Order Alarm Accessories for Sale Online - Expand & Upgrade Your Security System
Buy alarm accessories for sale online at Communica: sensors, sirens, batteries, keypads and more. Stocked in South Africa with fast branch pickup or delivery.

Wide Accessory Selection
Keypads, remotes, batteries, contacts, sirens, and more - compatible with major alarm brands.
Local SA Stock & Pickup
Enjoy fast delivery or collect alarm accessories from Pretoria, Cape Town, or Samrand branches.
Expert Support & Quotes
Request quotes and VAT invoices for bulk, business, or education needs. Technical advice available.
Reliable Alarm Accessories for Every Security Application
Whether you're maintaining an existing alarm installation or expanding security coverage, having access to high-quality alarm accessories is vital. Communica provides a comprehensive range, available for immediate online order-perfect for home, business, industrial, or educational settings across South Africa.
Popular Alarm Accessory Types
- Sensors & Detectors - Passive infrared (PIR), magnetic door/window contacts, vibration sensors
- Keypads & Remote Controls - Wired and wireless models for system arming/disarming
- Backup Batteries & Power - Rechargeable sealed lead acid, lithium packs, power adapters
- External Sirens & Warning Devices - Indoor/outdoor sirens, LED strobe alarms, buzzers
- Expansion Modules - Zone expanders, relay triggers, wireless receivers
- Accessories - Cables, mounting boxes, tamper switches, antenna extenders
Specifications and Compatibility
It's important to consider brand/model compatibility, voltage levels, and connection types (wired or wireless). Below is a comparison of common alarm accessory types and their typical specs:
| Accessory | Typical Spec | Popular Brands |
|---|---|---|
| PIR Sensor | 12V DC, 8-12m range, NC relay output | Paradox, Optex, Texecom |
| Door Contact | Surface/recessed, NC or NO, 30-50mm gap | Elk, Nemtek, Zeta |
| Backup Battery | 12V 7Ah SLA, 12V lithium | Vision, Enertec, Generic |
| Siren | 15W-120dB, 12V DC | MS, Sirenco, Texecom |
How to Select the Right Accessories
- Match voltage and signal type (e.g., 12V relay vs open collector outputs)
- Check physical fit: mounting options and enclosure space
- Choose weatherproof ratings for outdoor devices if relevant
- Verify compatibility with your alarm control panel or wireless protocol (check datasheets if unsure)
With Communica, you can filter by product category, brand, or specification to ensure you order compatible and reliable buy alarm accessories for sale for your security system.
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Order Online for Fast Local Fulfilment
Communica understands the urgency for alarm installers and end-users needing quick replacement or upgrade parts. Most accessories are stocked at the Samrand warehouse, with availability also at Pretoria-CBD and Cape Town. Lead times for out-of-stock items are typically 2-7 working days for local brand lines.
Accessory Bundles and Related Components
- Alarm panels and expansion boards for new installs
- Full cable rolls and mounting enclosures for professional finish
- Extra remotes, batteries, fuses, and terminal blocks for regular service jobs
To simplify quoting, Communica's online system allows for VAT-inclusive bulk packs and itemised PDF quotes - ideal for property managers, campus security, and small business requirements. Educational labs and training providers can also source accessories for practical security modules.
Typical Installation Example (South Africa)
Example: Replacing a 12V 7Ah lead acid battery for an existing wired alarm in Johannesburg CBD. Simply locate replacement battery product code in the Communica catalogue, check stock at your nearest branch, and collect or add to your online cart. VAT invoice is provided on checkout. Installers report that battery changeover takes as little as 15 minutes for most makes/models.
Brands Available
- Paradox - Keypads, expansion, and sensors
- Optex - Motion and beam detectors
- Enertec - SLA batteries
- Elk, Texecom, MS, Zeta - Contacts, sirens, and other accessories
Filter by brand, accessory type, or search within Security & Alarm to find products suited to South African electrical norms and site requirements.
Sources
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
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