Reliance Controls PB50 50-Amp NEMA 3R Outdoor Power Inlet Box

Outdoor power inlet for safe, cord-free generator setup

The Reliance Controls PB50 50-Amp NEMA 3R Power Inlet Box is built for outdoor use, providing a secure connection point for your backup power system. Instead of routing cords through doors or windows, you can hardwire the inlet directly to your transfer switch or panel, creating a neat, weatherproof interface outside your living spaces.

With a rugged steel body, anti-corrosive powder coating, and a rain-tight NEMA 3R enclosure, this inlet box helps protect connections from the elements. A spring-loaded front cap seals the connector when not in use, while a removable face makes wiring and placement easier for professionals and DIYers alike.

Key specifications include a maximum generator running wattage of 12,500 and a maximum input of 50A at 125/250VAC. The design accepts 8 AWG 75°C insulated wire and features four combination knockouts (1/2 inch and 3/4 inch) on each side, bottom, and back, enabling flexible routing and rough-in.

Why it matters in real life aligns with everyday needs: you gain a dedicated outdoors inlet that reduces cord clutter, supports safer generator operation, and keeps the generator setup accessible without compromising indoor comfort. The removable face and moisture-sealing cap contribute to straightforward maintenance and long-term reliability.

Highlights at a glance

• Outdoor-ready power inlet that works with Reliance Controls transfer switches and panels
• Rain-tight NEMA 3R steel enclosure with rust resistance
• Flexible wiring with four knockouts and generous interior space
• Removable face for quick placement and wiring access
• Rated for 50A at 125/250VAC, up to 12,500 watts; backed by a 5-year warranty

For installation, align the unit with your outdoor wall and route wires via the knockouts to your transfer switch or load center. The cUL 1008 listing adds a level of confidence for electricians and homeowners alike. Since 1909, Reliance Controls has delivered reliable electrical solutions and continues to support robust, safe power delivery with a focus on user-friendly design.

Why choose PB50

• Weatherproof protection and durable steel construction
• Easy wiring access thanks to a removable face
• Quiet, moisture-resistant operation with a cap when not in use
• Compatibility with a wide range of Reliance Controls transfer devices