Rooftop photovoltaic systems require a disconnection device near the PV modules that is connected to the power supply in the house. This allows the fire brigade to carry out extinguishing work in an emergency without being unnecessarily endangered. The new PV Next Fireman Switch combines strings extremely space-saving and can reliably disconnect them in the event of a fire. The current flow from the photovoltaic modules is interrupted as soon as the power supply inside or outside the house is switched off. This enables the fire brigade to work safely and fires can be extinguished more quickly. In contrast to other solutions, electricity is only consumed during the switching process.