DC String Combiner Panels

QT Corporation (QT) is an innovative leader in custom engineered electrical panels.  With over twenty years of experience in the design and supply of high volume assemblies in the electrical equipment  and switchgear industry, QT's talented team of engineers and technicians bring a lot of experience to the table.  This experience and innovation translates into a competitive and  feature rich line of string combiners, re-combiners and DC disconnects.

Product Offering

  • String combiner boxes – located between the solar module and the inverter, these boxes take in multiple input circuits and provide a single output.

  • Recombiner boxes – located between string combiners and the inverter for large commercial or utility projects.  These boxes provide a high amperage DC disconnect just before entrance into a large inverter.

  • Disconnect enclosures & fuse boxes – offers PV installers a selection of fused and disconnect options.

  • INPUT:                        6 / 12 / 24 / 36 STRING

  • VDC RATING:             600 / 1000 / 1500

  • OUTPUT AMPS:         100 / 200 / 400 / 600 AMP

  • DISCONNECT:            Available as integrated or without

  • UL-1741 Certified:        Pending

  • ENCLOSURE STYLE: NEMA 3R, NEMA 4, NEMA 4X 

Located between the solar module and the inverter, these boxes take in multiple input circuits and provide a single output.   The boxes are available in a range of input circuits and amp ratings with or without a load break disconnect, and a variety of environmental ratings.  The boxes are 3rd party certified to UL-1741.

Disconnect String Combiner Boxes

24 Circuit, 400A, Disconnect Combiner, NEMA 3R - Exterior

24 Circuit, 400A, Disconnect Combiner, NEMA 3R - Interior

Contactor Style Combiner Boxes

Combiner boxes provided with an integral DC load break contactor, rated up to 1500VDC.  These units allow for operator initiated remote or automatic disconnect of the DC power output.  The boxes are available in a range of input circuits and amp ratings with and a variety of environmental ratings.  The boxes are 3rd party certified to UL-1741.  

  • INPUT:                           6 / 12 / 24 / 36 STRING

  • VDC RATING:                600 / 1000 / 1500

  • OUTPUT AMPS:            175 / 250 / 250 AMP

  • DISCONNECT:              Contactor Style, DC Load Break

  • DISCONNECT TYPE:    Local Switch & Remote Electrical

  • UL-1741 Certified:          Pending

  • ENCLOSURE STYLE:    NEMA 3R, NEMA 4, NEMA 4X

  • OPTIONAL:                    Arc Fault Circuit Interruption (AFCI) 

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