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Home » NEWEST Products » New by Manufacturer » Amphenol » Amphenol Helios H4 Solar Connectors
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Amphenol Industrial Helios H4 Solar Connectors

Cost-Effective Solutions for All Segments of the Solar Electric System

Photon International: The Solar Power Magazine gives Helios H4 Top Ranking for 2 years in a row!


Amphenol Industrial Helios H4 Solar Connectors offer cost-effective solutions for all segments of the solar electric system while featuring a 52A rating, which is currently the highest current rating in the industry. The Helios H4 provides efficient, low loss power transfer through precision machined contacts utilizing RADSOK® technology. The H4 connectors offer high reliability for both thin film and crystalline silicon technologies. The H4 Solar Connectors feature a quick and easy, safe NEC 2008 compliant locking system with secure snap lock mating, making the H4 the most advanced solar connector available. The Helios H4 meets NEC 2008 standards "as is", with no additional components required. With a 25-year UV and ozone resistance, the Amphenol H4 Solar Connectors meet waterproof IP67 standards and withstand hydrolysis, oil, chemicals, abrasion, corrosion, and temperature extremes. The Amphenol Industrial Helios H4 Solar Connectors are fully intermateable with industry standard (MC4) connectors and are ready for field assembly with no small parts to lose. The RoHS compliant Helios H4 connectors are engineered to meet UL, TUV, IEC/CEI, NEC, and DIN V.

The Helios H4 Panel Connector offers higher current ratings and lower contact resistance resulting in lower power losses. Compatible with standard industry connectors, the Helios H4 Panel Connector is available in three different gauges including 14 AWG rated at 36A, 12 AWG rated at 45A, and 10 AWG rated at 52A.

NEW! Amphenol Industrial Helios H4 Solar Connectors have been expanded to offer the 1st field-installable PV connectors that accept 8 gauge wire, TUV-certified to 1500V, UL approved for use up to 1000V, and meet the requirements of IEC EN 50521 Certificate #: R-72123201. Amphenol's Helios H4 Solar Connector stamped and formed contact option features a wide back cap to accommodate bigger wire for the 1000V rating. This option is ideal for use in large scale PV installations as well as 1000V PV modules. View the 1500V TUV-certified parts.


  • UL and TUV dual approval
  • Fully intermateable with industry standard
  • Meets all new NEC 2008 requirements
  • Quick and easy secure snap-lock mating
  • Simple unlocking tool meets NEC requirements
  • Long-term UV and Ozone resistance
  • Withstands hydrolysis, oil, chemicals, abrasion, corrosion, and extreme temperatures
  • Highest current rating in industry
  • RoHS compliant
  • Complete Cable Assemblies available
  • Low contact resistance means low power loss
  • Ready for field assembly
  • No assembly required, no small parts to lose
Technical Data
Rated Current
36A (2.5mm², AWG14),
45A (4.0mm², AWG12),
52A (6.0mm², AWG10)
65A (10.0mm, AWG8)
Rated voltage 1500V (IEC/CEI), 600V(UL)
Test voltage 6kV for 1 minute, 10kV impulse
Typical contact resistance 0.25mΩ
Contact material Copper, tin plated
Contact system Machined/cold formed contact
with Radsok® insert
Insulation material PC
Locking mechanism Snap-lock, special unlock tool required to un-mate as required by NEC2008
Cable strain relief Compression gland with ratcheting gland nut
Degree of protection IP68 (1 meter, 1 hour) mated
Safety class II (IEC61140)
Pollution degree 2 (IEC60664)
Overvoltage category III (IEC60664)
Flame class UL94-V0
Ambient temperature range -40ºC - +90ºC

Helios H4 Connector Assembly Video

Amphenol Industrial Helios H4 Solar Connectors

Additional Resources
Solar Connectors Datasheet Solar Connectors Datasheet 
Datasheet Panel Connector Datasheet 
Press Release Press Release: TUV Certified to 1500V 
Solar Presentation Solar Presentation 
Helios Solar Brochure Helios Solar Brochure
Amphenol Industrial RADSOK Contact


Amphenol Industrial HelioFuse provides a quick replaceable solution for installing in-line solar fuses. The in-line fuse provides the needed electrical protection to prevent damage to the solar array and features a weather tight housing. HelioFuse is available in two configurations; a connector version which plugs right into an industry standard solar connector (Helios H4 Connector) and a wire overmold version for custom harnesses.

  • Rugged, low cost solution
  • Patent-pending design
  • Fully intermateable with industry standard connectors
  • 1A to 20A current rating
  • 600V and 1000V versions
  • 10,000A withstand rating
  • IP68 protection degree
  • Meets UL 94 V-0 flammability rating
  • UL approved


Amphenol Industrial Helios HelioLug is a grounding component for solar modules and racking systems that provides easy termination to the ground wire. Offered as the only UL 2703 certified PV grounding component for use with a ground wire, HelioLug can help eliminate potential code compliance issues. HelioLug is designed for use with virtually all module frames and racks with dimensions (0.09 inches (2 mm) to 0.25' (6.35 mm) thick, is compatible with all module grounding holes (0.16" (4mm) to 0.295" (7.5mm), and accepts 4-12 AWG solid copper conductors. Compliant with all new NEC 2008 requirements, HelioLug is offered with all the certified reusable hardware needed for making rapid, secure connections to PV modules and racks.

  • The only UL 2703 certified grounding lug available
  • Meets all new NEC 2008 requirements
  • For use with virtually all module frames and racks, (0.09 inches (2 mm) to 0.25' (6.35 mm) thick)
  • Capable of accepting 4-12 AWG solid copper conductors
  • Code compliant "first make - last break" grounding system
  • Compatible with all module grounding holes, (0.16" (4mm) to 0.295" (7.5mm))
  • Certified reusable hardware for servicing without replacement


The following accessories are available for use with the Amphenol Industrial Helios H4 Solar Connector System.

Crimp Tool H4 Crimp Tool


Strip Tool H4 Strip Tool


Wrench Tool


H4 Wrench
Ring Tool


H4 Ring Tool

Solar CablesAmphenol Industrial Helios H4 Solar Cables



Solar Junction Boxes





Unlocking Tool


Dust CapsAmphenol Industrial Helios H4 Dust Caps



Tool Kit
  • Amphenol
  • Alternate Energy
  • Connectors|Photovoltaic|Energy