PV Combiner Boxes & String Fuses

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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.

PV Combiner Boxes

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

4 String Combiner Box 8 String Combiner Box
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Product Code Description Retail Price
(ex VAT)
PV-CB4/1 PV IP66 Combiner Box 4 strings 182 X 180 X 111 (empty) £80.22
PV-CB8/1 PV IP66 Combiner Box 8 strings 254 X 180 X 111mm (empty) £76.62

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.

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Product Code Description Retail Price
(ex VAT)
FH-HELIO Helio PV String Fuse holder - 1000VDC £3.92

PV String Fuses Type gPV

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.

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Product Code Description Retail Price
(ex VAT)
F-ATM3 3A 600VDC gPV fuse (fits Helio fuse holder) £3.20
F-ATM5 5A 600VDC gPV fuse (fits Helio fuse holder) £3.60
F-ATM8 8A 600VDC gPV fuse (fits Helio fuse holder) £3.20
F-ATM10 10A 600VDC - Discontinued use F-ATM10(1000) £3.20
F-ATM10(1000V) 10A 1000VDC gPV fuse (fits Helio fuse holder) £3.36
F-ATM12(1000V) 12A 1000VDC gPV fuse (fits Helio fuse holder) £3.36
F-ATM15 15A 600VDC gPV fuse (fits Helio fuse holder) £3.20
F-ATM15(1000V) 15A 1000VDC gPV fuse (fits Helio fuse holder) £3.36
F-ATM-20(1000V) 20A 1000VDC gPV fuse (fits Helio fuse holder) £3.36
F-ATM25(1000V) 25A 1000VDC gPV fuse (fits Helio fuse holder) £3.49
F-ATM30 30A 1000VDC gPV fuse (fits Helio fuse holder) £3.49

PV String Fuse Holder Accessories

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

Feeder Terminal allows connection of up to 16 sq mm cable to the Jumper Bar.

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Product Code Description Retail Price
(ex VAT)
F-JUMPER Jumper Bar for Helio fuse holder (13 way) with end caps £4.14
F-FEEDER Feeder Terminal use with Helio fuse holder jumper bar (90A) £1.18

PV Combiner Box Terminal Blocks

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

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Product Code Description Retail Price
(ex VAT)
PV-CB/TB6 Terminal Block 6mm £9.95
PV-CB/TB8 Terminal Block 8mm £11.25
PV-CB/TB-COVER6 Terminal Block Cover/Partition/End for term block 6mm £3.62
PV-CB/TB-COVER8 Terminal Block Cover/Partition/End for term block 8mm £3.29