JT3 PV Junction Box

JT3 PV Junction Box

JT3 is a photovoltaic junction box designed to provide an electrical connection point within solar PV module assemblies. It connects the module’s internal conductors to the external PV circuit while providing protection for the electrical connection in outdoor operating environments.

The JT3 uses tin-plated copper contacts and PPO insulation material, with a specified contact resistance of less than 5mΩ. It is rated for 5A and is designed for conductor sizes of 2.5 / 4.0 mm² (14 / 12 AWG).

The junction box provides IP65 protection and is specified for an ambient temperature range of -40°C to +85°C. Its outer housing is designed to resist UV exposure and aging for outdoor photovoltaic applications.

Key Features

• Designed for photovoltaic module applications
• 5A rated current
• IP65 protection
• Tin-plated copper contacts
• PPO insulation material
• Contact resistance <5mΩ
• Supports 2.5 / 4.0 mm² conductors
• Compatible conductor gauges: 14 / 12 AWG
• Operating temperature: -40°C to +85°C
• UV-resistant and aging-resistant outer housing
• UL94-V0 flame classification
• Safety Class II

Low-Resistance Electrical Connection

JT3 uses tin-plated copper contacts with a specified contact resistance of less than 5mΩ, helping maintain a low-resistance electrical connection within the PV module circuit.

What Is a PV Junction Box?

A PV junction box is an electrical enclosure used on a photovoltaic module to provide a protected connection between the module’s internal conductors and external PV wiring.

The junction box helps protect the electrical connection from environmental exposure and provides a defined interface between the solar module and the external circuit.

Depending on the module design, a PV junction box may also incorporate additional electrical components such as bypass diodes. The exact configuration depends on the module and junction box design.

PV Junction Box for Solar Panels

JT3 is designed for integration into photovoltaic modules and solar panels where a compact electrical junction is required.

The combination of PPO insulation, tin-plated copper contacts, IP65 protection and UV-resistant housing makes the junction box suitable for outdoor PV module applications within its specified electrical and environmental ratings.

Outdoor Protection

JT3 provides IP65 protection and is designed for an ambient temperature range of -40°C to +85°C.

The outer housing is designed to resist UV exposure and aging, helping the junction box withstand the environmental conditions encountered in outdoor photovoltaic installations.

Conductor Compatibility

JT3 supports conductor cross sections of 2.5 / 4.0 mm², corresponding to 14 / 12 AWG cable sizes.

The conductor size should be selected according to the PV module design and the electrical requirements of the complete system.

Technical Data

High-Voltage PV Application

JT3 is rated at 1500V according to TÜV specifications and 1000V according to UL specifications, subject to the applicable certification and product configuration.

The voltage rating of the junction box should be considered together with the electrical ratings of the PV module, conductors and other components used in the complete circuit.

Applications

Solar PV Modules

Designed for integration into photovoltaic modules and solar panels.

Residential PV

Suitable for residential solar PV module applications within the specified electrical and environmental ratings.

Commercial & Industrial PV

Suitable for commercial and industrial photovoltaic module applications.

Distributed PV

Suitable for distributed photovoltaic systems using compatible PV modules.

Utility-Scale PV

Suitable for large-scale photovoltaic module applications when the product specifications meet the project requirements.