JT3-abcd PV Junction Box
PV Junction BoxJT3-abcd is a 1500 V PV junction box designed for photovoltaic modules and solar panel applications....
View DetailsPV Junction Boxes for Solar Panels
Last updated: October 2026
Photovoltaic junction boxes that house electrical connections between solar cells and external cables, integrating bypass diodes for panel-level protection.
A PV junction box is the enclosure bonded to the back of a module. It collects the cell-string ribbon tails, houses the bypass diodes that protect cells against partial shading, and presents the sealed DC output leads that leave the panel. IEC 62790 is the safety standard covering its construction and tests.
The range splits by how the module is wired. JT3 and JB2 are the soldered-ribbon types for conventional modules, rated 5 A with IP65 enclosures and PPO bodies; JT3-abcd is the higher-current potted type at 32 A with IP68 protection, used where the module runs more current through fewer ribbon points. All three use tin-plated copper contacts and hold contact resistance below 0.5 mΩ.
Showing 3 products in this category
JT3 PV Junction Box
PV Junction BoxJT3 is a PV junction box designed for photovoltaic module applications, with a 5 A rated current, IP...
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JB2 PV Junction Box
PV Junction BoxJB2 is a 1000 V PV junction box designed for solar photovoltaic modules, featuring a double fixed co...
View DetailsSpecification comparison
| Model | Rated voltage | Rated current | Protection | Contact resistance | Conductor size |
|---|---|---|---|---|---|
| JT3-abcd PV Junction Box | 1500 V (TUV) | 32 A | IP 68 | <0.5 mΩ | — |
| JT3 PV Junction Box | 1500 V (TUV) 1000 V (UL) | 5 A | IP 65 | <0.5 mΩ | 14 / 12 AWG 2.5/4.0 mm² |
| JB2 PV Junction Box | 1000 V (TUV) 600 V (UL) | 5 A | IP 65 | <0.5 mΩ | 16 / 14/12AWG 1.5/2.5/4.0mm² |
Values are the mated-pair ratings from our published datasheets. Where a field is blank, that variant does not specify it — ask us and we will confirm against the drawing for your configuration.
Frequently asked questions
How do I choose between a 5 A and a 32 A junction box?
Match the box current rating to the module string current it carries, with margin. JT3 and JB2 at 5 A suit conventional ribbon-soldered modules where each diode leg carries a fraction of the module current; JT3-abcd at 32 A is for architectures that concentrate current through the box, such as half-cell and shingled layouts with fewer, higher-current paths.
What does the IP rating mean on a junction box?
IP65 means the enclosure is dust-tight and protected against water jets; IP68 means it withstands continuous immersion at the rated depth. For rooftop and ground-mount arrays, IP65 covers normal rainfall and wash-down. IP68 matters where panels sit in standing water, heavy snowmelt, or are cleaned aggressively.
Is the bypass diode included?
Diode configuration is specified per module layout, because the number and placement of bypass diodes has to match how the cell strings are grouped. Confirm the diode count and current rating against your module datasheet when ordering, and ask us if you are changing cell layout.