Dahua ARD312 Wired Metal Door and Window Contact

Overview

The Dahua ARD312 Iron Door Contact is a wired magnetic door and window contact in a hard metal-plated housing. A switch body and a magnet are fixed to the frame and the door; opening the door separates them and opens the normally closed circuit to the alarm panel. It is made for places where plastic contacts get damaged or do not hold up: steel doors, rolling shutters, warehouse gates, ATM and safe-room doors and industrial cabinets.

Is it right for you?

• It suits steel doors, shutters and gates, where a plastic contact would be damaged or the metal would weaken the magnet.
• With a 35 mm operating gap it tolerates loose-fitting shutters and gates.
• For a wooden or uPVC frame, the plastic ARD313 is the lighter option.

Key features

• Metal-plated casing in silver grey, harder than a plastic contact.
• Normally closed (NC) output rated 100 V DC, maximum 500 mA.
• Triggers when the gap between body and magnet reaches 35 mm or more.
• Works without a power supply.
• Surface mounting; 18 x 10 x 50 mm, 54 g.
• Operating range -10 to 55 °C.

What else you need

A zone on a wired alarm panel such as the Dahua ARC2008C-V3 or ARC2016C-V3, or an ARM808-RS input expansion module, and alarm cable. For a wireless system, connect it through a wireless input transmitter such as the ARM310-W2.

Installation

An alarm installer should fit it. Fix the switch body to the frame and the magnet to the door or shutter, aligned with the gap under 35 mm when closed, and route the cable through conduit on exposed steel frames to protect it from cutting.

Before you buy

• Protect the cable in conduit on exposed steel frames.