Collection: PV Combiner Boxes and String Fuses

These are used to allow the parallel connection of several strings of PV modules or to enable large or armoured cables to be connected from the PV array to charge controller or inverter location so minimising voltage & power losses. Since the PV array cannot be switched off these junction boxes must be labelled as 'PV Array Junction Box - Danger, contains live parts during daylight'.
These boxes can also contain string fuses which provide a means to isolate the PV strings. String fuses must be provided for all arrays formed of N parallel strings, where (N-1) x Isc (module short circuit current) is greater than the module maximum series fuse rating. String fuses are required in both positive and negative legs of the string cabling.
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5 products

  • PV Combiner Boxes

    PV Combiner Boxes

    2 models available
    From £113.10

    IP66 rated enclosures with standard DIN rail for mounting fuseholders or terminals. Supplied complete with cable glands.

  • PV String Fuse Holders

    PV String Fuse Holders


    Helio DIN rail mounting fuse holders specifically designed for PV & DC applications. Rated at 1000V, 32A DC. Terminals accept up to 10 sq mm flexible cable, or 16 sq mm rigid wire. Pull out carrier to enable easy replacement of fuses.

  • PV String Fuses Type gPV

    PV String Fuses Type gPV

    7 models available
    From £5.50

    These fuses are specifically designed to protect PV modules from reverse currents. Allows for safe circuit interruption under typical low fault conditions produced by PV arrays.

  • PV String Fuse Holder Accessories

    PV String Fuse Holder Accessories

    2 models available
    From £2.02

    Jumper Bar allows parallel connection of string fuse holders. Can be cut to length for use with up to 13 fuseholders.

  • PV Combiner Box Terminal Blocks

    PV Combiner Box Terminal Blocks

    4 models available
    From £0.85

    Terminal blocks for use with PV combiner boxes. Mount to standard DIN rail.

*see manufacturer's documentation for further information