Best generator transfer switches (2026): manual kits, inlet boxes and cords

Generac's 30-amp HomeLink kit comes with an aluminum power inlet box, so your electrician wires the switch beside the panel and the inlet outside, and in an outage you plug the generator into the wall instead of running cords through a window. It ships set up for 8 circuits and expands to 10. A push-button rocker moves the chosen circuits from utility to generator, and status lights show which power you're on. Generac also sells a HomeLink upgrade kit that converts it to automatic standby later.

Best for A 30-amp switch with an inlet box, from a big-name maker

• Power inlet box included
• Status lights for utility and generator power
• Upgradeable to automatic with a HomeLink upgrade kit

• 8 circuits as shipped (10 with expansion)
• 30 amps: for generators up to 7,500 watts

Who shouldn't buy it: Don't buy it if your generator has a 50-amp outlet and you want to use all of it: the HomeLink 50-amp kit handles up to 12,000 watts.

Everything in one box: a 10-circuit, 30-amp switch, a rainproof inlet box, liquid-tight conduit and a 50-foot generator cord, which lets the generator sit well away from the house. The listing says it's ETL-listed and UL 1008-compliant, and its double-throw rocker switches stop the generator feeding back into the grid. The steel enclosure is rated for outdoor use, which helps if your panel is outside.

Best for The most complete 30-amp kit: switch, inlet box and a 50-foot cord

• Inlet box and 50 ft cord in the box
• 10 circuits
• Steel enclosure rated for outdoor use

• 30 amps: for generators up to 7,500 watts
• Sold by Connecticut Electric through Amazon, not by Amazon itself

Who shouldn't buy it: Don't buy it if you need more than 30 amps: the Generac HomeLink 50-amp kit handles up to 12,000 watts.

For the big home-backup portables, 9,500 running watts and up, a 30-amp switch leaves power unused. Generac's 50-amp HomeLink kit handles up to 12,000 watts across 10 circuits at 120/240 volts, and its listing names well pumps and electric water heaters among the 240-volt loads it suits. A mechanical interlock means the utility and generator contacts can't close at the same time, and the kit includes an outdoor-rated power inlet box.

Best for Big portable generators with a 50-amp outlet

• 50 amps, up to 12,000 watts
• 10 circuits at 120/240 volts
• Mechanical interlock; outdoor inlet box included

• Overkill for a generator with only a 30-amp outlet
• Indoor panel: mounts beside the main breaker box

Who shouldn't buy it: Don't buy it if your generator's biggest outlet is 30 amps: the 30-amp HomeLink kit matches it.

The outdoor half of a transfer switch setup: a rain-tight, rust-proof steel box with an L14-30 inlet, wired by your electrician to the transfer switch inside. In an outage you run one 30-amp cord from the generator to the box, and no cords come through a window or door. It's rated for generators up to 7,500 running watts and is made to pair with Reliance switches.

Best for Plugging the generator into the outside wall

• Rain-tight, rust-proof steel
• L14-30 inlet: matches a generator's 30-amp twist-lock outlet
• Sold by Amazon

• Needs a transfer switch and a cord as well
• 30 amps only

Who shouldn't buy it: Don't buy it if your transfer switch kit already includes an inlet box, as the Generac and Connecticut Electric kits do.

The cord between the generator's 30-amp twist-lock outlet and your inlet box: 20 feet of 10-gauge, four-wire cord with molded L14-30 ends, UL listed, with a five-year warranty. Twenty feet is the minimum distance the CDC gives between a generator and any window, door or vent, so if your inlet box sits close to a doorway, a longer cord lets the generator stand farther out.

Best for Connecting the generator to an inlet box or switch

• 10-gauge, four-wire, L14-30 both ends
• UL listed
• 5-year warranty

• 20 ft: a longer cord may suit your yard
• Sold by Northern Tool through Amazon

Who shouldn't buy it: Don't buy it if your kit includes a cord already, as the Connecticut Electric EmerGen kit does.

Reliance's 10-circuit kit mounts beside the panel and lets you pick up to 10 circuits to run from a generator of up to 7,500 watts. Its listing says it works with GFCI and AFCI breakers, which newer homes use on many circuits. The listing doesn't spell out what's in the kit beyond the switch, so check it with your electrician before ordering.

Best for Ten circuits, and it takes GFCI and AFCI breakers

• 10 circuits
• Works with GFCI and AFCI breakers (listing)
• Mounts beside the panel

• The listing doesn't detail the kit contents
• Sold by Northern Tool through Amazon

Who shouldn't buy it: Don't buy it if you want the inlet box and cord in the same box: the Connecticut Electric EmerGen kit includes both.

The six-circuit Pro/Tran 2: enough for a fridge, a furnace, a well pump on one 240-volt circuit, and lights, which is what most outages call for. It comes pre-wired, installs beside your existing panel and suits generators of up to 7,500 watts. If you think you'll want more circuits later, look at the 10-circuit 310CRK instead.

Best for Six circuits: enough for the essentials

• Pre-wired
• Takes a 240-volt circuit plus four 120-volt ones
• Suits generators to 7,500 watts

• 6 circuits only
• Sold by MaxTool through Amazon, a few in stock

Who shouldn't buy it: Don't buy it if you want to power more than the essentials: pick a 10-circuit switch.