{"id":7519,"date":"2026-01-28T17:49:30","date_gmt":"2026-01-28T16:49:30","guid":{"rendered":"https:\/\/q3-energie.de\/pv-connection-technology-products-firefighter-switches-generator-junction-boxes-ac-dc-boxes\/qfire-big-firefighter-switch\/"},"modified":"2026-05-27T10:52:04","modified_gmt":"2026-05-27T08:52:04","slug":"qfire-big-pv-firefighter-safety-switch","status":"publish","type":"page","link":"https:\/\/q3-energie.de\/en\/products\/qfire-big-pv-firefighter-safety-switch\/","title":{"rendered":"QFire BIG Firefighter Switch"},"content":{"rendered":"\n
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QFire BIG PV Firefighter Safety Switch for Large Solar Systems
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Modular and expandable DC shutdown system with galvanic isolation \u2013 designed for large and complex photovoltaic installations.<\/strong><\/h2>\n\n\n\n
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Modular System Architecture \u2192<\/a><\/div>\n\n\n\n
QFire BIG Control Box \u2192<\/a><\/div>\n\n\n\n
QFire BIG Switch Box \u2192<\/a><\/div>\n\n\n\n
Project-Specific Configuration \u2192<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Application Area of the QFire BIG PV Firefighter Safety Switch<\/h2>\n\n\n\n
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The QFire BIG PV firefighter safety switch was developed specifically for large commercial and industrial photovoltaic systems. By providing galvanic isolation of PV strings according to IEC 60947-3, the system enables safe shutdown of the DC cables between the PV generator and the inverter \u2013 for example in case of fire, maintenance or service work.<\/p>\n\n\n\n

With a central Control Box, project-specific DC Switch Boxes, optional cluster technology and external emergency stop integration, QFire BIG can be flexibly integrated into a wide range of photovoltaic system concepts.<\/p>\n\n\n\n

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Large Industrial and Commercial Roofs<\/strong><\/strong><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Multiple Roof Areas<\/strong><\/strong><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Expandable Photovoltaics Projects<\/strong><\/strong><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Multiple Inverters & MPP Trackers<\/strong><\/strong><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Complex System Structures<\/strong><\/strong><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Increased Safety Requirements<\/strong><\/strong><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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The modular system architecture is particularly suitable for complex rooftop structures, multiple generator fields and large PV systems with many strings. Depending on the system size, Switch Boxes for 2 to 24 strings are available \u2013 with system voltages up to 1,500 V DC and up to 20 A per string.<\/p>\n\n\n\n

For large sites, several QFire systems can be controlled centrally via the QFire Cluster Control Box. This enables multiple buildings or separate generator fields to be shut down from one central point.<\/p>\n\n\n\n

Optional components include surge protection, external emergency stop buttons, key switches, status contacts and online monitoring via QFire.LIVE.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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QFire BIG is a PV firefighter safety switch system for large solar installations with multiple generator fields, complex rooftop structures and increased safety requirements.<\/h3>\n<\/div>\n<\/div>\n\n\n\n
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Modular System Architecture for Generator-Side PV Shutdown of the PV Firefighter Safety Switch<\/h2>\n\n\n\n
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QFire BIG enables galvanic isolation of PV strings between the generator field and the inverter. Typical system components include:<\/p>\n\n\n\n

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Separation of control logic [2] and DC switch boxes<\/strong> [1]<\/strong><\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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Expandable with additional switch boxes<\/strong><\/strong><\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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Integration of fire alarm system and\/or external emergency stop buttons [3]<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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Centralised or cluster-based shutdown<\/strong><\/strong><\/strong><\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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The QFire BIG system has a modular structure and consists of a central Control Box, optional Cluster Control Boxes and DC Switch Boxes for up to 24 strings per box.<\/p>\n\n\n\n

The Switch Boxes are built project-specifically and can optionally be equipped with surge protection and fuses.<\/p>\n\n\n\n

Optional components are:<\/strong>

\u25a0 Fire alarm system integration
\u25a0 Integrated surge protection
\u25a0 Integrated fuses in the positive and\/or negative poles
\u25a0 External emergency stop button
\u25a0 Cluster technology for multiple roof areas
\u25a0 Online monitoring
\u25a0 Time delay module for sequential shutdown of large systems<\/p>\n<\/div>\n\n\n\n

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In the event of shutdown, all strings are galvanically isolated so that the cables between the QFire Switch Box and the inverter become de-energised.

This separation of control and switching functions enables flexible adaptation to system size, rooftop structure and safety requirements.<\/strong><\/h3>\n<\/div>\n<\/div>\n\n\n\n
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Galvanic Isolation of DC Strings<\/h2>\n\n\n\n
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In the event of activation, the QFire PV firefighter safety switch galvanically isolates all connected PV strings on both poles according to IEC 60947-3. This reliably disconnects the positive and negative conductors of each string from the inverter \u2013 for maximum safety during fire and emergency situations.<\/p>\n\n\n\n

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Clear distinction from motor switch solutions<\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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Two-pole disconnection of positive and negative conductors<\/strong><\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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Safe interruption of the DC connection<\/strong><\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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DC-side shutdown directly at string level instead of AC-side isolation only<\/strong><\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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Suitable for system voltages up to 1,500 V DC and up to 20 A per string<\/strong><\/strong><\/strong><\/h3>\n<\/div>\n<\/div>\n\n\n\n
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Galvanic isolation completely interrupts the electrical connection between the PV generator and the inverter. After activation, the cables downstream of the QFire Switch Box are de-energised.

This principle significantly reduces DC-related hazards during fire emergencies and helps maximise safety for firefighters, emergency responders and service personnel.

At the same time, galvanic isolation remains effective regardless of the PV system configuration, string length or the number of connected generator fields.<\/p>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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QFire BIG Control Box for Large PV Systems<\/h2>\n\n\n\n
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Central control and coordinated shutdown of PV strings<\/strong><\/p>\n\n\n\n

The QFire Control Box operates with dedicated system logic. This ensures that the shutdown function remains clearly defined and reliably controllable, even in complex system structures with multiple roof areas or long cable routes.<\/em><\/p>\n<\/div>\n<\/div>\n\n\n\n

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Central system logic<\/strong>
Central evaluation of all control signals and coordinated control of the Switch Boxes<\/p><\/div>\n\n\n\n

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Flexible shutdown triggering<\/strong>
Triggering via firefighter emergency button, external emergency stop, fire alarm system or AC-coupled grid failure signal<\/p><\/div>\n\n\n\n

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Clear separation of control and DC switching<\/strong>
No DC load switching inside the Control Box, resulting in a clean system architecture<\/p><\/div>\n\n\n\n

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Status and remote signalling contacts<\/strong>
Feedback of operating and switching states for integration into higher-level systems<\/p><\/div>\n\n\n\n

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Cluster capability for systems with multiple roof areas<\/strong>
Cluster Control Box for large or distributed photovoltaic installations<\/p><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Download Technical Documentation \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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The Control Box is the central control element of the QFire BIG generator shutdown system. It processes all incoming control signals and coordinates the connected Switch Boxes. In the event of activation, the Control Box initiates a defined and safe shutdown of all connected DC strings \u2013 regardless of quantity, distance or system size.

By clearly separating control logic and DC switching function, the electrical structure remains transparent and standards-compliant. The Control Box itself does not switch DC loads but acts as a central logic and interface level. This makes the system particularly suitable for larger and complex photovoltaic systems with multiple generator fields or future expansion requirements.<\/strong><\/h3>\n<\/div>\n<\/div>\n\n\n\n
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QFire BIG PV Firefighter Safety Switch:
Cluster Technology for Large PV Systems<\/h2>\n\n\n\n
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Star-shaped connection of multiple Switch Boxes<\/strong><\/p><\/div>\n\n\n\n

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Simultaneous shutdown of up to 5 roof areas<\/strong><\/p><\/div>\n\n\n\n

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Almost unlimited scalability<\/strong><\/p><\/div>\n<\/div>\n\n\n\n

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Cluster technology enables the central shutdown of multiple generator fields via a common control logic.<\/strong><\/p>\n<\/div>\n\n\n\n

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QFire BIG Cluster Control Box for Central Shutdown of Distributed Generator Fields<\/h2>\n\n\n\n
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Additional higher-level, star-shaped shutdown architecture<\/strong><\/p>\n\n\n\n

For large and complex photovoltaic systems with multiple roof areas or generator fields, the Cluster Control Box expands the QFire BIG system with a higher-level, star-shaped shutdown architecture.<\/em><\/em><\/p>\n<\/div>\n<\/div>\n\n\n\n

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Star-shaped system structure<\/strong><\/strong>
Central connection of multiple Switch Boxes or system sections via a defined cluster topology<\/p><\/div>\n\n\n\n

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Coordinated shutdown of multiple roof areas and generator fields<\/strong><\/strong>
Coordinated shutdown of spatially separated generator fields via one common triggering instance<\/p><\/div>\n\n\n\n

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Long distances possible<\/strong><\/strong>
Reliable shutdown even with long cable routes<\/p><\/div>\n\n\n\n

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Clearly defined shutdown logic even in complex systems<\/strong><\/strong>
Clear assignment of generator fields and shutdown areas for maximum operational safety<\/p><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Download Technical Documents\u2192<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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The Cluster Control Box extends the functionality of the QFire BIG generator shutdown system for installations with multiple roof areas, halls, building sections or widely distributed generator fields. It acts as a higher-level distribution and coordination unit and enables star-shaped connection of multiple Switch Boxes or system segments.

With this cluster architecture, large and spatially complex photovoltaic systems can be shut down reliably and simultaneously. The shutdown logic remains clearly defined \u2013 regardless of the number of connected Switch Boxes or the physical size of the installation. <\/strong>

This makes the QFire BIG PV firefighter safety switch system with Cluster Control Box particularly suitable for industrial buildings, commercial facilities, logistics centres and projects with future expansion requirements.<\/strong><\/h3>\n<\/div>\n<\/div>\n\n\n\n
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Triggering Methods and Interfaces<\/h2>\n\n\n\n
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Shutdown via the central Control Box<\/strong><\/p><\/div>\n\n\n\n

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Connection to fire alarm systems<\/strong><\/p><\/div>\n\n\n\n

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External emergency stop buttons and key switches<\/strong><\/p><\/div>\n\n\n\n

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AC-coupled shutdown in case of grid failure<\/strong><\/p><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Plug + Play Installation<\/h2>\n\n\n\n
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Pre-assembled control connectors<\/strong><\/p><\/div>\n\n\n\n

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Matching mating connectors included in delivery<\/strong><\/p><\/div>\n\n\n\n

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Pre-wired interfaces<\/strong><\/p><\/div>\n\n\n\n

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Reduced wiring and installation effort<\/strong><\/p><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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QFire BIG Switch Box \u2013 Modular DC Shutdown with Galvanic Isolation<\/h2>\n\n\n\n
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For safe shutdown up to 1,500 V DC \/ 20 A per string<\/strong><\/p>\n\n\n\n

The QFire BIG Switch Boxes perform galvanic isolation of the PV strings directly at the generator field. They provide the central DC switching function of the system and ensure safe, standards-compliant isolation of the connected strings in the event of shutdown.<\/em><\/p>\n\n\n\n

Thanks to the modular design, the Switch Boxes can be flexibly adapted to different system structures \u2013 from smaller sub-generators to large photovoltaic systems with multiple roof areas and high string counts.<\/em><\/p>\n<\/div>\n<\/div>\n\n\n\n

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String Count & Modular Design<\/strong><\/strong><\/strong>
\u25a0<\/strong> Standard configurations from 2 to 24 strings per Switch Box
\u25a0<\/strong> Flexible string reduction possible, for example 8 inputs \u2192 4 outputs
\u25a0<\/strong> Expandable by combining multiple Switch Boxes<\/p><\/div>\n\n\n\n

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Galvanic Isolation According to IEC 60947-3<\/strong><\/strong><\/strong>
\u25a0 Galvanic DC isolation of each individual string
\u25a0 Certified according to IEC \/ DIN EN 60947-3
\u25a0 Suitable for VDE-AR-E 2100-712
\u25a0 Safe DC shutdown up to 1,500 V DC \/ 20 A per string<\/p><\/div>\n\n\n\n

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Enclosures & Degree of Protection<\/strong><\/strong><\/strong>
\u25a0 Suitable for protected outdoor installation
\u25a0 2\u201316 strings: polycarbonate enclosure, grey or transparent cover, IP66 \/ IP67, IK08\u2013IK10
\u25a0 18\u201324 strings: robust sheet steel enclosure, IP66, IK10<\/p><\/div>\n\n\n\n

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Connectors and Connection Options<\/strong><\/strong><\/strong>
\u25a0 Standard: MC4-Evo2 by St\u00e4ubli
\u25a0 Alternatives: Sunclix, Amphenol or terminal connection technology<\/p><\/div>\n\n\n\n

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Surge Protection & PV Fuses<\/strong><\/strong><\/strong><\/strong>
\u25a0 Optional integrated Q3 DC surge protection T1+T2 up to 1,500 V DC
\u25a0 Other surge protection manufacturers available on request
\u25a0 Optional PV fuses in the positive and\/or negative pole<\/p><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Each Switch Box performs galvanic isolation of the connected PV strings directly at the installation point.<\/h3>\n<\/div>\n<\/div>\n\n\n\n
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QFire BIG PV Firefighter Safety Switch: Project-Specific Instead of Off-the-Shelf<\/h2>\n\n\n\n

QFire BIG Switch Boxes are designed, planned and manufactured project-specifically. String count, connection technology, protection components, enclosure sizes and interfaces are individually adapted to the respective system structure.

The result is not an off-the-shelf standard product, but a technically clean, standards-compliant and future-proof shutdown solution \u2013 Made in Germany.<\/p>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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String Count<\/h3>\n\n\n\n

\u25a0<\/strong> Switch boxes from 2 to 24 PV strings
\u25a0<\/strong> Flexible string reductions between input and output<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n

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Connectors and Connection Options<\/h3>\n\n\n\n

\u25a0<\/strong> Standard: MC4-Evo2 by St\u00e4ubli
\u25a0<\/strong> Alternatives such as H4, Sunclix or terminal connection technology possible<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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DC Surge Protection<\/h3>\n\n\n\n

\u25a0<\/strong> Optional integrated surge protection
\u25a0<\/strong> Standard: Q3 surge protection T1+2 up to 1,500 VDC
\u25a0<\/strong> Alternative surge protection manufacturers available on request<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n

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PV Fuses<\/h3>\n\n\n\n

\u25a0<\/strong> Optional integrated PV fuses
\u25a0<\/strong> Available in the positive and\/or negative pole<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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Project Inquiry for QFire BIG PV Firefighter Safety Switches<\/h2>\n\n\n\n
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Would you like to configure the QFire BIG system for a specific project, have technical details reviewed or select the right system configuration for your photovoltaic installation?<\/strong>


Using the following inquiry form, we collect all relevant project data in a structured and traceable way.<\/p>\n<\/div>\n\n\n\n

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You can also submit wiring diagrams, string plans or other technical documents directly with your inquiry. Based on this information, we review the technical requirements, configure the QFire BIG system for your project and coordinate the required components.<\/p>\n\n\n\n

If we need additional information, we will contact you. Otherwise, you will receive a project-specific quotation.<\/p>\n\n\n\n

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Start Project Inquiry \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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PV Firefighter Safety Switch Project Inquiry<\/h2>\n\n\n
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Project-specific inquiry for configuring the QFire system, selecting the right components and preparing a quotation.<\/p>\n\n\n\n

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Start QFire Firefighter Switch Project Inquiry \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Technical Documents for PV Firefighter Safety Switches<\/h2>\n\n\n
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Datasheets, certificates and technical documentation for QFire BIG and LITE, Control Boxes, Switch Boxes and accessories.<\/p>\n\n\n\n

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Technical Documentation for Firefighter Switch \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Functionality + Technology QFire PV Firefighter Safety Switch<\/h2>\n\n\n
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Technical fundamentals of DC-side disconnection, system design, triggering methods and galvanic isolation.<\/p>\n\n\n\n

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Functionality + Technology Firefighter Switch \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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FAQ on PV Firefighter Safety Switch<\/h2>\n\n\n
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Answers to frequently asked questions about application, standards, triggering concepts, mandatory requirements, and operation of firefighter switches.<\/p>\n\n\n\n

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FAQ on Firefighter Switches \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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Technical Articles and Industry News About PV Firefighter Safety Switches<\/h2>\n\n\n\n

The use of firefighter safety switches in photovoltaic systems is widely discussed within the solar industry \u2014 particularly regarding safety, standards and emergency response concepts.
Here you will find selected technical articles, industry news and technical background information related to PV firefighter safety switches. <\/p>\n\n\n\n

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When Is a Firefighter Safety Switch Required for Photovoltaic Systems?<\/h3>\n\u2192<\/span>\n<\/a>\n\n\n\n

Generator-Side Shutdown Using a Firefighter Safety Switch<\/h3>\n\u2192<\/span>\n<\/a>\n\n\n\n

Q3 QFire PV Firefighter Safety Switch Receives IEC 60947-3 Certification <\/h3>\n\u2192<\/span>\n<\/a>\n\n\n\n

QFire PV Firefighter Safety Switch Training: Practical Training for Planners and Installers<\/h3>\n\u2192<\/span>\n<\/a>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Application Area of the QFire BIG PV Firefighter Safety Switch The QFire BIG PV firefighter safety switch was developed specifically for large commercial and industrial photovoltaic systems. By providing galvanic isolation of PV strings according to IEC 60947-3, the system enables safe shutdown of the DC cables between the PV generator and the inverter \u2013… <\/p>\n","protected":false},"author":1,"featured_media":0,"parent":7284,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"class_list":["post-7519","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/7519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/comments?post=7519"}],"version-history":[{"count":0,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/7519\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/7284"}],"wp:attachment":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/media?parent=7519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}