The MATPH surge protector impresses with the high working current capacity of 20 kA and is available in 750 Vdc or 1000 Vdc versions. The line is automatically disconnected from the power lines by the built-in thermal switch, the LED lamp turns off and the relay contact reports the fault status. So you have the error message also in the control cabinet. All this without additional power supply! In addition, the ground resistance of the photovoltaic system can be measured due to the spark gap between the line and ground without having to remove the device.