Reliance Controls 30-Amp Power Inlet Box PBN30 — NEMA 3R Weatherproof Steel, Spring-Loaded Cap

The Reliance Controls PBN30 is a weatherproof 30-amp power inlet box that lets you hardwire a portable generator to your home transfer switch safely and without running cords through doors or windows.

Installed on an exterior wall near an operating generator, this NEMA 3R inlet box provides a secure, code-friendly connection point so exhaust and fumes stay outdoors. Built with corrosion-resistant steel and a spring-loaded cap, the PBN30 was engineered for straightforward wiring, generous internal space, and long-term durability for backup power setups up to 7,500 running watts.

How does the PBN30 make generator connections safer?

The PBN30 moves the generator connection off of windows and doors, keeping cords outdoors and preventing exhaust from entering living spaces. Its weatherproof enclosure and spring-loaded inlet cap protect the mating connector from rain, snow and debris when not in use.

• Watertight NEMA 3R cabinet for outdoor protection
• Spring-loaded inlet cap to keep moisture out
• Steel construction with anti-corrosive powder coat

What wiring and mounting options does it offer?

Reliance designed the PBN30 for easy, code-compliant hardwiring to a transfer switch or panel. The faceplate is removable for wiring access, and four combination knockouts let installers run conduit from multiple directions.

• Four combination 1/2" and 3/4" knockouts (sides, bottom and back)
• Generous interior space to simplify rough-in and conductor routing
• Face removable for fast, clean wiring and inspection

Which generators and transfer panels is this inlet compatible with?

The PBN30 is intended for portable generator systems up to about 7,500 running watts and pairs with manual transfer switches, transfer panels or generator-ready load centers. It is a purpose-built accessory for Reliance Controls transfer products but works with any compatible 30-amp inlet application that meets local code.

• Rated for 30-amp generator connections (up to ~7,500 running watts)
• Designed for use with manual transfer switches and load centers
• Suitable for most 30A generator inlet cords and plugs

How durable and low-maintenance is this inlet box?

The PBN30 uses heavy-duty steel and a powder-coat finish to resist rust and wear in outdoor environments. Its simple, serviceable design reduces maintenance and keeps the inlet ready for emergency use year after year.

• Rugged steel cabinet with anti-corrosive paint for long life
• Minimal moving parts—spring cap and removable faceplate
• Built for outdoor exposure without routine special upkeep

Who is this for? The Reliance Controls PBN30 is aimed at homeowners, electricians and contractors who need a durable, code-friendly outdoor inlet for a portable generator setup. It’s ideal when you want a tidy, permanent connection point near the generator to protect occupants from exhaust and to simplify transfer-switch wiring for backup power up to about 7,500 running watts.