Choosing a transfer switch for backup power is really about how much control you want during an outage. A manual transfer switch puts you in charge: when the power goes out, you move the lever and choose which circuits your generator feeds. An automatic transfer switch is built to handle that switch for you. The four options here cover both approaches, with capacities from 20A to 50A.
Quick take The four switches split into a manual group and an automatic group. The automatic switch is the only automatic unit and has the lowest listed price, while the two 30A Reliance manuals share the same six-circuit design at different price levels. The VEVOR manual is the only 50A switch and has a NEMA 3R enclosure. Your main decision is automatic versus manual, and then how much capacity you need.
Listed price comparison
| Product | Listed price | Relative listing price |
|---|---|---|
| Automatic Transfer Switch 20A 120V ATS Generator Home Backup Power Switch | USD 89.99 | |
| Reliance 30Amp BackUp Power Manual Transfer Switch PreWired 6 Circuit Kit | USD 139.99 | |
| RELIANCE 30Amp BACKUP POWER MANUAL ProTran Transfer Switch Kit PreWired 6Circuit | USD 199.00 | |
| VEVOR Manual Transfer Switch 50A Generator Transfer Switch Kit NEMA 3R 12500W | USD 199.90 |
Decision matrix
| Use case | Recommended pick | Why it works |
|---|---|---|
| Automatic operation | Automatic Transfer Switch 20A 120V ATS Generator Home Backup Power Switch | Plug-in automatic switch rated at 20A / 120V / 2400W |
| 30A manual for six circuits | Reliance 30Amp BackUp Power Manual Transfer Switch PreWired 6 Circuit Kit | Prewired 30A manual switch for six circuits |
| 30A manual kit with inlet box and cord | RELIANCE 30Amp BACKUP POWER MANUAL ProTran Transfer Switch Kit PreWired 6Circuit | Includes a 30A inlet box and 10-foot cord |
| 50A manual with NEMA 3R | VEVOR Manual Transfer Switch 50A Generator Transfer Switch Kit NEMA 3R 12500W | 50A rating and NEMA 3R enclosure |
Product notes
Reliance 30Amp BackUp Power Manual Transfer Switch PreWired 6 Circuit Kit
This prewired 30A manual switch is designed for six circuits, so you can pick which parts of your home stay powered instead of running everything at once. The listed price is $139.99, which sits between the automatic unit and the two higher-priced manual kits in this set. The switch type is manual, so you'll be operating it yourself during an outage. The six-circuit limit means you'll need to decide ahead of time which circuits matter most. It is a new unit and carries model number 31406CRK. This is a straightforward 30A manual option if the six-circuit layout matches your backup needs.
RELIANCE 30Amp BACKUP POWER MANUAL ProTran Transfer Switch Kit PreWired 6Circuit
This second 30A manual kit also covers six circuits, but it carries a higher listed price of $199.00. It includes a 30A inlet box for outdoor installation and a 10-foot 30A cord to run between the generator and the inlet box, along with two watt meters for monitoring and balancing the generator load. If you want the manual transfer switch kit to come with those components bundled, this fits. The 30A and six-circuit footprint is the same as the lower-priced Reliance option, so your circuit budget doesn't change. The higher listed price goes with the additional components included in this kit.
VEVOR Manual Transfer Switch 50A Generator Transfer Switch Kit NEMA 3R 12500W
At $199.90, this manual switch has the highest listed price in the group. It is rated at 50A and carries a 12500W rating. The NEMA 3R-rated enclosure is made from cold-rolled steel, and the kit includes a pre-wired design with a power input box and double-throw switch. Since it's a manual switch, you'll be moving the lever yourself when the power goes out. The 50A capacity is the largest of these four switches, so it's the one to look at if you're running a larger generator.
Automatic Transfer Switch 20A 120V ATS Generator Home Backup Power Switch
If you want the switch to do the work, this 20A automatic transfer switch is listed at $89.99. It's rated for 20A at 120V, with a listed wattage of 2400W. It has a plug-in connector, a wall mount, a 2-way circuit type, and a toggle-style operation mode. Because it is automatic, it's designed to take the manual step out of switching during an outage. On the flip side, the 20A capacity is the smallest of the bunch, so you'll need to keep your connected load within that range. This is the pick for a smaller backup setup where automatic switching matters more than raw capacity.
Final recommendation If you want automatic operation, the 20A Automatic Transfer Switch is the one to start with. For a 30A manual switch with six circuits, the Reliance 31406CRK covers the basics; the ProTran version adds an inlet box and 10-foot cord if you want those components included. And if you need the largest capacity, the VEVOR 50A switch with its NEMA 3R enclosure is the one to consider.
