm systems. Browse more Door Sensors & Relay Modules.
Do you deliver nationwide and is there a warranty?
Yes — nationwide delivery, cash on delivery, 1-year warranty.
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