Hubbell HBL503SS Round 50A 125V Stainless Steel Shore Power Inlet - Premium Marine Power Connection
Premium stainless steel 50-amp marine shore power inlet combining traditional styling with modern performance for discerning boat owners. The Hubbell HBL503SS features a robust stainless steel construction with gasketed self-closing cover that provides watertight protection when securely fastened, delivering reliable high-capacity power connections for luxury yachts and performance boats.
This professional-grade inlet offers the classic appeal of stainless steel hardware while meeting demanding IP56 weatherproof standards. The self-closing cover automatically shields interior components from marine elements, ensuring long-term electrical reliability and maintaining the aesthetic appeal that stainless steel provides.
Key Features & Premium Benefits
- High-Capacity 50-Amp Rating: Supports large boats and yachts with demanding electrical systems and multiple high-power appliances
- Premium Stainless Steel Construction: Traditional marine-grade stainless steel provides superior corrosion resistance and timeless aesthetic appeal
- Self-Closing Gasketed Cover: Automatic closure protects interior components while maintaining watertight integrity
- Watertight Performance: IP56-rated protection ensures reliable operation in harsh marine weather conditions
- Standard Installation Pattern: 2-3/8" mounting centers match existing marine electrical installation standards
- Complete Hardware Package: Includes mounting screws and gasket for professional installation
- Precision Engineering: 2.171" rear diameter provides secure deck penetration and mounting
Technical Specifications
Stainless Steel Marine Construction
The HBL503SS represents the pinnacle of marine electrical hardware, featuring traditional stainless steel construction that provides both functional excellence and timeless aesthetic appeal. The marine-grade stainless steel resists corrosion, maintains its appearance over years of exposure, and complements other stainless steel hardware on premium vessels.
Premium Construction Features:
- Marine-Grade Stainless Steel: Superior corrosion resistance in saltwater environments
- Self-Closing Mechanism: Automatically protects interior from weather and spray
- Precision Gasketing: Ensures watertight seal when cover is properly secured
- Polished Finish: Maintains aesthetic appeal and resists weathering
- Robust Hardware: Heavy-duty construction withstands marine service conditions
Installation & Premium Applications
Designed for permanent installation on premium vessels where both performance and appearance matter, this inlet provides reliable 50-amp shore power while maintaining the classic stainless steel aesthetic preferred by discerning boat owners and yacht builders.
Premium Vessel Applications:
- Luxury motor yachts and sportfishing boats
- High-end sailboats with comprehensive electrical systems
- Classic boats requiring traditional stainless steel hardware
- Charter yachts and commercial vessels with appearance standards
- Sportfishing boats with tournament-level electrical demands
- Restoration projects requiring period-correct stainless hardware
Advanced Weather Protection
The self-closing gasketed cover provides automatic protection against marine weather conditions. When properly fastened, the inlet achieves watertight performance with IP56 rating, protecting internal electrical components from water ingress while maintaining reliable power connectivity.
Weather Protection System:
- Automatic Closure: Self-closing cover protects when connection is removed
- Watertight Seal: Gasket system prevents water ingress when secured
- IP56 Rating: Professional-grade protection against water jets and spray
- Corrosion Immunity: Stainless steel construction eliminates rust concerns
- Long-Term Reliability: Maintains seal integrity over years of marine service
Professional Installation
The standard 2-3/8" mounting pattern ensures compatibility with existing marine electrical installations, while the included hardware package provides everything needed for professional installation. The 2.171" rear diameter accommodates standard deck penetrations and mounting configurations.
Installation Requirements:
- Marine-grade 50-amp wiring and appropriate circuit protection
- Proper deck or hull penetration sealing for watertight integrity
- ABYC-compliant installation practices and grounding
- Access to interior wiring area during installation
- Professional marine electrician installation recommended
Frequently Asked Questions
What makes this inlet different from non-metallic versions?
How does the self-closing cover work?
Is this inlet suitable for saltwater marine use?
What size boats typically use 50-amp shore power inlets?
Does this inlet require special shore power cords?
Experience premium marine electrical performance with Hubbell's traditional stainless steel construction. The HBL503SS inlet combines classic marine hardware aesthetics with modern electrical performance, delivering the reliability and appearance that premium vessel owners demand.



