Your questions about our photovoltaic fire protection switch - our answers
On this page you will find answers to the most frequently asked questions about the functions, installation, use and maintenance of our QFire photovoltaic fire protection switch.
Our aim is to provide you with comprehensive information so that you can take full advantage of our product.
Should you have any further questions, please do not hesitate to contact us here.
>> We also offer online training for our fire department switch
Where is the fireman's switch installed?
The photovoltaic fire protection switch is installed immediately before or after entering the building - as close as possible to the generator.
The housing has IP class 66/67 and is therefore suitable for outdoor use (weather-protected/shaded).
How can it be retrofitted?
The fireman's switch is simply and easily installed in the string between the PV modules and the inverter.
Thanks to its customized design, our QFire adapts to your local conditions.
What is the maximum cable length of the control cable between the control box and the switch box?
300 meters | 1,000 meters
Can we also connect more or fewer strings?
As we build the photovoltaic fire protection switches to customer specifications, we can also offer other quantities of strings.
Simply send us your requirements, a specification or the network overview plan of your system to be planned and we will dimension the QFire accordingly.
We can also reduce the number of strings if, for example, you need fewer outputs than inputs!
What type of connector do you use with the DC isolator?
We pay attention to brand quality and use the original MC4-Evo 2 connectors from Stäubli(see here).
However, as we build the boxes to customer specifications, we can also use Sunclix or any other PV connector on request - or we can supply the fireman's switches with cable glands!
How high may the maximum system voltage per string be?
Our relays can handle 1,500 VDC and other ranges on request.
How high is the self-consumption of the relays used?
The relay is a version with low coil power and a consumption of < 1 W.
Is the QFire photovoltaic fire protection switch certified?
QFire is a PV generator disconnection device for the automated galvanic isolation of PV strings in accordance with DIN EN 60947-3:2020. Our fire department switch is also certified to this standard.
Where are the QFire free switches built?
We produce our fire department switches on our premises in Kaufbeuren.
The goods are also shipped from there.
Do the boxes have to be mounted horizontally or vertically?
The orientation of the box is not really relevant.
It should be installed in the shade and protected from the weather.
Is there a difference between DC-21B and DC-21A from competitors?
These are mechanical switches.
We offer an electronically controlled switch that switches off automatically even if the AC supply is lost and also switches on again automatically!
In addition, we build the fireman's switches to customer and system specifications.
What is the installation cost?
We plan the fire department switches to suit your system and wire them internally.
You will receive the appropriate mating connectors from us, which you connect to the control cable - done!
What if I need an EMERGENCY OFF or key switch?
No problem, you can generally connect an external switch to our control boxes, whether emergency stop, emergency stop behind glass or key switch.
What if a PV system is extended with your fireman's switch?
Then we simply supply you with additional activation boxes with the required number of strings, which you integrate into the existing system!
If another building is to be equipped with PV, we can also swap the control box for the cluster control box, which allows up to 5 different roof areas to be switched off simultaneously.
Do I need an additional GAK with overvoltage protection?
If you require additional surge protection close to the generator, we will integrate this into the fireman's switch!
Do you also offer your photovoltaic fire protection switch with fuses?
We build according to your specifications!
Simply let us know whether you want the fuses in the positive and/or negative pole.
We know that some applications require fuses.
Do you have any further questions?
Write to us at info@q3-energie.de, we will answer all your questions and include them here in the FAQs!
