Fire safety on construction sites is very important. Sites change all the time, with new layouts, temporary buildings, and many workers on site. Because of this, you need a fire alarm system that is strong, flexible, and easy to use.
The Polaris Temporary Fire Alarm System is built for UK construction sites. It gives you wireless fire detection, clear alerts, and simple control across your whole site – all at a competitive price.
Built for Busy Construction Sites
Polaris is not like a normal building fire alarm. Polaris is engineered from the ground up for temporary and changing sites.
- Quick to install
- Easy to move as your site changes
- Strong and reliable in tough conditions
The system can support up to 250 wireless devices, making it suitable for small projects and large developments. Each unit works across a range of up to 450 metres, so you can cover large or complex sites. Polaris also boasts a continuous self-fault monitoring system.
Smart Zones for Better Safety
Polaris uses zone alerts, which means only part of the site goes into alarm when needed.
This helps you:
- Avoid stopping work across the whole site, as only the area at risk will alert
- Respond faster to real problems
- Keep your project running smoothly
It’s a simple way to improve both safety and productivity.
Works Even During Power Outages
Construction sites do not always have stable power. Polaris is designed to keep working no matter what.
- The base unit uses mains power
- All other devices use long-life batteries
- Devices still work even if the mains powering the base unit fails
This means your site stays protected at all times.
Easy and Secure Alarm Control
Managing alarms is simple with Polaris. If there is a false alarm or a test, you can safely silence the system using a code.
You can do this:
- Remotely
- At the base unit
- At the alarm itself
This gives you full control while keeping the site safe.
Automatic Alerts to Key People
When an alarm is triggered, Polaris can call up to five people in order of priority.
You can also set five extra numbers for first aid alerts, helping your team respond quickly in an emergency.
Long Battery Life
Battery changes can take time and cost money. Polaris helps reduce this problem.
- Batteries last up to three years
- Less maintenance needed
- Lower running costs
This keeps your system working without regular checks.

FIREFLY Technology for Better Visibility
Polaris includes FIREFLY technology, which makes units glow in the dark.
This helps people see alarms in:
- Smoke-filled areas
- Low light conditions
- Power cuts
It makes it easier to find alarm points quickly during an emergency.
Fast and Flexible Installation
Installing a temporary fire alarm system should be quick and easy. Polaris is fully wireless, so there is:
- No need for cables
- No damage to buildings
- No complex setup
You can move and change the system as your site grows.
Easy Installation Options
Professional Installation
Our trained engineers will install and set up the system for you. This is ideal for large or high-risk sites.
Strong, Reliable, and Cost-Effective
Polaris is built for construction sites. It is:
- Tough and durable
- Reliable in all conditions
- Designed for reuse on multiple projects
When you invest in a Polaris wireless alert system, you get high performance at a competitive price.
Choose Polaris for Safer Construction Sites
If you need a temporary fire alarm system for a UK construction site, Polaris is a smarter, safer choice. It is easy to use, highly visible, and built to always keep your site safe. Learn why wireless alert systems are the best choice for UK construction sites.
To discover more about our Polaris systems, installation, or pricing, contact the Defender team today. They can help you find the right fire safety solution for your project.




