Fireman's switch for PV systems in accordance with IEC 60947-3
Customized system - also with overvoltage protection! With the Q Fire Switch, all lines from the disconnection box on the roof are electrically isolated from the PV generator in the event of switching. This means that all DC cables in the building are de-energized. Switching takes place via the control box, which is ideally installed near the inverters or connected to another point in the AC grid.
- Safe disconnection of the PV generator even in an emergency
- AC-coupled, can therefore be triggered at any time via the mains supply
- Arc-free switching thanks to modern switching technology
- The Q-Fire control box can be switched on and off using an external key switch
- Complete set; modularly expandable and easy to install
- Switches back on automatically after a power failure
The main advantage of the system with AC-coupled switch-off is that, for example, in the event of a fire, there is no need to search for a switch or it is no longer accessible. When the AC grid is switched off, the DC lines from the switch box on the roof are also automatically disconnected. When the AC grid is reconnected, the system automatically goes back into operation.
The basic version of the fireman's switch can switch off 2 or 4 strings and can be extended in almost any modular way! One control box supplies up to 3 switch boxes, each of which can be used to switch off 4 strings. If this is not sufficient, a slave control box is added, which in turn can switch off up to 3x 4 strings. And if that's still not enough, ... You can imagine!
Technische Daten | Steuerbox | Schaltbox |
| Schaltmethode | ||
| Anschlüsse | ||
| Stringanzahl | ||
| Normen | ||
| Gehäuse | ||
| -- Material | ||
| -- IP Klasse (EN60529) | ||
| -- Mechanische Belastbarkeit | ||
| -- Zertifzierung | ||
| -- Montageort | ||
| -- Abmessungen L x B x T (mm) | 6-8 Strings: 400 x 400 x 132 10-16 Strings: 400 x 600 x 132 | |
| -- Gewicht | (abhängig von der Ausstattung) | |
| Spannung | ||
| -- Betriebsspannung | ||
| -- Sicherung | ||
| -- Leistungsdaten | ||
| -- Bemessungsspannung Isolation | ||
| -- Systemspannung max. | ||
| -- Schaltspannung max. bei 15 A | ||
| -- Steuerspannung | ||
| -- Schaltstrom max. pro String | ||
| Überspannungsschutz | ||
| -- Kategorie | ||
| -- Fernmeldekontakt | ||
| -- Integrierter Slave | + Steuerleitungen > 30 Meter | |
| -- Compliance | 111:2012+A1:2014 | |
| Kommunikation | (LAN/Ethernet optional) | |
| Betriebstemperatur | ||
| Luftfeuchtigkeit | ||
| Optionen | ||
Central emergency shutdown for PV systems, customized variants adapted to the respective system
Suitable for fire alarm systems, can be connected to fire alarm control panel
Suitable for all modules/inverters, regardless of manufacturer
Switches back on automatically after a power failure
Safe disconnection of the PV generator even in an emergency
Arc-free switching thanks to modern switching technology
Complete set; modularly expandable and easy to install
Control box can be switched on and off using an external key switch
AC-coupled, can therefore be triggered at any time via the mains supply
Status can be transmitted to the alarm center via a potential-free contact
Customized variants: Big Box with overvoltage protection
We are also happy to customize our QFirefor you, for example as a big box for disconnecting up to 16 PV strings, including overvoltage protection. Just let us know what you need - sometimes "off-the-shelf" solutions just aren't right!
Inquiry form
We will be happy to send you an offer, free of charge and without obligation, of course. Please let us know in advance:
Photovoltaic fireman's switch: Why actually?
The inverter is usually installed centrally in the building near the domestic power distribution. This can be switched off, as can all the electricity in the house. What cannot be switched off is the voltage coming from the modules: up to 1,000 volts of direct current remain in the building. Please note: from 120 V direct current, this is considered life-threatening.
This applies not only to the fire department in the event of a fire, according to their "Recommendation for action on photovoltaics", a minimum distance of up to 5 meters (depending on whether spraying or extinguishing jet) must be maintained from live parts, but also to maintenance and cleaning work, etc. Self-protection takes precedence over external protection.
Therefore, the unanimous wish is for a safe disconnection device for photovoltaic modules in order to be able to completely de-energize the building in the event of a fire, including the DC side.
QFire is a PV generator disconnection device for the automated galvanic isolation of PV strings in accordance with DIN EN 60947-3:2020.
The set consists of a control box and one or more switch box(es).
The QFire control box is installed centrally near the inverter or in another accessible location. The QFire switch boxes are installed near the module at the roof entrance, from where all cables coming from the roof can be switched off safely and without arcing using special high-performance relays. This means that the entire direct current supply can be interrupted from a central point.
The QFire fireman's switch is switched off
- Manually on the control box
- via an external EMERGENCY OFF or key switch
- Coupled via fire alarm control panel
- AC coupled via the power grid in the event of a power failure - if the grid is reconnected, the system automatically goes back into operation
- due to undervoltage caused by cable breakage or severe fluctuations in the AC grid