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The EZ Solar JB‑3 is a universal, outdoor‑rated PV junction box engineered for fast, secure mounting on any solar rail or module frame . With self‑leveling stainless steel clamps and a durable polycarbonate enclosure, the JB‑3 delivers a clean, watertight wiring solution for residential and commercial rooftop solar installations.
Key FeaturesUniversal mounting — attaches to any rail (square or round) or module frame using stainless steel clamps
Self‑leveling design for quick, accurate installation
Weatherproof enclosure — NEMA 3R rated for outdoor use
Leak‑proof construction for long‑term reliability
Fast installation with EZ Solar's simplified mounting system
Made in the USA (per EZ Solar product line)
Part Number: JB‑3
Material: UV‑resistant polycarbonate enclosure + stainless steel clamps
Interior Volume: 109 in³ (per detailed spec listings)
Certifications: UL 1741 & CSA C22.2 No. 290 (per distributor spec)
Electrical Rating: Up to 1,000 VDC, 80A continuous (per distributor spec)
Cable Entry: Multiple entry points on three sides
Mounting: Rail‑mount or panel‑mount
Weather Rating: NEMA 3R outdoor rated
JB‑3 junction box
Universal stainless steel mounting clamps
DIN rail and neutral bus (per distributor spec)
Rooftop PV wiring transitions
Rail‑mounted or module‑mounted junction points
Residential and commercial solar installations
Systems requiring a compact, clean, leak‑proof junction box