Photovoltaic DC string box, factory assembled by Eaton: IEC 61439-2 Annex-DD. For inverters with 2 MPP trackers: 2x IN + 2x OUT, integrated devices: PKZ-SOL PV string circuit breaker and PV surge protection device type 2, cable glands for direct connection to the devices, IKA box 1-row with 18 pitch units and transparent window, for indoor installation only. For safe operation, please note the min. and max. permissible ambient air temperature in the technical data sheet