Class B amplifiers
Most high-power sirens use class D amplifiers. eRotor uses class B: a cleaner signal, fewer failures and a thermal fuse. Rated for 20–30 minutes of continuous alarm — enough for most warning regulations.
Tausec · siren manufacturer for system integratorseRotor modular
eRotor modular
warning sirens.
Electronic sirens for integrators who build flood-warning, civil-protection and industrial alarm systems. You can buy eRotor as a complete siren, as a 250 W training kit or module by module — electronics developed and built in the EU.
115 dB(A)
at 30 metres from the most common 500 W eRotor — the level a conventional siren needs about 1,200 W for.
2–3 dB(A)
more sound at 30 metres than comparable sirens, in certified comparative measurements.
250–1,500 W
one platform from 2 to 12 horns, built from the same five modules.
Why it is worth a look500 W that sounds
500 W that sounds
like 1,200 W.
A 500 W eRotor — two amplifiers, four horns — reaches 115 dB(A) at 30 metres. A conventional siren needs about 1,200 W for the same level. For your project that means fewer horns per site, a lighter mast and lower transport and installation cost.
What dB(A) means
Sound level is measured in dB(A) — decibels weighted the way the ear hears. Every 3 dB(A) roughly doubles the acoustic energy. In certified comparative measurements eRotor delivers 2–3 dB(A) more at 30 metres than comparable sirens.
115 dB(A)
from 500 W
Measured at 30 metres, the standard distance for large sirens. 500 W is the configuration most partners order.
+2–3 dB(A)
certified advantage
Independent comparative measurements, A-weighted. Every 3 dB(A) roughly doubles the acoustic energy that reaches people.
121 dB(A)
at 1,500 W
The largest configuration: four amplifiers and twelve horns for wide, open areas.
What it is made ofFive modules.
Five modules.
Nothing hidden.
Every eRotor, from 250 to 1,500 W, is built from the same five modules. The electronics sit in one cabinet indoors or in a protected enclosure; the horns go on a mast. Replace one module during service instead of the whole siren.
01
Control unit
Generates the warning signal, stores tones and voice messages on an MMC memory card and runs the self-test of amplifiers, horns and battery charging.
Tones on MMC card · AUX voice input
02
Power supply
A separate module, deliberately. High currents stay away from the control unit, so the signal it generates stays clean.
Own module, own circuit
03
Class B amplifiers
Tausec’s own amplifiers, always in pairs so the siren plays in stereo. Integrated thermal protection shuts an amplifier down before it overheats.
375 W each · 2 or 4 per siren
04
Battery charger
Monitors and manages the charging of the two 12 V batteries the siren runs from. Its status is part of the self-test.
2 × 12 V, 24–65 Ah
05
Aluminium horns
Cast aluminium alloy with a pressure driver inside. The alloy does not rust or degrade, so the horn keeps its acoustic properties for decades.
13 kg each · 25+ years
Where the extra decibels come fromThree engineering
Three engineering
decisions.
The 2–3 dB(A) advantage is not a tuning trick. It comes from three choices in how the electronics are built.
A separate power supply
The power supply is its own module, so high currents never disturb the control unit that generates the signal. The separation alone is worth 2–4 dB of clean output.
Horns in stereo pairs
Left and right horns receive signals shifted by a few hertz, so the sound waves add up instead of cancelling out. That is why amplifiers always come in pairs.
All specificationsFive sizes.
Five sizes.
One platform.
Choose the size by the area you need to cover. All sizes use the same modules, the same software and the same documentation.
| eRotor | 250 W | 500 W | 750 W | 1,000 W | 1,500 W |
|---|---|---|---|---|---|
| Sound level at 30 m | 110 dB(A) | 115 dB(A) | 117 dB(A) | 119 dB(A) | 121 dB(A) |
| Horns | 2 | 4 | 6 | 8 | 12 |
| Amplifiers (375 W each) | 2 | 2 | 2 | 4 | 4 |
| Cabinet with batteries | 38 kg | 50 kg | 50 kg | 70 kg | 70 kg |
| Cabinet dimensions (mm) | 800×600×250 | 800×600×250 | 800×600×250 | 800×1000×350 | 800×1000×350 |
| Horns with drivers | 27 kg | 54 kg | 80 kg | 108 kg | 165 kg |
Common to all sizes
Mains supply230 V (115 V)
Backup batteries2 × 12 V, 24–65 Ah
Alarm on batterymin. 15 minutes of alarm, min. 72 hours without mains
Standby on batterymore than one week
Alarm tonescustomisable, stored on an MMC memory card
Voice messagesAUX input for live or recorded voice
The most common configuration is 500 W: two amplifiers, four horns, 115 dB(A) at 30 metres.
Full datasheet (PDF)
How it fitsYour system decides.
Your system decides.
eRotor sounds.
Tausec provides the siren hardware, configuration software and technical know-how. The system integrator provides the wider control, communication, installation and local service. This is how the two meet in a typical project.
- 01
Yours
Sensor or operator
A water-level sensor crosses a threshold, or an operator watching the situation decides to warn.
- 02
Yours
Control logic
Your control system evaluates the event according to local rules and decides which sirens sound and when.
- 03
Yours
Communication
The command travels over your network: radio modem, a relay contact, or IP through a converter.
- 04
Tausec
eRotor
The siren receives the command on one of its inputs, plays the stored tone or voice message and reports its self-test status.
- 05
Result
Acoustic warning
People within range hear the warning — 115 dB(A) at 30 metres from a 500 W siren.
Tausec provides
- eRotor sirens and individual modules
- Configuration and diagnostic software (Windows, RS-232)
- Technical documentation and installation know-how
- Replacement modules and warranty support
You provide
- Control system and triggering logic
- Communication layer — radio, relay / binary input or IP via RS-232 converter
- Local installation, certification and service
- The final solution for your customer
Tausec does not sell central multi-siren management. The configuration software works with one siren at a time; the network of sirens is your layer.
Triggering and softwareFive ways
Five ways
to trigger it.
Not “flexible architecture” — these are the inputs on the cabinet. The choice depends on your project and local rules; the siren supports all of them.
Local control panel
Keypad with an LCD on the cabinet for manual start, stop and tests on site.
Relay / binary input
A contact from a water-level sensor, a safety system or an operator’s switch. Also how most sensor-driven projects trigger the siren.
Radio modem
A modem in the cabinet receives commands over your radio network.
RS-232, open protocol
Documented two-way commands you integrate into your own control software, so your system can start the siren and read its status.
IP via converter
An IP-to-RS-232 converter module puts the siren on your IP network without changing its electronics.
Configuration software
Tausec’s own Windows tool connects to one siren over RS-232: upload warning tones and voice messages, calibrate, run the self-test and control the siren locally.
Self-test
Built into the control unit: it checks each amplifier, each loudspeaker and the battery charging. The tested parameters are fixed at the factory.
What you can buyThree forms of
Three forms of
the same siren.
Choose the form that fits your team. Most new partners start with complete sirens and move to modules once they know the platform.
With every order
Technical documentation, a price list for modules and complete sirens, the configuration software, replacement modules, warranty — and our engineers when a project needs a custom module.
Delivery
Modules in stock ship within about a week; built to order takes up to four weeks. Air freight about a week, sea freight one to two months for larger orders.
01
Complete eRotor
Configured and tested, with installation documentation. Most new partners start here. Comes with installation instructions and Tausec technical support.
250–1,500 WConfigured and testedInstallation documentation
02
Siren Kit
A working 250 W siren — control unit, two amplifiers, two horns — wired with plug connectors so your technicians learn how the modules connect and disconnect. Sell it afterwards as a finished product.
250 W, 2 hornsPlug connectorsOne-time price
03
Individual modules
Order only the modules you need and assemble sirens in your workshop, once your team knows the platform. You offer the siren as your own solution and service it with replacement modules.
Five module typesPrice per moduleYour workshop
EvidenceThree questions.
Three questions.
Three facts.
Before you add an unknown manufacturer to a tender, you want answers to three questions. Here they are, with the source next to each.
Does it perform?
+2–3 dB(A)
More sound at 30 metres than comparable sirens, in certified comparative measurements, A-weighted — the measure that matters for warning people.
Certified acoustic measurementCan they build it?
Since 2007
Amplifiers, control units and power supplies are Tausec’s own design, built in the EU; the horns are cast in the Czech Republic. CE certified.
Own development and productionHas anyone deployed it?
≈250 sirens
An ongoing government flood-warning project in Malaysia: eRotor sirens triggered by water-level sensors or operators warn river towns to evacuate.
Malaysia · state project, ongoing
≈250 eRotor sirens
along Malaysian rivers.
On the mastBuilt to work when
Built to work when
the grid does not.
15 min
of alarm on battery
At least 15 minutes of alarm and 72 hours without mains, from two 12 V batteries charged from mains or solar.
1 week+
on standby
More than a week on standby when the grid fails — usually the first thing to go in a crisis.
25+ years
horn service life
Cast aluminium alloy horns withstand heat, frost and salt air for 25 years and more; the electronics cabinet is installed indoors or in a protected enclosure.
1 day
to install
Mount the cabinet, fix the horns to a prepared mast, connect, configure, run the self-test — typically one working day when the site is ready.
The siren runs from two 12 V batteries charged from mains or solar. If the grid fails — usually the first thing to go in a crisis — it keeps working: more than 15 minutes of alarm, over a week on standby.
Service
A yearly check, loudspeakers replaced when worn, batteries every 3–4 years. Replace a module, not the siren.
FAQQuestions integrators
Questions integrators
ask first.
What does an eRotor cost?
Prices depend on the size, the quantity and whether you buy complete sirens, the Siren Kit or modules. Partners receive a price list with both module prices and complete-siren prices — write to us with your application and quantity.
Which size do I need?
The size follows the area you need to cover. The most common choice is 500 W: two amplifiers, four horns and 115 dB(A) at 30 metres. The datasheet lists all five sizes from 250 to 1,500 W.
Why should I care about dB(A) and not dB?
dB(A) is filtered the way the human ear hears; dB(C) is linear and does not match how people actually hear. Sirens warn people, so only dB(A) says how loud the warning really is.
Can I connect eRotor to my existing control system?
Yes. It accepts a relay contact, commands over RS-232 with an open two-way protocol, a radio modem, or IP through a converter module. The triggering logic stays in your system.
Does Tausec provide central management for many sirens?
No. The configuration software works with one siren at a time over RS-232. Managing a network of sirens is the integrator’s layer — you design it for local rules and service it yourself.
What is the Siren Kit for?
It is a working 250 W siren with two amplifiers, a control unit and two horns, wired with plug connectors. Your technicians learn how the modules connect, and you can sell the kit afterwards as a finished siren.
How long does delivery take?
Modules in stock are configured and shipped within about a week; built to order takes up to four weeks. Air freight takes about a week, sea freight one to two months — usual for larger orders because each horn weighs 13 kg.
Who handles installation, certification and service?
You do, locally — Tausec supplies the CE-certified siren, installation documentation, warranty and replacement modules. A typical installation takes one working day when the mast and power are ready.
Next step
Evaluate eRotor.
Tell us the application, quantity and how you plan to trigger the sirens. You will receive a recommended configuration, documentation and pricing. Remember the short version: 500 W that sounds like 1,200 W.