Best 15 Amp Generator Transfer Switches (2026)

The Kohree is a pre-wired inlet box: a weather-resistant enclosure with a 5-15P inlet and a circuit breaker already connected, pre-drilled so you can mount it on a wall and feed one dedicated circuit. A green lamp on the lid tells you the generator side is live, which is a small feature that saves a lot of guessing during an outage at night.

The tradeoff is scope. At 15 amps and 125 volts you have roughly 1,800 watts at the inlet, enough for a gas furnace blower, a refrigerator or a sump pump, but not two of them together. Next to the 4 circuit Nature's Generator switch in this lineup, the Kohree gives up circuit count in return for a simpler install that is closer to a one-circuit rewire than a panel project.

Ownership is mostly about the inlet. Keep the lid shut and the cord unplugged between outages so moisture does not creep into the receptacle, and check that the generator cord is a proper 14 or 12 gauge for the run length. Wire gauge, breaker size and local code still apply, so plan a licensed electrician for the hookup in places that require a permit.

The RVMATE is the lowest tier on price in this group and still carries a breaker and an ETL certificate, which is the minimum paperwork a careful buyer should look for. It is built around the same idea as the Kohree: a single protected 15 amp circuit moved from the utility to the generator by a manual action.

Where it trails is finish and feedback. You do not get the status lamp the Kohree offers, and the lid and gasket are plainer, so I would place it under an eave rather than in full rain exposure. If your outage plan is a furnace and nothing else, that compromise is reasonable and the savings are real.

Over the years the failure points are the same on any budget box: a sun-baked cord, a loose neutral lug and a breaker that nobody exercises. Flip the breaker a few times at the start of each heating season, and write the covered circuit on the cover so a family member can run it without calling you.

The Afurkuot lists a pre-drilled power inlet box with a circuit breaker, which means the knockouts and mounting holes are ready before you pick up a drill. That sounds trivial until you try to drill a clean hole in a plastic enclosure on a ladder with a gloved hand.

It ranks in the middle on price among the 15 amp boxes and sits close to the Kohree in function. Compared with the BOYISEN, the difference comes down to labeling and the quality of the strain relief, so read the instruction sheet before you buy and confirm the box includes the 5-15P inlet and a breaker rated at 15 amps.

Long term, the box needs the same care as every outdoor inlet: seal the conduit entry with a proper fitting, keep the cap closed, and replace any cracked gasket before the next storm season. If you mount it low, use a bracket so it does not sit in splashback from the roof.

The BOYISEN emphasizes its waterproof enclosure, with a 5-15P inlet and a breaker in a pre-drilled case. If the inlet will live on an exposed exterior wall, a lid that actually seals is worth more than another feature, because water in an inlet is how most of these boxes die.

It sits in the upper-middle price tier here, above the RVMATE and well below the 4 circuit Nature's Generator. You pay slightly more for the enclosure, but you still get one 15 amp circuit, so do not mistake the better housing for more capacity.

On the maintenance side, a waterproof lid depends on its gasket. Inspect it each fall, clean grit from the sealing face, and avoid leaving the generator cord plugged in for weeks since that holds the lid open and defeats the seal.

Nature's Generator breaks from the single-circuit boxes by offering a four circuit manual switch rated at 15 amps. You wire four household circuits into it and flip each one over to the generator, so a furnace, a fridge, a few lights and an outlet can all ride through an outage together.

The catch is the same 15 amp ceiling, which is why the total load across all four circuits must stay inside what a small generator can carry. Against the Kohree box, the multi-circuit panel is more flexible but needs more wiring, more labor and nearly always an electrician. It also ranks at the highest price tier in this lineup.

Expect more ownership paperwork: a written load list, labeled circuit breakers and a yearly exercise of every switch. If that sounds like too much, the single-circuit boxes are a better match.

This is the only automatic unit in the lineup: it senses loss of utility power and shifts a plug-in load to the generator input on its own. It uses 5-15 plug and receptacle ends, so a freezer or a modem can be plugged in without opening a panel.

The cautions matter. An automatic unit does not start your portable generator, so you still have to run it, and the listing is a generic electronics seller rather than a named electrical brand, so verify any safety marks before relying on it for a life-safety load. I would treat it as a convenience for low-risk loads, not a code-compliant house switch.

Ownership is easy because there is nothing to wire, but check the plug fit and amp rating of every cord you use with it. A 15 amp device with a 12 amp load is fine; a 15 amp load in a hot summer garage is not.