Generac 50-Amp 125/250V Raintight Power Inlet Box — 50A NEMA CS6365, NEMA 3R Weather-Resistant Resin

The Generac 6338 is a NEMA 3R-rated, 50-amp 125/250V rain-tight power inlet box that lets you safely plug an outdoor generator into a home transfer switch.

Designed for outdoor installation and hardwired to your transfer switch, this compact inlet box creates a secure, weather-resistant access point for temporary generator power. Built from non-metallic resin, the unit resists moisture and corrosion while providing multiple knockout options for flexible wiring. It supports generators up to 12,500 watts and mates with common Generac 50-amp models and compatible transfer switches.

How does this inlet box make connecting a portable generator easier?

Instead of running extension cords through doors or windows, the Generac 6338 provides a dedicated exterior inlet that connects to your home transfer switch. This streamlines hookup, reduces tripping hazards, and keeps generator power isolated from utility lines. The inlet’s lid and NEMA 3R rating help protect the connection during wet weather.

• Direct hardwired connection to transfer switch — no through-the-door cords
• Lockable or closed inlet cover helps keep contacts dry and secure
• Compatible with 50-amp generator cords to simplify setup

Will this fit my Generac generator and transfer switch?

The 6338 is built for generators with 50-amp 125/250V outlets and is compatible with specific Generac models such as GP15000E, GP17500E, XG10000E, and XP10000E. It also pairs with Generac transfer switches like models 6380, 6381, and 6335. Always confirm plug configuration (NEMA CS6365) and amperage before purchase.

• Rated for up to 12,500 watts maximum generator output
• Designed to accept NEMA CS6365 50A 125/250V plugs
• Works with several Generac generator and transfer switch models

What weather protection and durability does the box offer?

Constructed from non-metallic resin with a NEMA 3R rating, the inlet box sheds rain and resists rust—ideal for outdoor exposure near service entrances or on exterior walls. Six wiring knockouts give electricians placement flexibility while keeping installations neat and code-compliant. The lid seals the inlet when not in use, reducing moisture and debris entry.

• NEMA 3R-rated housing for rain and external weather protection
• Non-metallic resin body means corrosion resistance and long life
• Six knockouts provide flexible conduit and cable routing

Who should choose the Generac 6338? This inlet box is intended for homeowners, contractors, and facility managers who want a safe, code-friendly way to connect a portable generator to a residence or building transfer switch. It’s a practical choice when you need a durable outdoor inlet for occasional outage use, especially if you own a compatible 50-amp Generac generator or plan to hook up with professional wiring. Have a licensed electrician install and hardwire the box to ensure compliance with local codes and the transfer switch manufacturer’s instructions.